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I believe I have found the issue as the front piston has a taller stroke then the back (minimal but makes a compression difference). Everything has been torqued to specs and the motor runs perfectly fine. can i just put in a smaller dome to bump up the compression?

this seems like the easiest option first

when doing a leak test do i seal off all the water line ports as well or just the exhaust and intake ports?

how do I do a leak test? I also read somewhere that the 64x motors have a weird timing or something is there any truth behind that?

it was bored and honed, and I have new pistons and rings I even swapped domes on the cylinders thinking they were miss labeled and same outcome.

A ski i bought the guy said it was a 760 and that all the info he gave me. I honed the cylinders to 84.5 no porting (stupid me) and a new ADA Head with 38cc domes. I found the motor was a 64x and I still have different compression in each cylinder. The front seems to be at the correct...

I Bought a new Ski last year and it came with 64x cylinder. Through out the year I have replaced the head and added 38cc domes bored and honed .5 over so new pistons and rings. and re jetted carbs. When I first put it all together I was blowing around 175 in the front and 150 in the back. I...

Has anyone seen or bought this CDI off of Amazon? https://www.amazon.com/Yamaha-Adjustable-Limiter-Blaster-Venture/dp/B00R5623W0

yes i still have them. i have the manifold and stock reed cages as well.

i have oem duel 44 with mani and reed cages. carbs have the easy adjust T handles. PM me if you are still interested

Updated and lowered

i used to use a hitch hauler and a beach tote

Greater Performance Girdled head. Came off a running 760. I don’t know any history of these or what size domes are on it. Could use some cleaning up. $80 plus shipping

Don’t the 760 64x usually run different compression originally. I remember reading that somewhere. Or was that just based on tHe stock head?

How do I measure the domes?

I recently bought a superjet so here is what it has. 62t case 64x topend, b pipe. I just switched to duel 38’s from duel 44’s and I just put a new ADA head with 38cc domes. I just checked compression and I have 175 in the front and 145 in the back. The pistons and sleeves look really clean...

I have duel 44s with 62t manifold

Yes those grips on amazon work. Just make sure you tighten them really well. They dont lock as well as the ODI and had my grip coming flying off.

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TTT