| Author | Message |
RunningFree
111 posts |
#50662 2008-05-19 11:37 GMT |
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I've got a '78 SR500 with a stock 34mm Mikuni carb. The jug is an overbore 535cc. My bud has a 40mm Mikuni on his V Star and wants me to put it on my thumper.
Anybody have expierence with over size carbs on big singles? |
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NaughtyNinja
109 posts |
#50663 2008-05-19 12:12 GMT |
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You've got a 7% increase in cylinder volume (535 vs 500) and are suggesting a 17% increase in fuel/air mixture for that volume. Did you re-jet the 34mm to compensate for the overbore? I think you'd be better served to find a tech with an EGA machine (exhaust gas analyzer) and have your current carb re-worked rather than replace it with one designed for a 600cc motorcycle. You can make the bigger one work, but you need to consider changing to a free-flowing exhaust and changing cams to one with more lift or duration, depending on how and where you ride.
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