I have a gpz 900r a8 it has keihin cvk 34 on it i put a 4/1 exhust on. what jet size do i go?

Question edited for clarity.
Question moved to model category.

snippets of help and jet kits. It is a racing bike, so jet sizes are determined on a Dyno or plug chops on a drag strip.

https://www.google.com/search?q=1995+Yamaha+fzr600+cvk+stock+jet+sizes

Carb setup and tuning

https://www.google.com/search?q=1995+yamaha+fzr600+carb+set+setup+instructions

Service manuals

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Take off wheel...remove cush drive on sprocket side...prise the oil seal out on the brake side and you'll see a circlip...remove this and drift bearings out. Drift new ones in with a socket or bit of tubing that is the same size as the bearing outer so as not to damage the bearings...re-fit circlip.

Any motorcycle parts dealer would be able to put you right on track. A Kawasaki parts department will be able to tell you as well.

by the sounds of it, it may be a 30 millimeter.

Go by the part number. Keihin make carbs for lots of manufacturers.

note your yr. make, mode. look at this site they have everything you will need. http://www.british-customs.com/america-speedmaster/ have fun

Yes only the A1's were difrant A2-A9 the motor's never realy changed A7 had a better chamchain tensioner but from A2 the motor never realy changed Note the is for ZX/GPZ900R motors and not ZX9R's

No but there is not much between them if i remeber right the cam lobes are slightly bigger which would give you more air and fuel which maybe be detrimental. check cam lobe sizes in the haynes manual for 900 and 1000 and compare

36 front...42 rear