Do I need a muffler?  By  Deleted (Read 2,050 times)

Some communities have noise ordinances you may check yours first. Also yes keep an expansion chamber like said above. Eliminating weight is a good way to go faster, so its a good thought. Any change to your exhaust though will change the way the engine breathes I would keep a close eye on my plug after any modifications.

Your exhaust valves will not suffer a thing for as long as you have at least an exhaust pipe of 2ft out of the engine.
Running without muffler would give you the best speed increase, as the back pressure will be nearest to zero as it can. however, your, and the people around you's ears will ring.
Any engine, even a 50cc engine, running without some sort of sound damping will damage the ears.

And in many places it's illegal to run without muffler (or some way to reduce the noise).

My suggestion, find a large diameter performance exhaust made out of aluminum. Those won't rust or corrode easily, and damp the sound better than smaller ones; while at the same time allowing better airflow.

This is what happened to a friends scooter who rode around for two months with no muffler . The end on the exhaust valve burned off and ate up the piston and cylinder

Skuttadawg that scooter had to be so lean it wouldnt run no?

I think if my scooter ran fine with just the pipe from the manifold to the flange it should be ok.

I know plenty of Harley riders with no muffler but they have long pipes and the carb upjetted . If you take off the muffler it has more flow thus will be lean without upjetting and ruin the engine . The pipe is to remove heat away from the head . My buddies bracket broke as he was jumping speed bumps and he later got mad and ripped the pipe off . He did not upjet it thus it was very lean and ran hot thus fried the engine

I may do that but Im out 2 brand new exhausts as of now.

At least with the Jonway exhaust the muffler can be detached.