My FIRST RIDE on the KTM Killer! (electric start Yamaha YZ250 2 Stroke)

Having finally completed the 'KTM Killer' 2009 Yamaha YZ250 2 Stroke enduro build, I couldn't wait to get out there and put it to the test for the first time! Particularly the new SmartCarb SC2 carburetor, and MotoSR enduro tuned suspension which promised to make a huge difference to the bike's engine and handling characteristics... Unfortunately though this inaugural test, fell right after the worst downfall we've seen all year. Long story short, it was gunna be muddy one!
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EARLY ACCESS & BTS
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SOCIAL MEDIAS
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CREDITS
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Starring:
Ash Sowman
Edited by:
Ash Sowman
CHAPTERS
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0:00 Cold Opening
0:05 Bits4Bikes Affiliate Link info
1:45 Introduction
3:04 Riding
11:19 First Thoughts
13:28 More Riding
27:16 Conclusions
29:31 End Screen

[@ashsowman]

Whites Powersports are a big company, but they're new to and wary of this whole KZbin thing... Let's show them how awesome this community is and how much we appreciate their gamble on us 💪 bits4bikes.co.nz?bg_ref=977:BQl1xy8Lrs And who else is excited for the big showdown? Do you think we've successfully crafted a 'KTM Killer' or not quite there yet? Comment what you think!

[@jeremysalle5005]

I know it’s a very advanced project, but the biggest thing you should add is the yz250x gearing. You can get the kit from yamaha or other distributors. I was able to open the bottom end on my bike with no issues and I’m just 14.

[@franzkrautwaschl2734]

Flywheel wheight is all you need, maybe a low compression head and fmf gnarly pipe and there you go…

[@panic-revv85]

WR transmission will fit in that bike. Stock carb puts out more power as well.

[@mikeb5]

i have a yz 250x that ive been modifying for similar type of riding (soft hard enduro) and ive had great luck with apex racing XC head for more low end power. Ive also ordered and installed a softer more "linear" power valve spring from a company in australia called Cisco racing, it takes away that sharp and aggressive mid power valve hit. Ive also modified the clutch actuator arm and made it a little longer to provide a larger contact patch and a easier pull!

[@mikeb5]

@@panic-revv85 how does the WR trans compare to the yzx trans?

[@njmxjunkie3128]

Ash unless you add a heavy flywheel weight you’ll never change the fact that it’s a race bike with a race trans and race gearing, adding the weight will increase traction 10x, make the bike lug through hills, it’s the only real way to compete with the counterbalanced ktms

[@njmxjunkie3128]

Not to mention how badly your stalling at every small Obstacle. Honestly I’d put an 11 oz flywheel weight WAYY higher in value than the electric start. The electric starts Great when you stall in awkward situations however those situations won’t make you stall anymore with a heavy weight

[@njmxjunkie3128]

Other things you can do that will help substantially are, adding an 18” wheel with a wider heavier rear tire. Beefier chain and steel sprockets. All of this will somewhat take away from that sharp 2 stroke hit and smooth it out. That moving mass will stop you from stalling and just let that rear tire dig and give you great traction

[@LoweSpeedFab]

@@njmxjunkie3128 You can purchase these electric start kits at the same weight as a 11oz steahly not sure which option he fitted. I have no experience with these Panthera kits but the flywheel weight is defiantly necessary.

[@evanhough60]

Ktms are race bikes with race trans and gearing, it’s a motocross bike vs an enduro bike, the rest of the series shows he’s already done all of that besides the wheel

[@TroNPopz209]

the electic start kit has a heavier acting wheel. the electromagnetic drag adds flyweel weight. as well as its bigger

[@jacobusbotha389]

Love it! I added the 250x head, powervalve and governor spring with the 250x header and silencer to my 2008 YZ250. Made a huge difference in low down torque and smoother power delivery... I can defenitely recommend that if its something you want to do.

[@enduro-parts-aus]

was going to also suggest this !

[@thatoneloser3719]

The 250x are a great bike and should be more recognised I ride one a fair bit

[@lowiqkid4780]

This bike is insane

[@maxiur39]

Hello,you must change rear wheel to 18 inch with tubliss,exhaust valve to yz250x one- that gives you more bottom and midrange power,muffler to yz250x longer muffler(that gives you more bottom)😜💪🏼💪🏼

[@rob_johnson9274]

The 18 inch does nothing !! Just needs a bigger front sprocket smaller rear but keep race pipes on other wise they lose all go . Well that’s what I found out with my 2021 yz250

[@chadrides914]

@@rob_johnson9274 the single greatest upgrade to my woods built Yz250 is the 18” rear wheel.

[@damolux3388]

@@rob_johnson9274 18" is far better for offroad / enduro. More sidewall gives greater comfort, flat / rim protection, greater side wall flex and contact patch at lower pressures. There is a good reason production enduro bikes are fitted with 18" rear rims.

[@joshuavanzuydam5044]

He just needs a full WR Conversion. The YZ250X is a cross country machine. It is more dialed to Enduro than the YZ. But it isnt as geared as a full WR Conversion is. WR Wide Ratio Gearbox. Weighted Flywheel. 18". New sprockets, new clutch cable and acctuator. If you can add a reliable e start... great Guys here in Southern Africa have been doing the WR Conversion for years. Ive ridden a YZ250X extensively and had a few rides on my Friends WR Converted bike and the Difference is big in the tough stuff

[@chadrides914]

@@joshuavanzuydam5044 13/51 gearing with the stock transmission on the 250X is very very good. That same gearing with the stock 250 is good until you hit Fire roads or transfer sections. The stock 250 trans doesn’t have long enough legs when geared down unfortunately. But it’s a non issue if your not concerned about top end.

[@cosmocopus156]

I love the sound of yz two strokes. Nice bike.

[@stephangiannoulidis509]

Stock pipes and motor jetted spot on with 13-51 gearing and 11oz fww with a 19inch gummy rear tyre and I am truly amazed how well it lugs with such little mods

[@H8er-Maker]

I've seen this attempted before. After about $4k + the price of the YZ it was just ok. The way those YZ's come on the powerband is sumthing you can't beat out of them. After an 11oz fly wheel weight & 12 oz we felt like we were getting closer so we got a weighted clutch basket. 14oz weight difference. We ran out of room to for a bigger flywheel. The basket felt significantly smoother but you still had cover clutch if locking up the rear tire. After all is said & done our bike was okay in GNCC races but not for hard Enduro. I definitely wouldn't trust myself to tame powerband on unpredictable roots. I enjoy your attempt, I wish you luck.

[@wakawaka12320]

This is exactly what im saying to everyone, theres a big difference between "hard enduro" and "single track" so many people think thet ride hard enduro, the yz250 is fibe doing this type of stuff but the euro 300s are they onky true hard enduro master

[@singletrackmarc819]

You must not be that good of rider because yz250s are killer gncc bikes bud. One of the best ever

[@EarthSurferUSA]

@@wakawaka12320 Hard enduro? Get a trials bike.

[@EarthSurferUSA]

@@singletrackmarc819 Not stock. The YZ250 is not great for anything stock. But it could be made into anything you want, but a 450 beater on a fast MX track.

[@miketursky1410]

I might be biased, but I thing you could have improved the jetting on the Keihin to work well.

[@jonathoncatterson8901]

Agreed. Finding the right jets and a suzuki needle

[@anthonys9754]

I don’t know if they ship over seas, but I added an apex innovations head with an XC dome to my yz250x and it helped the low end substantially.

[@monocogenit1]

For sure. Apex head with Xc dome made big difference on my yz 250 x

[@liamwilson1948]

I think it's time to go full enduro, it's headlight time, I think a headlight off a wrf would fit but you might have to make custom brackets or just use some zip ties lol. And a tail light off a wrf, that should fit and all you'd need to do is drill 3 holes In the back fender

[@d8gty392]

I have a WRF Headlight from my 2013 450 fitted on my 2020 2t 250 fits perfect in the original mountings for the number board & bolts on at the sides on the fork yolks 👌🏼 looks epic

[@liamwilson1948]

@@d8gty392 bolts right on lmao. Most bikes look better with a headlight. Especially the wr headlights

[@d8gty392]

@@liamwilson1948 Does bolt on to the top yolk pal we’re it does on the WRF models lol 😂. The 2x 10mm’s that clamp the forks it goes on one them at either side, & the two nipples match up on the bottom exactly like the number boards

[@kyenorris424]

Not sure if the panthera motersports has a flywheel weight but if it doesn’t throw one of them on there I heard they really help the bottom end power so you can lug it around all day

[@njmxjunkie3128]

I’ve been commenting about that this entire series he keeps ignoring it. If I’m not mistaking the panthera e start does add some weight to your flywheel but it’s very minimal, I also just think he needs more practice working the clutch

[@SuperNomad14]

Eventually I got to view the entire video to the end today. Great content. This whole YZ-to-enduro thing is super interesting to me.

[@samenos7224]

Got a 2013 I picked up I'm gonna do a similar build on, it currently has a fmf full pipe amd flywheel weight all else I'm gonna do is 18 inch rear wheel maybe change the reeds, revalve the suspension and some cosmetic work. Much respect fr east cost USA

[@rippinross3238]

I almost bought a 2022 yz. Ended up with a KTM XC. And I gotta say I am very happy with its performance in hard enduro

[@ItzSkittzy]

Just come across ya channel! Binge watching the hell out of ya vids mate! Good shit bro this is a class kiwi content

[@maxbell5094]

Ceep up the good work I always like it When you ride and your always so much better every time

[@maxbell5094]

Also I loved goonsqwad

[@willemmatthews676]

18 inch rear wheel, flywheel weight, yz250x gearbox, will make it to where you want it

[@TroNPopz209]

250x gear box same first and second.

[@markwheat2668]

Blend and polish the exhaust port if you haven't already, polish up your power valves so they don't drag when opening, check the carb spacer it may stick up in the airport. Stock the exhaust port is coated with the cylinder hardening material and is rough and cobbley. Let her breath!

[@cstarbuilt3338]

Well, I just stumbled in the channel. Watched all the ktm killer episodes. Now where is the final comparison!!! Lol. I’m subscribed 👍🏻

[@highlandcycles]

After owning a ton of YZ’s and a fair number of KTM’s and doing the same things to my YZ’s I determined that the YZ’s are just not as good at the harder stuff but are far superior at going fast like desert style fast.

[@ashsowman]

Yeah I'm excited to get the thing up to speed, even just if these trails had've been dry the problems I'm having here would've been non-issues. I've got a feeling I've created a pretty slick little time-attack style enduro machine here... Time will tell

[@highlandcycles]

@@ashsowman you have for sure! Hold er wide!

[@brockpotter4952]

We had loads of rain in south canterbury too

[@TroNPopz209]

18 inch rear and TSP moto LOW comp head

[@jaybray4901]

I had a 2015 yz250 that I sunk quite a bit of cash into for Enduro and single track and it turned into an awesome bike. RK Tech head, heavy flywheel,18 inch rear wheel all of it Then I bought a 2018 KTM 300 Xcw and sold the Yz. The Yz will not be a Ktm killer no mater how much you sink into it. The Ktm 300 engine lugs like no tomorrow and the clutch is incredible. The Yz suspension was for sure better ill say that much. Another thing I did was retard the timing 2 degrees on the Yz and that made a big difference in taming down the hit of the motocross engine for single track and enduro use. Highly recommend it. There is a write up on Thumpertalk on how to do it.

[@michaelwendler5589]

But did you do a big bore cylinder on your YZ250? Because I have the ESR325 cylinder and Panthera e-start on mine, and it will lug all day long. Tremendous more torque than a 250, and has no problems with slow technical stuff.

[@adamblundell6402]

Awesome work man. Loving the KTM killer content. Does it have any over heating issues? Would you ever look at putting a thermo fan on it?

[@clayboi6939]

Never had overheating issues on my 96 yz250. Even on hot days, at a slow pace and with lots of clutch work on technical gnarly single track. I think the yzs have great cooling systems. 250f and 450s riding with me on the same trail overheated.

[@daltonjarrett2045]

Same, I always had overheating issues on 4-strokes, when I switched to a YZ250x I can't get it to overheat.

[@ashsowman]

Thanks mate! Nah, literally every single Yamaha I've taken into extreme stuff (including a YZ450F) has never overheated. Yamahas just seem to run cool as a cucumber

[@liamwilson1948]

@@ashsowman sometimes having a cold bike is a down side, my 2011 wr250f is always cool and when I hit some bogs and river crossings it like turns off or just wants to stall easier lol,then I have to use choke to start it again haha, the only thing that gets hot is the pipe, I could cook a steak on the muffler and it would do a better job than a BBQ lol

[@robertmuir734]

With all the work done I think what would help the stalling would be head work or an aftermarket head. You could also get some yz250x bits but I think the head would really help.

[@quirinm.]

I have the X and i put on a normal head, it has more torque but harder to start, stalling is no different

[@benhansford3842]

You should ride more enduro races with commentating

[@ddrowdy7666]

Adjust the rear brake peddle so more toe input is required to engage the brake, might reduce the locking up and killing the motor a bit. I used to have that problem too but adjusting the peddle pretty much cured it.

[@torariders313]

Great vid mate! Just copped myself a spark plug and sprocket. Legend

[@ashsowman]

You sure are

[@Therealsteezuschrist]

finally a new ep

[@barra245t2]

Mine used to do the same stalling thing.i was using oem clutch plates and yamalube gear oil.i changed to Barnett clutches,steel and fibres and started using belray gearsaver oil,made a huge improvement

[@EarthSurferUSA]

You can also lower your brake pedal a bit, turn up the idle a bit, and use the clutch when braking at very slow speeds. The only way a different clutch will work better to avoid stalling,---is if it slips. :)

[@BugsEverywhere]

love the content keep it up man

[@adzythepwcblokeinaustralia5467]

You picked a shocker of a day being so wet to test the bike .

[@clayboi6939]

Stalling issue could be resolved with an auto clutch.. Normally I'm not a huge advocate for them, but in your case it may help since you're riding a track bike on slow single track and you really like to lug that motor around. Your riding style requires a lot of precise clutch work to keep that mx engine spinning. Trust me, I know your pain, I enduroed a 96 yz 250, its alot of work. Adding a few teeth to your rear sprocket may help as well but you might need a flywheel weight to keep it tame.

[@42z49]

Sounds like the starter is working well. I saw a video the guy was having some problems with it.

[@DaBiEsTyBoY]

You just have to work out that throttle when your clutch in stopping. I have a 97 yz250 big bore kit that snubs out with a perfect carb setup. Its just the nature of the beast

[@jmleban]

Yamaha forever

[@DuhYaThink]

Flywheel weight and suspension are the 2 biggest mods that would make a difference. Imo

[@EarthSurferUSA]

Usually good things to do for a MX bike used in the woods. But in this case, IMO, the YZ250 is pretty poor in the lower rpm range, (I have the bike, and modified it a lot), and adding flywheel weight to that will make it track the super slippery stuff better, but be sluggish down there too. For my engine mods, I use a FMF Gnarley pipe, V-Force reeds (with no aluminum spacer plate), and lowered the cylinder, (No cylinder base gasket, but seal it well), to get the compression up, (have to run 100 octane gas) and match the porting better to the lower rpm pipe. Now it pulls great from down low, and still revs good. Great for my whooped out single track riding, and it would take a flywheel weight well. I would have to say though for suspension, having to modify it is usually not needed. There is a lot to adjust, from spring rates, to oil viscosity to oil height (forks), and of course the dampening clickers, (which can be out of range I bet still sometimes). I lowered my suspension .75" though,--and it made a huge difference. :)

[@markusmaximus8699]

Just found your channel and really enjoying the Ktm killer vids. Is there an update after this video?

[@janvalvoda7792]

Stalling problem - try heavyer flywheel and lower compression head

[@TroNPopz209]

low compression head better

[@craigsteinman9807]

That's the problem the high compression on regular yz..add water in the woods or anywhere really off road now it's a handfull ..for me if u ride both mx and off road get a mx bike ..it's alot easier and cheaper to make a mxbike trail friendly than a off road bike a good mxbike...the gear box is the difference

[@philipsmith6152]

Luv the vid, try a Steathy or a GYTR 13oz flywheel weight, will help a lot with the stalling

[@gab223334]

I run solid rear disc and carbon pads for a more forgiving feel. Cheers!

[@zanedoamaral8819]

On my yz125 we put a 2mm spacer on the Reed box - not sure if you can in the 250 but helped bottom end a lot. On my 250x I put a traction disc on the clutch. Search it on internet. Not sure if it’s just in South Africa or what but helped a lot

[@mojavemike3060]

Do you have an update to the panthera- problems or issues- I watched the video when it first aired but I’d like an updated video on the yz250

[@PONO-go3ee]

Definitely If you Get Smart Carb / Electron Carb with Bouncy Sticks for your Weight Completely feel different

[@jimbo4203]

It's crazy how much better a 6 speed tranny is over a 5 for offroad, and get the heaviest flywheel you can get. You can't even tell any difference with the small weights

[@auskilluminati333]

Under rear heavy low speed brake my YZ250 always stalls out I have to clutch it in

[@wildmates9527]

your videos are so good man where about's do you ride

[@adzythepwcblokeinaustralia5467]

Add a Rekluse auto clutch and enjoy a left hand rear brake !

[@nickhoughton4452]

Agree, i have one on my 200 EXC & left hand rear brake lever, (transformed the bike & never stall).

[@firemenonbikes]

I third this! Rekluse (Radius CX) and LHRB - hands down the best money I have spent on my 250X. Imagine trail riding for 3 hours through this type of terrain and NEVER having to touch the clutch OR stall the bike, while jamming the rear brake (without moving your right foot) as much as you like... its a thing of beauty. (clutch is still there if you do feel like or have the need to use it). better IMHO than spending that money on a E start.

[@bellowworld227]

Hi

[@owenusher]

More yz content!!!

[@aaronodguy967]

Check your ignition timing. I had a similar problem with my yz250. Adjusted the timing and now it doesn’t stall all the time.

[@dylanhedges5634]

Love it!

[@shadowlm315]

Sounds like your getting a minor amount of detonation with the throttle closed rolling down some of those drops.

[@ashsowman]

I did wonder that editing this video, I think it's cause I had 50:1 in it, I'll be going back to 40:1 from here on out. I was trying 50:1 in the hopes that would stop it smoking so much but it made no difference

[@shadowlm315]

@@ashsowman the amount of oil might not change it, but it’s worth a try. These YZ’s are know for timing issues with the timing marks on the stator, case, and crank for being a little off. I also have to run 50/50 110 octane and pump gas in mine to get it to stop even after retarding the timing.

[@chrisrieger9201]

Did I miss an episode with the modifications?? What mods are the to the engine/clutch???

[@lenny3394]

ADD A FLYWHEEL WEIGHT!!!! and lower the gearing a bit

[@terryfinch9319]

Where is episode 5 😢

[@cooperheerebout2733]

You should make it road legal for some of the enduro races that require it, sick as content bro🤙

[@Elcostybpm]

Need more vids? From this bike

[@wakawaka12320]

With respect no matter what u do to it, it will never come close to a euro 300, my 21 gas gas 300 is impossible to stall and has so much torque, thet are built from the ground up for hard enduro, the yz from its roots will never be great at hard enduro, the euro 300 are deadly smooth and power delivery is perfect for hard enduro, this type of riding your doing is just single trial which is different, im talking creekbeds and slow technical climbs

[@johnnydangerously9426]

The Japan bikes are vary consistently dependable . Other brands not so much . 😎

[@joshwheeler25]

Next mod throw an apex technical innovations xc head on it

[@Brity_107]

This is my dream bike, yz 250 built to a enduro, good work but I see you use 2 fingers on the cluch, would you like to try magura hydraulic cluch? Or do you like feeling of the cable?

[@ashsowman]

I usually switch to two fingers on slower trails like this because you don't need so much grip strength. You'll notice when hit a log or something like that though I go back to one... It's just how I ride, a magura won't actually make it any lighter and won't improve the feel either, just change it and give more consistency when hot. This type of riding doesn't heat the clutch up enough to change the feel though so it's not a problem

[@RorydriftmansxrsilviaWilkinson]

@@ashsowman sick asf vids brother . doing the mahi mahi mahi mahi mahi lest go ride days soo awesome an your haveing lots off funn doing it too buddyy by the looks on your face sickas asf content ash sowman where abouts where yo rideing etc. in this vids out in the bush bro any more motocross vids comeing soon in the next vid or any motocross events on in nelson tasman nz. new zealand

[@singletrackmarc819]

So yz250 or the wr250f if u could have one

[@enduro-parts-aus]

changing the clutch to hydraulic may cause less stalling, due to the fact you might have more of a wider engagement point / feel?

[@Milotinov22]

You can put a hidraulic clutch in it

[@Sid-xd6nc]

u spend dat much 💰💰💰it b better den all

[@wdsracer]

Awesome video just wondering what gearing you are running?

[@ashsowman]

Just stock

[@tonygee3284]

Ash did you go for the 36 mm or 38 mm smart carb Now we wait

[@johngray722]

You can’t say first ride wen you’ve rode it a bunch of times before

[@submarineparty3846]

First . by the great vid

[@chrisrieger9201]

Why’s it stalling out again

[@EarthSurferUSA]

Low rpm's letting off the throttle with the clutch out to far and on the rear brake.

[@coriehart6590]

Have you considered the rekluse clutch set up never stall again

[@EarthSurferUSA]

I agree, the leader of ugly plastic that became contagious to all bikes plastics designed by the batman school of abstract art. But orange still keeps the ugliest honors. :)

[@matthewhayden2529]

I personally think the yz250x would be better at this kind of riding than the just your standard yz250.

[@mxrcmadness7266]

Location please?

[@brandonlenox2543]

i have a yz250x yz450fx and a 2022 ktm 300 xc the yz250x has apex head rekluse clutch wer suspension 1/2 lower foot pegs adjustable shifter n brake pedal tried different front and rear sprocket my foot gets stuck under the shifter all the time and the brake pedal hangs on my ankel making the rear brake drag i have pushed and pulled the forks every where and it will never corner like my 300 the 300 is more refined than the yz250x will ever be the ktm fits me better and rides so much better for me the 300 will lug or rev and the yz250x has wierd transmission gear ratios the ktm 6 speed is spaced so much better not to mention the e button steel frame and a butter smooth clutch no my friend the yz250x will never ever be a ktm killer i should i know i own both the yz250x is fun but not in the ktms class

[@jackmills1274]

Rekluse clutch as a anty stall

[@JB.buds.]

I help y

[@franciscoescobar7647]

any isuses with the electric start?

[@ashsowman]

Nup

[@franciscoescobar7647]

@@ashsowman okay thank u.

[@EarthSurferUSA]

Just ovulation. :)

[@wirth315]

Get a Rekluse already and stop stalling all the time. :-)

[@rvh77]

Funny how so many people recognize the KTM as the bike to beat, then talk trash about it… haters just gonna hate I guess, 😂

[@EarthSurferUSA]

KTM is responsible for the ugly plastic movement. Now all the bikes plastic looks like it came from a bunch of graduates from the "Batman school of meaningless abstract art.". :)

[@jnavonoD]

Sorry but a YZ is not a KTM killer. I had a brand new YZ250X and I really wanted to love it, but it was rubbish. My 2012 KTM 200 is miles and miles better as an enduro bike. In every way, except for the shitty old White Power (lol) suspension, which in 2012 might have been hot shit, but is hot garbage today.

[@JB.buds.]

🥵🥵🥵

[@samoliverio7455]

One problem: you can't beat a KTM at its own game

[@catow465]

smart carbs dont add power, they just blow bikes up. if you want more power just tune it. or get it tuned by a proffesional

[@SmartCarbFuelSystems]

Name one person owning a SmartCarb SC2 using the correct metering rod, having correctly installed it, and having properly tuned it that has blown their bike up; we'll wait. Doesn't happen. Furthermore they do add power as is well documented 1st and 3rd party. Diogo Vieira won 2 Portuguese National Super Enduro Championships using the SmartCarb SC2 on his YZ250. They are currently used by professional racers/mechanics in the USA and Europe. We encourage you to do some more research on our product before putting these type of statements out there.

[@71.racing]

nahh, not close to proper enduro bike. doing all this modification it is, like transgender surgery... its mx bike, gearing etc. Yamaha working on 300cc fuel injected enduro bike.