Million Dollar Question - 85 Tri-z

[Chris Smith]

What is the stock main jet size?

I pulled a 400 off of my carb and can not find on the net or on the forum the main jet sizes... I'd appreciate the help!

Happy trails!

[Bryan Raffa]

470!!!!!!!! send my money!! 1/4 of it to cory sprock and a 1/4 to yamahondaman!!! the rest to me in small unmarked bills... LOL

[tecat-z]

Well on 86 models the stock main is #320 and pilot is #35. The stock needle setting is the center groove. #400 sounds pretty far off the mark. Hope this helps out.

[Bryan Raffa]

86 is diffrent than the 85

the 86 used a Diffrent cutaway,needel and 2 turns out

[Bryan Raffa]

:cool: :cool: :cool: :cool: :cool:

[Chris Smith]

Did I say a million? Do you guys accept money order?


I currently have a 400 in mine. I am looking to start it up soon (Just ported-polished it and shaved a bit off the head). I heard Yamaha generally runs their engines rich from the factory.

Would it be safe to just use the 470 for break-in? I was thinking of keeping the stock carb on it with the 470 and adjust the mixture instead of jetting, that is, until i get the jet kit in the mail.

The other mod is a a DG exhaust.

:TrikesOwn

[maggiesboy]

four seven oh....... stocker on the eighty 5

[Bryan Raffa]

ya chris that will be fine,, it certainly wont hurt it,, you might want to look into a 38mm flat slide,,BIG difference!

[Chris Smith]

ya chris that will be fine,, it certainly wont hurt it,, you might want to look into a 38mm flat slide,,BIG difference!

:-D Looking into it :p Trying to get this guy ready for a trip coming up.