Yamaha XJ650 Part 31 First Start!

I tidy up a few things on the engine, do a few checks and then start it up for the first time.

[@brwhyon]

There's just something magic about the first start up on a build, hearing that first "Pop", then "Roar" ! ! It never gets old.

[@ardennielsen3761]

I fired up one of there just the other day, had the cylinder head off because all eight valves were bent, held a lead rod to them and swung a hammer on them till they sealed up close... after that I put the head back on, used the old head gasket and torqued it down to 34lbft. had 34 65 80 and 20 psi of compression... so I filled the tank with kerosene, sprayed lots of fuel in the carbs and hit the starter. It fired up and i let it rev as far as it would go for 50 seconds and then slowly started letting off over about 200 seconds then shut it off and let it cool... took much less kerosene oil mix to start the second time, actually switched to a 80/20 gasoline kerosene mix and ran it at 3000 to 6000 rpm for 15 minuets... the next day I ran it at 35mph in first gear for 15 miles... 7000rpm to 9500rpm. The lower jug gasket was replaced with lock tight 515 flange sealant so the compression ratio is 10.5-1, still runs on the kerosene mix gas but the compression detonation makes it tricky to run it to higher rpm's cant just open the throttle... 28-60 octane fuel, the ratio it has states it needs 91 or 97 octane gasoline. The valve cover gasket melted during the brake in! Runs much smoother then a 250cc dirt bike.

[@davidthehillbilly7995]

Your smile says it all and almost matches mine. Well done....

[@MattysWorkshop]

Congratulations mate, it’s alive, Bloody top job, sounds a lot better with the baffles out, I bet your getting as keen as hell to get it finished now it’s running.

[@Mezzmoengineering]

Thanks Matty, getting there. Not long now and I'll kick off my next project...

[@Taubenshit]

Awesome dude loving the straightpipe Sound ... what a pice of Art

[@markssmallengines3542]

Sounds awesome I've been waiting for the first start 😀 very impressed on how well it started with all the mods well done 👍

[@Mezzmoengineering]

Thanks mate

[@bearwood85]

Been looking forward to watching this episode for a while now 😊😊😊 soounds really good

[@shawnmrfixitlee6478]

started right up !! Great job man .. ENJOYED

[@Chechenzko]

Min 9:39 wow love it!!!

[@paulbull3765]

Beautiful mate, well done 👍🏻

[@Mezzmoengineering]

Thanks Paul, glad you like it

[@cavscout62]

Sounds Great!

[@Mezzmoengineering]

Thanks mate

[@mattcrick2156]

Sounds awesome mate.

[@Mezzmoengineering]

Thanks Matt

[@rodslogic4350]

Little Ripper sounds awesome 😎👍

[@Mezzmoengineering]

Thanks mate, I think its going to be great for cruising

[@rodslogic4350]

@@Mezzmoengineering Definitely. Especially with that stereo exhaust note.

[@randysrestoration]

Sounds awesome for first start! I have been watching all your vids up to this point. Subscribed too. How much power are you hoping for?

[@Mezzmoengineering]

Hey Randy, I was surprised how it started first go. Sound is nice. Whilst I've done lots of engine mods, it was more about the challenge than the power. The bike has plenty of power for me, not sure how much but happy with it....

[@johnnyrotten3887]

If he was any more intelligent he'd be an Alien Bloody ell smashing job , im blown away mate

[@Mezzmoengineering]

Thanks mate

[@mattmiles8895]

Your a god

[@jimmyguenza3767]

Omg dude you fucking nailed down sounds so good ya much better without the baffles ! Carry on mate ! Jammin Jimmy

[@clickireland1113]

Before I even play the video; Well done. PS Cyl head's showing promise coming off.

[@Mezzmoengineering]

Good on ya mate, patience is key

[@clickireland1113]

@@Mezzmoengineering Hadda hacksaw blade one of the long ccase bolts. Heads off now but I Irish tempered things a bit. Just need to buy cyl head now and barrels and I can rebuild. Class to have your videos thanks mil

[@valneisantoscostacosta5645]

Motor ligado, isso é muito bom de se ver...

[@olivercalebgutierrez-suare2673]

que hermosa.. Felicidades.. mi maxim aun no enciende..

[@Mezzmoengineering]

Hi, I made my own system, Check the earlier video. My manifold pipes are stainless steel, 1.5 inch.

[@clickireland1113]

That was ****in class.

[@Mezzmoengineering]

Thanks mate

[@peteranthonyanakwe9040]

@mezzmo im doing a build on a xj750 and im trying to see how you wired the ignition. A picture or something would help alot

[@Mezzmoengineering]

Hi mate, check this link to the manual. www.revzilla.com/assets/0001/9454/motogadgetm_unit_blue_digital_control_and_fuse_box.pdf I don't have a key on my bike, I use my phone and also have the RFID lock. The RFID sensor connects into the "lock" where the ignition would usually go.

[@peteranthonyanakwe9040]

@@Mezzmoengineering thanks for the speedy response I have this article saved but more specifically I was referring to how you have the tci/Cdi and reg rectifier wired. I’m visual as I’m sure most of us are as well so pics help tremendously

[@Mezzmoengineering]

@@peteranthonyanakwe9040 I don't have any pics as its all hidden under the seat area. I don't recall it being that difficult. I'd suggest first checking the stock wiring diagram and then the M unit diagram. Happy if you want to send me clear pics of your wiring to see if I can help....

[@peteranthonyanakwe9040]

@@Mezzmoengineering I have pics what’s a good way to contact you with the pictures?

[@Mezzmoengineering]

Hi mate, you can email me at [e-mail]

[@glenfricker1736]

Amazing work!!! Where did you order the mufflers from? They are exactly what I'm looking for!!!

[@Mezzmoengineering]

Hi mate, I found them on ebay. Can't find the link but shouldn't be hard for you to find ones like these

[@martinian0340]

Awesome! What's the next project?

[@Mezzmoengineering]

Next project coming very soon. Already have it lined up, its not another bike but more along the lines of the Mowzuki. I'll reveal what it is soon

[@Twinsroblox56]

I love im building my 750 seca

[@lukas9206]

What shocks have you ended up installing on the bike?

[@Mezzmoengineering]

On the rear I fitted Koni's

[@therudolphs08]

What size tires are you running? They look bigger than stock. Also, I want to lower my XJ 750(Midnight Maxim) but they have the adjustable forks. How can I lower them? Or should I get different ones?

[@Mezzmoengineering]

Hi, I don't know your set up but the front forks can be lowered easily by loosening the clamps and simply lowering. Rear shockers usually have some adjustment but if you want more you will need different shockers with the height you want

[@therudolphs08]

Yea I know I can slide them on the triple tree but sometimes it makes the ride a little sketchy when doing that. I may look for some old KZ forks to lower and swap. Both are 36mm so it should be ok

[@heathenseye]

Just picked up a 1983 maxim 650. Any ideas as to where I can get a full wiring schematic for it?

[@Mezzmoengineering]

Search on-line or best option would be to buy a Haynes manual. These should be on ebay...

[@Aciecarter238]

Just got a xj 750 83 model. Having alot of bsck firing through the carbs. When im atarting it itll backfire bad. Is that the carbs out of synch or a timing issue? Ive had it running before but wont idle. Only runs at 1/4 to 1/2 theottle

[@Mezzmoengineering]

Hi mate, hard to say. If it was running well before then most likely carby issue. If you have changed something on the engine then that could be part of the problem too. My guess is you need to remove carbies and give them a good clean, check for air leaks, throttle shaft seals, intake boots etc

[@Aciecarter238]

@Mezzmo Engineering the bike hasn't run in 11 years. Doing it for someone else. An the starter clutch is bad so whole motor has to come apart. Also got a 78 xs 750 yamaha that needs starter clutch. The 3 cylinder 750. Both need starter clutches. It got a little better when I adjusted the float level so my guess to much fuel from wrong float level

[@Mezzmoengineering]

@@Aciecarter238 Hi mate, if it hasn't run for that long then for sure the carbies will need a thorough clean. That's the best starting point.

[@willwarren-kidd4421]

What size tire setup do you have at the back

[@Mezzmoengineering]

Hi Mate, I made some mods to get a 150 to fit on the rear with a 4 inch rime

[@olivercalebgutierrez-suare2673]

que pipas (exhaust pipes) son esas? what brand of pipes do you buy?

[@Mezzmoengineering]

Hi, I made the manifold myself.

[@jehqwoumbeauchamp8734]

Hey could you help me out! My Yamaha xj650 maxim is having problems I took the headers off to see how much pressure was coming out and cylinders 1 and 2 and pushing hard but 3 and 4 aren’t pushing as hard. It’s almost week. The bike is a project and I’ve gotten it to the point where after a few fires it’ll start up if I put my hand on the back of the carb. The carbs are dog shit but I can’t even roll the throttle there’s no response at all and it takes a few turns to start it up. Is it happening because of the carbs??

[@Mezzmoengineering]

I'll guess the issue it carby related. Other basic things to do is check your plugs, timing and test compression

[@jehqwoumbeauchamp8734]

@@Mezzmoengineering now anytime I go to start it the starter solenoid just clicks. Starter motor doesn’t turn. The solenoid is brand new. Start motor was showing signs of failure before but now it won’t crank. Would a rebuild kit do the job?

[@Mezzmoengineering]

@@jehqwoumbeauchamp8734 Hi mate, this will be either a flat battery or you need to replace the starter motor brushes.

[@riazshamsudeen6435]

Do you have link for the exhaust?!

[@Mezzmoengineering]

Check my earlier video on how I made the exhaust....

[@vasyakas2392]

друг напиши какие зазоры, английский я умею только читать?! у меня yamaha XJ 650 special ,1983-1985 friend write what gaps, English I can only read ?! I have a yamaha XЈ 650 special, 1983-1985

[@jodybell4413]

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