Muffler Crank Pedal Clearance

[danlandberg]

If they would weld the muffler to the header pipe at a different degree, there would be no peddle to muffler clearance problems, but on some frames there may be a down tube to muffler problem. I have ran into two builds with peddle to muffler problems. I changed the crank arms from another bike which had a slightly wider peddle stance. One build the header/muffler pipe wouldn't even line up with the cylinder with out hitting the down tube. Quality control failed to catch the defective muffler before packaging. (I thought it strange for GRUBEE). If you have a three piece crank it should be easy enough to swap arms.

 

[butre]

you can take a chainsaw file to the stud holes in the pipe and rotate it a hair. an eighth of an inch in the holes equates to a pretty significant movement where the crank would hit

 

[Hello Moto!]

You could also saw off the muffler and have a 3" straight pipe lmao!

 

[KCvale]

Hehehe..
All I have to do in most cases is just use a drill to elongate the pipes flange mounting holes so you can turn it, I even have a shop name for it, 'reamy-reamy' the pipes holes ;-}

It won't always work, but it's easy to do and won't hurt a thing.

 

[danlandberg]

I've inlongated the holes in the flange on a couple of builds, it helped, but not always cured the problem. They just need to rejig to change where the muffler is welded to the header pipe. The muffler inlet is off center. We all don't have a welder handy to do it right.

 

[KCvale]

I've inlongated the holes in the flange on a couple of builds, it helped, but not always cured the problem. They just need to rejig to change where the muffler is welded to the header pipe.
The muffler inlet is off center.
We all don't have a welder handy to do it right.

So true.
That however brings getting an X-chamber exhaust in to play...
If you have to speed money on the exhaust, might as well get a performance boost from it.

 

[danlandberg]

So true. I agree 110%.