jetting for fmf??

scooby61 · Feb 22, 2005

hi i just got into 2 strokes recently and have a problem with plug fouling. i don't foul them too often but i get some spooge and have a dead spot about mid throttle. i have the factory jetting chart but my bike has a fmf fatty and power core two pipe. do i need to go a step richer or leaner to compensate for the pipe or does it not make a difference? :bang:

sick 96 250 · Feb 22, 2005

go to fmfracing.com and that will help you, look at the tech center then go to jetting

scooby61 · Feb 22, 2005

thanks i'll try that

Mike_socal · Feb 22, 2005

Also keep in mind their jetting specs are with 50/50 mix of pump and race gas.

gonzo843 · Feb 23, 2005

I put a Factory Fatty and shorty on my 125. I had to lean the pilot 3 sizes the needle 1 clip and the main was ok and I am riding in 40 degrees. You dont need to richen if your fouling plugs. You need to lean everything out. Go one size at a time till you get it right. FMF's jetting on their site is for stock bikes.

sick 96 250 · Feb 23, 2005

There jetting always seemed to work for me on my bikes. I couldn;t get the jetting correct on my 96 rm250 with fmf pipe, rad valve and carbon fiber reeds, once I put there recommendations in it stopped smoking and kicked my butt a few times. I was using 93 pump gas also so in my book there pretty on point, may need to adjust a little but its somewhere to start

gonzo843 · Feb 24, 2005

If you notice their jetting specs are just about what stock is. Most of the time they are the stock settings.

sick 96 250 · Feb 24, 2005

Arent there jetting specs with there pipes on them, I think thats what it says...... Maybe not tho

gonzo843 · Mar 1, 2005

It doesnt specifically say it's for their pipes. Also some of the pipes could require different jetting from others. Like it says they are starting points for jetting.

jetting for fmf??

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