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View Full Version : HMF Exhaust/FCR carb jetting


pnut420
11-06-2003, 05:49 PM
I just put my HMF on and it seems to be jetted way to rich. I think I have a 158/42 in there right now. It was pretty close with the Sparks exhaust, but not with the HMF. The HMF seems to be wayyyy quiter also. What you guys think I should try jetting it at? This is a stock engine, airbox lid removed, K&N Filter, FCR39MM carb.

Thanks,
Kevin.
ThyJuGGaLo
11-06-2003, 06:17 PM
what are you riding?
pnut420
11-06-2003, 07:36 PM
OMG, thats helps. Im used to most people knowing what I got. Its a 400ex.
silverbullet300
11-06-2003, 08:36 PM
go to hmfengineering.com They might be able to help you out but not for sure.
hook
11-06-2003, 08:40 PM
he!! u run a 170:devil:
pnut420
11-06-2003, 08:43 PM
Cool cause on their site its says 200 and I know thats not right, maybe a stock carb.
pnut420
11-06-2003, 08:48 PM
My pilot is a 52 right now and i have a 168 I can try for now, a 158 was in there.
silverbullet300
11-06-2003, 08:52 PM
hook-sorry not the brightest bulb in the pack. forgot that the jets are different sizes from different manufactures
hook
11-06-2003, 09:19 PM
sorry i thought u was talky about a stock carb:devil: i run a 175mn in a 41mm
pnut420
11-06-2003, 10:33 PM
Im going to try a 168. The higher you go what does that do for you. Like from a 158 to 168, leaner or richer?
hook
11-07-2003, 11:48 AM
higher #is richer