The Yamaha Yz 490 is FIXED!!! (INSANELY FAST)

[@FadedbyJay]

Anyone wanna take bets that it still doesn't run right.....

[@callmedaddy6988]

Buddy id bet my soul it doesn’t run right😂

[@crystalstanborough4053]

not sure but, if he turned it more than a quarter open, the throttle.... she might xlean out, open rite up....

[@johnmack5973]

This dude does not know how to ride i hade the same bike and it was nasty would stand up in any gear

[@mlr06121974]

😆😆😆😆 He hasn’t the slightest clue

[@tommybiggers8496]

@@crystalstanborough4053 😆

[@Pint76]

Go watch Kaplan Cycles on KZbin and you’ll see how a big bore two stroke should be running.

[@robpearson1209]

These boys don't have a clue of what big bore power is!! Lol!! 2 things are gonna happen... There either gonna get tired an sale it off as a disappointment... Or there going to get it fixed an we'll see there obituary in the paper!! But ya gotta give em an A for effort... They haven't gave up yet... Lol!! I just hope they get this ole gal fixed right before they destroy it! People on here are trying to tell em... But they won't listen.... You see the vid of Jr's new bike build? They sent it to AJ Waggoner an Adam Muellar... An kens bike build is going to be an absolute beast when it's done..lol!!

[@lucadonorio1815]

@@robpearson1209 Kaplan American really knows his way around bikes this thing sounds like shit compared to the 490’s he’s had come through his shop. The wizard really knows how to jet I aspire to be able feel a bike and jet it like him

[@robpearson1209]

@@lucadonorio1815 yes sir, Kenny an Jr an wizard... They all have raced for years... An Ken an wizard raced the pro AMA for a long while an Ken rode for husqvarna for a good while... They dump so much knowledge an wisdom into some of there vids ya gotta watch em 2 or 3 times to get it all.... They truly are a blessing! An I can't wait till I can go up an visit them an see the museum...

[@lucadonorio1815]

@@robpearson1209 lol I’m up in Canada and I’m a bit too young but once I grow up a bit older I really would love to go see their amazing cr500’s and other vintage motocross bikes in showroom condition

[@theboogieman401]

He knows trust me .

[@rigguyjt]

Clutch is slipping Joe. I don't know if you can tell but it sounds like you're in the same gear every time you shift. I don't like to be negative just try to help you. If it was running right, I guarantee you would not be able to open it up like that. Every gear you should be on your back wheel. Re jet it and try again.

[@AntiPlatitude]

^ This.

[@TheCraigy83]

I agree , look at the wear on that front sprocket , someones done a lot of miles on this

[@davidbjorkholm310]

You should’ve changed the air filter and the spark plug since that’s the simple stuff, maybe it could help

[@BaltaM4ster]

it realy does

[@twixy6251]

Hej är du svensk?

[@davidbjorkholm310]

@@twixy6251 aa vadårå?

[@NickKautz]

Clutch is slipping crazy bad.

[@raidenshields4829]

Oh my God that YZ 490 is so off. Not even close to running the way it should. That bike needs a new top end for sure. This bike is on its way to blowing up soon that's why the guy sold the bike so cheap. Someone please rescue this classic before Charlie blows it up.

[@cablelag]

Something is still off. My YZ490 could rip a wheelie in 3rd with minimal effort and the throttle response was amazing. Sounds like u need a carb rebuild because this thing is still boggin.

[@davidbjorkholm310]

Kīehl Turon these bikes are supposed to be super crisp and throw you off when you get on the throttle but this bike won’t lift the front tire

[@cablelag]

Exactly, I was scared of that thing. In 2nd it could do something like 45mph+ in an instant. I'm guessing Carb or needs to be rejetted. It's not smoking as bad anymore but he prolly fouled the sparkplug bogging it like that. Keep at it! Once it's fixed you'll sell it because it's insane. :)

[@davidbjorkholm310]

Kīehl Turon most bikes that bogs usually clears out and start screaming but this bike bogs for 10 minutes full throttle

[@brandonbarthel8377]

Yeah, front tire should stay in the air if you have traction!!

[@mikecheeze4312]

His clutch is slipping.... that's why

[@jake-zi4px]

This is terrible. Watching you hold the throttle all the way open and not even get a small wheelie killed me. You got a lot more tuning to do boss, thats like a 1/4 of a 490s power.

[@Neptonic101]

so true, more like 1/8 of the power.

[@davidbjorkholm310]

Saying that it’s fixed even though it bogs just as much, thing should rip his arms off

[@lex1945]

even a yz80 will wheelie on asphalt if you hammer it down. This 490 doesn't, so it's not running as it should. Normally this yz490 would throw him off in an instant with his riding skills.

[@Neptonic101]

Alex Postma so true

[@carterlyons4026]

My dad used to have one and he could pull a power wheelie in every gear

[@HUSKY7-1]

For the love of all things Moto, someone please rescue this poor bike.....

[@smallenginekid6252]

Husky 701 there’s nothing wrong?

[@spreaddeezhazelnutz7511]

Husky 701 I know. It sounds like shit too. That thing needs more than TLC, it needs a freaking therapy session. lol

[@connorphillips7071]

This is why we can’t let retards have 2 strokes lol

[@jimmadonna1436]

@@connorphillips7071 😆

[@noodlezslipbizkit]

Thing runs like fuckin shit Hahahaha

[@TNTMOTO]

Pretty dang close on the jetting? Your running a 40 pilot when stock calls for 50. That is a 20% difference. That is not close. The only reason it runs slightly better on the bottom end is because you leaned your premix to 40:1 allowing more fuel to get through the jets, but you now have less lube in the gas for that massive piston and bearings .That is a bad idea. You will cook that motor. This bike was probably set up for higher altitudes. Put stock size jets back in it, go with 32:1, 3rd clip on the needle. and ultrasonically clean your carb.

[@chriscrezz1312]

And dropping the fecking throttle slider on the floor wont have done the needle much good. Think he should get a stock jet kit to start with.

[@gtisid]

amen to that, he’ll know when it’s right i fear

[@kyoakland]

Maybe it's good that the bike is not running right the kid might kill himself doesn't seem very experienced

[@joenobody2580]

💯 agree. Also screw a psi gauge in the spark plug hole and check compression. Less oil in the premix is never better. I always drilled the case hole bigger in the main bearings to get more premix in.

[@AnDrEw122100]

Guy gets a lot of potentially nice bikes , but he is such a moron . It’s painful to watch but I like to read the comments 😂

[@baikal4784]

This tool is a next level hack.... So embarrassing to watch... He should just stick to his mopeds...

[@jaypearce6199]

Have you checked the exhaust isnt full off gunk and crap after 30 odd years, also repack the rear silencer... and check the float height is set correctly this make a huge difference as ive just found out on my 2017 ktm exc 250

[@downsouth701]

Everything u ride is so said scary fast. I haven't heard the powerband open up once. Stick to ur mopeds

[@jimmadonna1436]

LOL!

[@himvlogs1302]

😂💯💯

[@Nfl..prodzz]

Ya I noticed that🤪

[@tylerrhodes2192]

He needs to stick to a bicycle

[@danuw3lls]

Yeah sounds like it's about to hit the power band

[@andysparks8245]

As someone who remembers the YZ from the 80s... you're nowhere near fixed, the whole YZ range was fierce and the 490 was only for those skilled and experienced riders who could tame it, if you're calling that "insanely fast" then lord help you if you get it running correctly!

[@jimmadonna1436]

If he gets it running close to right, it will rip his arms out of the sockets!

[@kxp.1496]

If he gets it running right he will be too scared to get back on it

[@shawnmosleh2363]

Exactly

[@CoralReefkid]

My 450 would probably smoke it like snoop dog with his joint, you understand?

[@mart1414]

@@CoralReefkidshut up

[@stuartparkes8539]

I had the 87 490 it was rapid they called it the widow maker back in the day

[@aaronrmz2502]

The old Kawasaki h2 was called the "window maker" not a yz490.

[@jake-zi4px]

@@aaronrmz2502 they both were lmao

[@briankennedy5578]

That tree branch hanging 60 feet over your front door is called a widow maker too. 2 stroke KZ 750 is a wild ride. But so is a 2 stroke open class motocross bike. And a YZ490 with yamahop. I sat they both earned the name widow maker

[@sambethtransport5763]

Had one. I'm 70 kg, back wheel every gear. Couldn't keep front wheel on the deck. learn to ride it bro coz it's guna bite you.

[@markusb8438]

WD 40 soaks into brake pads and ruins them

[@b3rscher582]

It was a fucking Joke!

[@kingyschannel3221]

No it doesn’t dirt bike break pads are meant to be fucked with shit

[@codenamenoob4973]

@@kingyschannel3221 dirt and water yes, oils and penetrants no

[@malky525]

Dosent matter. He's a back brake only beginner.

[@mikecheeze4312]

@@kingyschannel3221 go spray your front and back brakes with wd40 and go ripping straight for a wall. Slam.onnthe brakes and tell me what happens.....6 months later.... or maybe your parents will.... idiots like you is what get people hurt. Throwing out dumbass advice with absolutely no inclination of wtf your talking about. Stick to a shoes man. Least you can wd40 them 🤣🤣🤣🤣

[@davidbjorkholm310]

Is it actually fixed or is that something only you would say?

[@saavi4739]

@@markcollins5026 so much

[@chriscrezz1312]

Air and fuel mixture screw dude🤘

[@JourdonGulick]

Roasted

[@Neptonic101]

He doesn’t know how to fix anything

[@atribecalledcookies6thru284]

@@Neptonic101 you have to learn some way, you aren't born with this shit , give him 10 more years and I bet he's in a shop or owning one.

[@clayoosting6925]

I still don’t understand the thinking behind spraying the brake rotors with wd40

[@savvasstergos7175]

it was a joke, he probably put brake cleaner in the bottle

[@motoguy1587]

@KGB 1974 so true 😂

[@JD-mj6wj]

@@savvasstergos7175 how the fuck do you put break cleaner in a sealed spray can bottle... are you completely fucked in the head??

[@JD-mj6wj]

@Badass Skeptic me as well

[@stovenhd9665]

Are you dumb. It says it's a joke after he does it.

[@Rickthefirst]

That front wheel would be constantly in the air if that was running right

[@Mr549er]

yep not runing right boys my ear says lean keep at it yull get it right road the first gen back in the 80s great engine

[@jaredc4303]

That bike is not fixed, it clearly is not hitting the power band. Why throw up click bait titles for this? Just spend some more time actually fixing it before posting a video.

[@Anonymous-vu8nc]

scrubi lol you call someone a retard and you can’t even type using proper grammar ...

[@eddean5090]

@@gabewickwicki9773 engine breaking doesn't hurt 2 stroke's motor's please stop spreading that bullshit

[@David-my2tv]

@@eddean5090 It does. The oil is mixed in petrol, when you close the throttle engine is getting same amount of lubrication as it does on idle. It's okay if you engine brake for a while like before corner but after the thin layer of oil on cylinder walls gets scrubed off it's just metal on metal and this leads to locking your engine. (Sorry for my english)

[@kyoakland]

Amen

[@Anonymous-vu8nc]

Nathan Gregory oh yeah I forgot everyone’s meant to say “laugh out loud instead” 😂🤦‍♂️🤦‍♂️

[@LG-fb9yt]

Bought a new 92 wr 500.. told to mix 20 to 1 for couple tanks for break in.. then rejet and lean it out. But..i realized when I was ripping on it proper..it did not smoke a bit ..continued to run it that rich and NEVER fouled or changed the plug in over 3 years! Had someone that raced them try it out and give me his thoughts..he said " DONT CHANGE A THING! IT RUNS AWESOME!" ...if I was babying it.. and it started loading up..all I had to do was go through the gears hard one time and it was burning clean by the time I reached 5th gear! LOVED THAT WIDOW MAKER! ...it trumped the cr 500 pro circuit bike I tried.. only thing that seemed close to it power to weight ratio was a husquvarna 360 that was stupid fast just like it! ...oh..i ran PUMP GAS even.. couldn't get 95.. 93 was best I could find.. but never had issues even on 87...😎

[@its2stroke]

40:1? Won't be long before this one blows up.

[@blownbudgethondas1086]

Manual probably says 20:1

[@fatboyracing2508]

Its2stroke ha I mix my cr125 with 50:1 on race fuel

[@blownbudgethondas1086]

@Holden Davis that's fine if it's jetted right different mixs require different jetting he got that bike jetted for 20:1 and he's putting 40:1 in it so it will runs super rich also air cooled engines need abit more oil for cooling purposes

[@its2stroke]

@Holden Davis No I'm not dumb. I understand that less oil equals a faster bike, but running 40:1 will result in a blown engine. If your 2stroke is not smoking, you're asking for trouble.

[@2DclanSnipingTeam]

That bike called for 24:1, per the owners manual.

[@jimmadonna1436]

I remember meeting a guy at AMA DISTRICT6 hare scrambles races....he had an 87 YZ 490.It was immaculate, I looked at it for a long time. He was happy with me because when I look at people's stuff I put my hands behind my back. I look at his carb it said BING 55. WE STARTED talking. I asked him Y BING he said that there where no more detention noises. He asked me if I wanted to RIDE it... I told him I'd love to after the race. His bike had a mechanical failure and it was on the back of his RV So I meat up with him months later I asked him if his offer still stood he said "GO FOR IT. Wow I was impressed by the sheer power it had. I'm 215 lbs that thing did a 3 rd gear wheelie like so easy. SICK!!

[@scottmeyer3803]

Thing almost sounds like a trashy snowmobile that barely wants to live

[@MikeSmith-ve2qu]

I had a 82 CR480 ported when I was 15 that bike scared me left side kick these air cooled bikes are hard hitting.

[@trxtrailblazer7643]

Ain’t no way problem fixed, sounds like my pw 80

[@michaeldegovanni5644]

RuthlessOffroad this dude is a joke! It’s almost funny

[@gtisid]

i would definitely be having that exhaust off clean it and the air filter. lay the bike on its side and adjust the clutch internally if the friction plates have any life in them. it will only improve it. it should be throwing you off the back when you open it up! blip the throttle in any gear that front wheel should be lifting.

[@briankennedy5578]

I'll give you a bit of advice. Take it or leave it . You'd be wise to take it. Any time you assemble a 2 stroke engine. And one that has been sitting for a while. Or an unknown that may have been inproperly worked on, needs to have a leak down test. It is very important that you have no leaks anywhere between carb and cylinder. That's the intake, reed block, crank seals, head, canister, etc. If you do have a leak, you will be tearing it down. Leak equals lean. And lean melts Pistons , rings , and basically burns your shit up. It's easy to check. And definitely worth doing. You can buy a tester rather cheap. Or it's not hard to make one. You block the exhaust port and the intake and pressurize it with about 5 psi. Don't want much more pressure than that or you will create problems. If you can hold 5psi. for about 5 min. Then you are good to go and can get back to oiling your brakes.

[@rwbz28]

BwaHHhaaaaa! Oil them brakes boy!

[@WhiteTriForce]

The first bike i ever learn to ride on was a Yamaha DT 400 ! 🤔 one day kick-starting it, The back compression threw me over the handlebars and I had a welt on the bottom of my foot from the kickstarter ! 💥😯 My foot hurt like hell for about a week, but it would have been worse if I was on the blacktop ! A lesson learned ! 🙈🙊

[@HUSKY7-1]

Helmet, T-shirt, shorts, one sneaker, one boot. Who could have predicted that? Safety first kids...

[@matthewturowski8281]

I had an 84 YZ 490. Up to 84, the plastics on the bikes were yellow, after that they were white. Mine was always hard to start on the first ride of the day, after that it usually fired right up. Always start it with a riding boot if you value your ankles. Some folks use the tip of leaning the bike to the left until some gas dribbles out the overflow tube and then try to start it. I don't remember what my jetting was because I sold the bike 10 years ago. I do remember that the bikes were hard to keep jetted properly. Properly running or as close you can get it, it will be a monster and literally rip your arms off. I still think you have to work on your jetting, 1/3 to mid range seems rich. Play with the clip position on the needle. You do not need to let it idle to warm up for 5 minutes before riding. Fire it up, warm it up slowly for a minute with some revs on the throttle and then ride "reasonable" for the first couple of minutes then have at it.

[@thrasher2094]

Sounds like the jetting might still be off. I know the old fin head 2 strokes dont rev as crisp as the newer ones do but it should ride better than that in my opinion.

[@briankennedy5578]

Not true. Water or air cooled, they still are 2 stroke

[@CoralReefkid]

No this bike had always been a pain. I havcc rev yet to see one faster than my 450

[@tomnekuda3818]

I rode a YZ465 for several years.....the best thing I did for it was to take off the Mikuni and put on a 38 mm Kehin from a 480 CR Honda.....whadda difference! Very easy to tune and cleaned up the bottom end nicely.....power everywhere.

[@UlisesGlez26]

Sound better but it still needs some tuning, please change the spark plug and change your transmission oil & adjust your clutch, believe me it will make a ton of difference

[@2strokesmoke857]

Ulises Glez as nothing two do with the Moter running like a piece of shit

[@sirexobee21]

Don’t sweat the negative comments my friend. I love seeing young guys learning about mechanics and getting out of the living room off the video games and getting dirty and teaching themselves something new. You have a good start. You did mention you knew the clutch was slipping and you knew it was bogging so you have a good start. Definitely dial your jetting in better so that the engine will get in the meat of the power band. You definitely aren’t getting peak horsepower but it seems u r making progress and on your way. Keep sharing as we enjoy it and you may just inspire some young video game jockeys to follow in your footsteps. I’ve been a tech in the power sports industry for 20 years and it’s very rewarding even still.🙂

[@jritchiejritchie2687]

4:30... D'oh. 😂😂😂 O man you haven't got a clue

[@coletrick8748]

This bike is clearly not running right. You don’t need to “clear out” the carb by running it if you just cleaned the carb. That’s what cleaning the carb does. If the carb is clean then you should play with the air/fuel screw to tune it.

[@Hanky_Bannist8r]

I can hear it winding out pretty quick. I'd definitely pull the clutch cover and check the discs. Clean them up, let them dry and lightly scuff them with Emery cloth before you put them in new oil. That bike should be legit scary.

[@CoralReefkid]

You old goofs haha, my new 450 with quickshifter would embarrass this bike

[@mart1414]

@@CoralReefkidDidn't ask

[@CoralReefkid]

@@mart1414 you’re getting it anyways, could give a fuck if you requested it or not do you understand?

[@woodb69n]

I have had many of the 490s from 82 to 87. This bike has several issues. 1) loading up bcuz piston to cyl clearance to much 2) exhaust leak (impossible to tune correct until fixed) 3) needs reeds 4) clutch bad 5) should be running 100 octane leaded race gas (sunoco) Personal preference-I like to use a flat slide mikuni..these engines with no power valve like other makes have are hard to jet for full rpm range. Some mod to the squish area in the head helps considerably. (((6)))) This bike when running correctly will smash this kid, for real. The torque is monster & he would never ride it on his moms lawn cuz they DIG with every twist & he'd be on his back with it on top. It is very clean for its age but was owned by someone who didn't understand it is all

[@travisshipp3009]

Bruh whenever state he’s in needs to ban him from buy anything with a motor🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️

[@kyoakland]

Lmao

[@rufusjones1405]

Once you have it all dialed in hang on, you will have the funnest ride ever. I have a old IT 425 so much fun and what a monster. Rode with kx 500 and cr 500 and rode circles around them.

[@jamesamsler2418]

No ambulance...not running right!!!

[@Donny_Buysall]

When kicking over a big bore 2 stroke you can make your life alot easier but getting the piston to TDC then pushing just past it. It will kick smooth as a dream and never kick back on you (provided everything is working properly). Just a tip, it actually makes kicking any bike that has a lot of compression MUCH easier.

[@kamtroy2527]

Should change all fluids when you get a used bike. You got that bike for a deal cause it needs a new top end.

[@trevorjameson3213]

If there is no crankcase air leak (if so, replace crankcase gaskets, very important on a two-stroke, it will never run right if they are leaking), Then: 1. New set of rings, and check/replace piston and check bore, 2. New spark plug, 3. Clean and jet carb, 4. New air filter, 5. Fresh fuel, 6. New Clutch plates, 7. Check and/or replace intake reeds, 8. Remove dents from expansion chamber/pipe so the resonance will work properly again. And 9. Never let it idle for long periods unless you want to foul the plug. Warm it up by riding it gently for a few minutes only. Then rip into it. Do all of that, and the YZ490 will run correctly. That bike should require very little throttle at low rpm to accelerate strongly and smoothly. Wide open throttle even in high gear should just about yank your arms free of the bars. At least that's how my KX500 is, I would assume the YZ490 is very similar in power, if not more so.

[@roymartin4771]

its still boggin,my old yz 465 would lift in 4th with me layin on the tank. keep workin on it.

[@stevestewart6287]

My old 1982 Suzuki RM465 would lift the front wheel in every gear but 5th, with me laying on the gas tank and my chin over the handlebars, and I weighed 230 lbs.

[@bradmonrean2307]

I had a 1987 YZ 490, in 1990, when I was 20 yrs old. The thing would pull the front wheel in 5th gear, below approx. 60 mph, by rolling the throttle- - - - no clutching required. Wish I had it back!

[@lancekippenbrock5307]

You were actually a good rider and doing good wheelies you would know how important brakes are

[@brantmcfarland517]

Oh wow had one of them too. Got it new in 84. I loved the hell out of mine. Very fast. Raced it in the open class in 84 to 86.

[@capsitan]

Is it me or does this bike still not sound right?

[@johngaulding3710]

Had one a long time ago. Change the fast jet, idle jet sounds good. But it does seem to not shit gears. Dry clutches. As compression drops you need a smaller jet. Hope this helps

[@foreverhungry84]

its still not right, it sounds choked. 2 stokes should sound crisp and zingy. please invest in an ultrasonic cleaner for the carbs.

[@andrewb232]

foreverhungry84 the yz490 is supposed to sound like a chainsaw he just needs to run it some more and it’ll be fine

[@nolimit3663]

She is coming back to life .👊💪👍

[@jeffferguson899]

I can tell you will certainty that that bike is not running well. I had an IT490 (pretty much the same bike ) and it should lift the front wheel in 4th gear without even trying. They are a rocket ship when they are in tune . your bike sounds like it is clapped. Not trying to be an ass but it is not even close to being in tune

[@rigguyjt]

You should have gone with your first instinct. If your not sure about jetting, start stock jets stay 32:1 stock needle position and do your plug chops steps the right way. Make sure your float is adjusted right because tuning starts there. If it's off, it's all off.

[@rigguyjt]

...and you have to have 2 or 3 new spark plugs around for plug chops. I know it's a hastle but it's the correct way.

[@rigguyjt]

My IT250 will wheelie easy in fifth gear and I'm not a small man. I'm used to going through the process so I pretty much get it by sight and sound these days. Watch my videos.

[@chocoman6385]

Next video "we sold the beast"

[@notjoecheez1]

Still sounds loaded up to me. I would put stock jets in. Needle clip on second position and two turns out on air mixture screw. Then ride it a bunch.

[@antoniomendoza6140]

“ still runs boggy ” * I let it warm up for 6 minutes *

[@stevestewart6287]

That's the problem, you can not let a big bore 2 stroke idle for 6 minutes after a cold start up, all it does is load up the engine so bad it does not want to clear out. I had a Suzuki RM465 for 8 years and mine never ran like this YZ490, because I never let it idle for 6 minutes after a cold start up. I started it and got on it and gave it full throttle for a minute or two and it was cleared out and running perfect, with instant throttle response that would rip your hands off the grips at 3/4 throttle. this kid does not have a clue what he is doing with this YZ490.

[@madjack1748]

My uncle bought one of those brand new in the 80's. He said it was the craziest ride ever.

[@mattymoto8895]

I have never known a person with a yz490 who hasn’t snapped the back guard and that wasn’t even lifting the front wheel there’s definitely something wrong with it

[@cabester77]

I had an 82 yz 250, sounded exactly like this, turned out it was the magneto stator coils breaking down. Bought new ones from Yamaha, Transformed the bike...amazing after that... Try measuring the stator coils on your bike, see if they are within spec...

[@thatonerepairguy4784]

How do we get a hold of your father so he can take your tools away I mean seriously that thing is sick not as in awesome sick but like it needs chemo

[@coletrick8748]

I wonder if he really believes it’s running good or he’s just saying that so when he sells it he can say it runs good..

[@thatonerepairguy4784]

Cole Trick i don’t think the kid would know a good running bike if he saw one when he got That 92 rm125 he said it wheelies in every gear but yet it’s a rid

[@michaelstrauss8349]

So many negative comments. Why doesn't everyone use their extra energy to help this guy? Tuning a 2 Stroke Dirtbike is not a difficult thing. 1st Air leaks kill you. In his case the bike is never leaning out so I doubt he has an air leak anywhere. He needs to start with the air screw and the pilot. Idle to 1/4 throttle is going to be air screw and pilot. Transition for 1/4 throttle to 3/4 throttle is the needle taper and the position of the clip. 3/4 to wide open is the main jet. In this particular case I would get it warmed up and check the idle circuit first. If he has an imbalance in the air screw and idle he could be loading it up before he even whacks the throttle. Rarely do you need to change the needle and clip unless you have a pipe, porting done, or some other mods. It never screams when he opens it up so I would say his main could be changed out for a smaller one. He can also do a plug check by putting in a new plug, taking it on some hot laps, point the bike toward the house, wind it UP, pull in the clutch, then kill the motor. Roll it into the garage, pull the plug, and do a reading? Is it black on the tip, is it black down low on the resistor, is it white ( in this case no LOL). I agree that if he has that throttle open that bike should be standing on the rear tire. A big bore 2 stroke is no joke. I own an 88 CR500 and a 90 KX500. Ride Safe and have fun !

[@quadvlog]

Next video: 490 yamaha 2 stroke RAW

[@anthonym2277]

I just rebuilt the same bike, it wheelies in every gear and has close to 60hp, that's running at less than half of what it's capable of doing

[@nasty2ndgenneon]

hurts my heart seeing you run these bikes like this.....

[@zx6picardi]

I genuinely cracked the hell up with the follow up on the wd40... Good work on saying F the comments

[@unclequack5445]

You call that insanely, crazy fast? it never stopped bogging out all the way.

[@shaunrunyon7372]

Love your videos can’t wait to see your next one I have a 1984 Honda XL 200r and my clutch is slipping as well and I’m not sure what anything looks like inside of there haven’t done a dirt bike clutch yet hoping I can get some pointers from you on the next video thx for the content have a good one

[@oz2strokeman116]

Shaun get a workshop manual, a person new to all this wouldn't realise the difference between good advice and bad. These clowns have no idea. A Honda manual will be available for your bike and it will be right. Just read it and it will explain how to do the job. Everyone can be an expert on KZbin if they say they are, even if they have no idea.

[@shaunrunyon7372]

Oz 2strokeman 1 yes sir appreciate it

[@djnormalnorman6590]

Wd on brakes.shorts on.no gloves.on tarmac.its like the beginning of casualty

[@Coal-Creek-Rider]

I raced a 83' 490 and ran my pre-mix at 32:1 - Bel-Ray and pump gas. gear it a tooth taller on the Counter sprocket to smooth out the torquey hit.

[@paulcondie2520]

Still not running righ, or the front end wouldn't be on the ground!

[@gogogeedus]

there's 5 minutes I will never get back.

[@philsuprenant7894]

It’s sounds loggie when you crack the throttle you should be doing wheel stands with that bike wheelies LOL.. running 50 to1 mix if it was hitting the power band it should be doing rooster tails in the grass

[@lancejewell1883]

I also put a 1mm big bore kit in mine. It's now a true 500çc. It will scare you. I have a 50 pilot and 430 main, 3rd clip position from top. At sea level. I clocked it at 95 mph.

[@4strokes4hayes63]

My friends Yamaha blaster has the same problem so we put a new spark plug and it ran 10x better

[@mdavis8430]

What you should consider is installing crankshaft seals to prevent air from leaking into combustion area.

[@benhowe5506]

That is definitely 100% not running crisp at all. If it was you would of shit your pants.

[@endurotruckererniedesjardins]

That 85 yz490 was made to run at 20 to 1 mixture. The leanest I'd go is 32 to 1 mix. More oil means higher compression rates and less likely to ping from today's shitty gas. When this bike was new we still had some lead in our gas. The yz490 has alot of history of lean out and blowing up. This bike clearly is jetted really bad. In 39 years of racing 2 strokes I've seen and rode a few yz490s.

[@coltonthompson1844]

Dude you didn’t grease your caliper enough

[@callmedaddy6988]

Colton Thompson exactly man. i was hoping for a wreck honestly😂😂

[@spreaddeezhazelnutz7511]

CallMeDaddy 69 Your profile pic and name made me cry tears of laughter. It’s fucking great. 😂

[@callmedaddy6988]

PC Master Race Thats why i did it lmao! Ive always tried to make peoples day with it and im glad to know i made your! Lmao it makes me laugh alot aswell.

[@spreaddeezhazelnutz7511]

CallMeDaddy 69 Nearly pissed myself.

[@iancuevas9922]

Coming along grate buddy keep it up love it

[@Nfl..prodzz]

That things running so bad! It sounds like a four stroke!

[@RcOffroad9513]

Damn that is a big carb slide! I have only watched people drive these big bikes, now that I'm older, and not an idiot anymore... well, not as much as I was when I was young, lol but I really wanna ride one now!

[@maxdamron4020]

Sounds like the clutch is mega slipping. Should have way more power too. No it’s not fixed. That’s what happens when u buy cheap bikes, just like the CR500.

[@MM-ig1iv]

Love them old 80's style bikes..

[@tommy3v625]

You’ll never understand the true meaning of “insanely fast” until you grab second on an 87 CR500 buddy

[@CoralReefkid]

Nope, hop on my pro circuit 450 that bitch does 114 mph it would convert you to Christianity.

[@davidbrilmyer2354]

Love it bro all the way from Hobart Indiana!!..

[@luckyshwarmplays4202]

The bike has a exhaust leak you can see it

[@magee16749]

Any older 2 stroke is gonna need opened up to clear the bogging after idling 6 mins. Just take it up road and wind it out without all the short shifting crap. Let it wind out

[@isaacblagden3510]

its clapped

[@loadthebowl]

Whats new

[@Macks_100]

Good to see you've made some improvements to it (you've noticed a difference, so somethings better), though like a few have mentioned, it might be wise to just check/touch up a few more things as it's still boggy; Give the spark plug a look, is it a nice tan colour? Change the filter for a new one for sure, fuel etc. It might be wise to take the head off just to see how the piston's doing as well as how the head/base gaskets are looking. Keep tinkering with it, will be a monster once there fully!

[@matthewdickey5248]

“Minty” 😂

[@michaeldegovanni5644]

matthew dickey lmfao!!!!... this dude plays with himself

[@punkin7144]

Need new fiber clutch plates. There should be a plate minimum thickness measurement in your manual or they could possibly be glazed over. I agree it is slipping, it should have been lifting the front wheel when you were getting on the gas on pavement.

[@N8outdoors]

Wont even wheelie if you clutch up it. No where close to fixed

[@lex1945]

wel, you heard the man.... 'it is getting crispier and crispier' LMFAO! What a tool he is..

[@jonmccormick8683]

The YZ490 being air cooled was not competitive with the CR500 (water-cooled) or KX500 (water cooled and power valved) unless your name was Broc or RJ. They did have a YZ500 for Europe however. From 1985 or the YZ490 was severely discounted. I remember seeing a good-excellent one for $600 around 1990 (only a few years old and it seemed like a huge bike for me at the time) an average 1985 Used CR500 would have been $1000-2000 in comparison. Having an air cooled bike has advantages and with the higher oil quality now should be excellent. Jetting is a huge issue and maybe you want an auto-jetter like Dial-a-jet for serious race use. Could try a yz250 ignition box for higher revs etc. You can actually get the hole shot on a well prepped YZ490 (Broc Glover did) but winning the race once the bike gets hot is difficult (possible pre-detonation problems). Could always try to duct fan it. Would be fun making a e85 YZ490 with all the tricks and smoking cr500s and KX500s along with all the common 450s people ride now.

[@WickedRC]

Not even close to fixed

[@micjubba709]

Pilot jet is tiny a 50 on a 490 should check for sea levels to for carb bikes sounds like its not getting enough fuel did u check the needle height aswell

[@victorhhh6061]

Well it still run like shit its NOT fixed

[@marklowe7431]

My father had one of these ex factory race bikes. Pestered him to ride it many times. Rode it once.

[@doobiesnacksog4697]

Take a magic clean eraser to the plastics thank me later will make em look brand spanking new baby

[@kyoakland]

Agreed it works

[@donaldcampbell7894]

Very first thing with a two-stroke warming up a two-stroke does not mean heat in the engine. Warming up a two-stroke means clearing out the bottom and to where it’s not loaded up with fuel in the crank case. When you start that thing you should burp the throttle wide open until all the smoke clears. Hold it wide open till the smoke clears for a few seconds each time then it is warmed up two strokes load the bottom and you have to keep that cleared out they are meant to run wide open. Second of all you are way too rich that engine should sound like it’s about to come apart then you’re right. That engine should whine to a point where only dogs can hear it. That’s just a friendly heads up.

[@donaldcampbell7894]

I promise I’m not trying to be one of those guys but I’m 17 minutes in and I’m telling you it does not sound better