Tri-z Carbs

[yamaman]

MORE TROUBLE!!AFTER PURCHASING AN 1986 TRI-Z(BEING REBUILT)WAS NOTICED THAT THE CARB WAS DIFFERENT.I WAS TOLD 85 AND 86 USED THE SAME CARB,MY 85 HAS THE CORRECT CARB IN BUT THE 86 HAS BEEN CHANGED FOR A 'MIKUNI' TRX OO'??THESE ARE THE ONLY MARKINGS ON THE CARB I CAN FIND.ITS RUNNIN ON A 320 MAIN JET TOO??ANY LOGIC REASON FOR THIS CARB CHANGE I MAY HAVE MISSED??AS THE BIKE RUNS AWFULL WITH IT,BUT RUNS GREAT IF INSTALL MY 85 CARB!!??PLUS ANY1 KNOW FOR SURE IF YAMAHA USED SAME CARB BOTH YEARS??THANX FOR THE HELP!!:doh:

[fishinmagician]

Yep, both years used the same carb, Mikuni VM32SS. HOWEVER, they TOTALLY redid all the jetting on the 86 model. I mean nothing is the same.
Check it out.

Jet Needle:
85 = 6H3
86 = 6F8

Clip Position:
85 = 3rd from top
86 = 4th from top

Throttle cut-away:
85 = 2.0
86 = 3.0

Pilot Jet:
85 = #45
86 = #35

Needle Jet:
85 = P-4
86 = P-2

Main Jet:
85 = #470
86 = #320