TOPIC:

I have a set of 85 GSXR 29mm flatslide carbs. I intend to bore them out to 32mm (can be done checked with a mid-80's Suzuki road racer/mechanic/tuner). They are going on a 77 KZ, 1075cc, 12.5:1 cr, 425 lift cam, stock valves, mildly ported head, velocity stacks and Hindle Sidewinder dragpipe. A set of 36mm are not in the budget this or next year. Any ideas on where to start with main jet sizes?

Bike is for drag racing. Has a 750 triple swingarm (3" over KZ stock),KZ400 front end,raked frame,3.5"x18" aluminium spoked rear wheel,air shifter,2-step,Pingle wheelie bars,welded crank,undercut tranny and custom aluminium bodywork. Might/hopefully/should get high 9's out of it. Ran 11.04 with 29mm smoothbores,stock pistons,stock frame/body,wheelie bars,Hindle pipe and no air shifter or 2-step.

Thanks
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Helllllooooooooooo. Is there anybody out there? Just smile if you can hear me. Is there anyone home?

Am I out to lunch with this mod?

Hey Rom -- I had these carbs once on my Z1, sold them awhile back for the RS34s. I think these are gonna be great for a strip bike, excellent performance on top, but hard to get 'em good for lower revs. Were abrupt on/off throttle for around town.

I'll have to check my notes, but one thing I do clearly recall was I had to open the pilot screw way out. Stock is like 1.25 or 1.5 turns out if memory serves -- I had to crank them to something like 3 or 3.5 turns out to get a reasonable idle. I think I might have left them with the stock jets. Let me check...

A resource for you: a GSXR enthusiast scanned the factory manual pages for the carbs, put 'em out there right here: www.ablett.jp/bikes/gsxr/carb.htm

Parts are hard to find -- baby those gaskets, as they're expensive to replace.

I was thinking better around town. My builder says that 36mm flatslides would be the cat's meow for my motor. As 29mm on a stock motor for street they would be killer. Maybe a bit finicky compared to 29mm smoothbores. It's the boring out that will cause me more issues from a main jet point of view. What would a main jet be for a 32mm Mikuni flatslide. Never been one to worry much about pilot and air jets. Only interested in how they work at wide open throttle. Considering I launch at at least 5500rpm, I think I am on the main jet anyways. If it was a street or road racer might have more concern about it. Ran 29mm smothbores before went up 2 sizes on mian jet and didn't even bother with any thing else. Ran 11.04@122mph with Hindle Sidewinder, velocity stacks, slick and wheelie bar. All else stock.

here are what 33's come with stock if that will help,I ran 132.5's or 135's in my 1075 with 33sb's