Technical > Fuel Systems

FCR jetting

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Gareth. J.:
As you know I'm going the FCR41 conversion on my car, Just wondering if anyone knows of it being done before and what sort of jetting will be a good starting point? I've done heaps of searching with not much luck, seems likes it's done a little in japan.

dat2kman:
Ina Japano Mr Garetho!!
Pleasea exeplaina FCR41 ??

I thought, hhmmm, a new carburettor type here!

Gareth. J.:
Sorry I should've put in the full name  :)
Keihin FCR41's.....They are flat slide carbs, no throttle shaft or butterfly so the slide is connected to a common shaft in the top of the carb. Very common on race bikes.

Currently I have 220 or 230 mains in the 42mm Keihin VP on the car, but these are vacuum slide operated and also have a butterfly similar to su's. The FCR's have an accelerator pump on each set.

peter mc:
you need to try them mate and find a starting point , then ask a race bike shop for help with jetting

Gareth. J.:
Hmmmmm yeah thats kinda what I thought.

Might be a silly question but would a bike tuning shop only have a single wheel dyno? Lol.

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