FMF Q Stealth

[rzide]

I have the fmf q stealth that came on my bike. Does it have a removable spark arrestor? I would like to inspect it to clean it and possibly run without it for days when I can only get to a track. I didn't want to undo all the bolts as if i was to repack it so I figured ask first.

[iamovru]

You have to drill the rivets and repack it. Then re rivet it.

[Neil E.]

The spark arrestor is a "Krizman bullet" type. It makes the exhaust swirl into the rear cap of the muffler. It is not easily removable and the passageways are large enough that it would take a long time to foul.

About the only worthwhile change would be removing the rear end cap and shortening the tube weld into the cap. This long tube projects into the back of the "bullet" and creates a significant flow reversal. With the tube shortened the Q Stealth should function well in terms of flow.

Some people who don't like the bulk of the Q Stealth have shortened the body to make it more compact. I don't know if any of those folks also reduced the rear tube length or removed the "bullet".

[djroggen]

I shortened mine by about 3 inches. Maintained everything inside, just took 3 inches out.

[djroggen]

Pretty simple project.

[sevenfourate]

Originally Posted by djroggen

Pretty simple project.

Looks GREAT !

How did shortening it effect the sound ?

[djroggen]

Thanks!
Seems like a very similar sound. I cleaned it out for the first time in 150+ hours and I have to say it is not a spooge trap.

[celler]

Originally Posted by djroggen

Thanks!
Seems like a very similar sound. I cleaned it out for the first time in 150+ hours and I have to say it is not a spooge trap.

I shortened mine about 4 inches. Still a similar sound. No spooge ( I never really did have an issue). I have about 800 miles on it. a big reason I did it was I can actually use the excellent rear sub frame grab rail to lift the bike. I think FMF may have a real great product on their hands "Shorty Stealth Q". I like my modified Stealth way better than my turbine core 2 on my other bike.

[twowheels]

Originally Posted by djroggen

I shortened mine by about 3 inches. Maintained everything inside, just took 3 inches out.

Dustin, did you relocate the spark arrestor components?

[djroggen]

Yes, I cut the end off the outer portion and measured where the holes were supposed to be. Then drilled new holes and riveted the inners. I cut the inner perforated portion and shaped it to fit the shorter length. I should have taken photos...