Stock jets on FS650

fish · Sep 13, 2005

Hi people,

I am having trouble starting my '02 fs650.
I've tried all in the hard start guide and all seems to tie up.
I have the fuel/air mixture screw 1 1/2 out and it tried to fire! but the only way I could get it to pick so it would tickover is to increase the ticker over until it fired and ran but at about 2500-3000 RPM(est).

I've cleaned and checked the carb and all looks ok. but I was wondering about the pilot jet as it is a 35 and the manual says it should be 40.

The jet sizes are:
MJ 190
Pilot 35
Start 45
Needle is K51 with clip 3 from the thick end

Not knowing much about carburation can someone help out?

Cheers
p.s. PHM40

Maddel · Sep 13, 2005

Hi Fish,
the jetting seems to be stock (if the needle jet is DR 272) except for the
pilot jet wich should be 40 as you wrote. I would not change back the 35
pilot to 40. Low/midrange throttle response is much better using the 35
pilot. I use this jeting and the bike starts and performs awesome...

If you checked and cleaned the carb I guess the jetting isn't the major
problem. I only experienced some starting problems when the idle speed
(screw) and/or the air mixture screw were not properly set.

If the bike won't idle correct there's a good chance that some debris is still
in the carb or the intake system is leaky. To make sure the bike doesn't
"breath bad air" check out the connections intake-port/intake-manifold/carburettor.

Hope this helps,
regards Maddel

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Stock jets on FS650

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