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Santa Clarita, CA
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581st
Edited Date/Time
9/30/2018 9:46am
I bought a used bike and am trying to get it all dialed in. Previous owner had installed an FMF Gnarly pipe and FMF silencer, but had made his own pipe mount brackets and pipe was sitting all crooked in the cylinder. (He hadn't ridden it, since taking it apart to powdercoat the frame)
So I bought the correct OEM pipe mounts to get things lined up, but the pipe hit the frame on the left side (front frame rail) the pipe appeared to be brand new, but because it would not line up, without hitting the frame and had a strange shape to it, I decided to order a brand new pipe to get this thing together. Thinking maybe it was the wrong pipe for my bike. (The flange barely enters the cylinder, you can see the o-ring when the pipe hits the frame, a good 1/2” or so too short)
The new pipe is exactly the same and confirmed that the pipe that came on the bike isn't bent at all, but just an awkward bend in it up front. But my problem is still that the flange on the pipe is not long enough to reach into the cylinder. Am I missing something here ? Any help would be appreciated.
So I bought the correct OEM pipe mounts to get things lined up, but the pipe hit the frame on the left side (front frame rail) the pipe appeared to be brand new, but because it would not line up, without hitting the frame and had a strange shape to it, I decided to order a brand new pipe to get this thing together. Thinking maybe it was the wrong pipe for my bike. (The flange barely enters the cylinder, you can see the o-ring when the pipe hits the frame, a good 1/2” or so too short)
The new pipe is exactly the same and confirmed that the pipe that came on the bike isn't bent at all, but just an awkward bend in it up front. But my problem is still that the flange on the pipe is not long enough to reach into the cylinder. Am I missing something here ? Any help would be appreciated.
(First pic is one of the brackets that were holding the pipe on, I threw the other one away by accident, but it was similar, but slightly bigger.
The Shop
I would stick the pipe, wrapped in a towel, in a vice by the exhaust flange and tweak the whole expansion chamber out, so the flange will sit farther in. It’ll be some SERIOUS doing, but I think you should be able to tweak it just right.
If not, I would contact FMF and doublecheck part numbers and supply them with the pics and issues you’ve ran into. Maybe they sent both of you the wrong pipe or list the wrong pipe for the bike. I can’t imagine too many people buying a Gnarly for that bike tbh, so that could be the issue. Or it could be an issue that the pipe is for another bike and they figured it’d fit yours.
Edit: according to all the skidplates I’ve looked at, they are listed for the MXC and the EXC, as is the pipe. Maybe the cylinder flanges are different from bike to bike?
Maybe there is supposed to be a dent where the pipe hits the frame in order to clear it? Either the flange isn’t in the correct position, or the expansion chamber isn’t and needs to be tweaked. I’d let them handle it if you have the patience.
https://goo.gl/images/qu6YGP
Thanks for that link, I might end up just saving the gas and time driving down to FMF and just get busy on bending mine to fit. That video sure looked easy. Ha
Anyways I have a 200 and I've always had a hell of a time with pipe fitment. The do bend back easily on the stator side if you fall so I'm sure the pry bar technique will help. Then the back mount weld is weak, mine actually busted off. Let us know if FMF says anything.
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