Question: I am not using the muffler extension that came with my engine. I have installed the muffler directly to the engine crankcase exhaust manifold but I am having trouble getting the muffler to fit tightly. What can I do about this?

Answer: Place two washers under each muffler bolt and retighten the bolts.

Better Answer: When you are using the muffler without the extension, the bolt holes in some of the mufflers may not be quite deep enough to accomodate the full length of the threaded bolt. This is not common but has been found in some mufflers. The fix is easy. Simply install two small washers beneath the head of the muffler bolts to reduce the effective length of the muffler bolt. Re-install the muffler bolts and tighten snugly. Do not overtighten the muffler bolts or you will strip the muffler holes or the bolts themselves.