Originally Posted by mapbike
Are you using engines with the pull starter?
Much of the time the muffler tube has to be bent a little in order for it to clear the pedals.
What type of bikes have you been using?
I have a motor on an old mountain bike and another motor on a newer Huffy beach cruiser, I had no major mounting issues with either.
I saw an under the car tire vise to hold the muffler , while an good strong long pipe was put down in the tail pipe ... and bend it like an pretzel if you like... wish i had thought of it ...cant find it in search yet.... but yall might be able to find the post