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Discussion Starter · #1 ·
1985 GSXR750F
Before:29mm carbs,airbox,micron road can=79 RWHP
After:34mm CV carbs,Stage 3 dynojet,micron race can=90 RWHP.
I know i've increased the power, but is the end result something to shout about or should I cry into my porridge.
 

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thats a good improvement i think

but,

your engine is the short stroke/wide bore yeah, and the later oil coolers were long stroke/narrow bore.

well i read somewhere that you can mix and match these parts with the long stroke crank and the short stroke, wider bore/top end giving 883cc.

is that correct ???
 

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Dan, if I recall correctly, the '85 is the long stroke motor. I had an '86 with a slip-on and jet kit and it made 85 rwhp so it sounds like yours is right there. Of course there is the different dyno, different day conundrum. I thought that my '86 stock carbs were the 34's, but I could be on crack. The later ('88-9) motors were the short strokers and made a bit more hp than the early ones but only in a higher, narrower powerband. Troy 341
 
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