least expensive bicycle engine modification for performance

i drilled a couple holes in the pipe that goes through the muffler. made it a little louder but didnt notice any change in performance

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okay lawn mower muffler LOL

Hi all, any piston engine is merely an air pump. Efficiently bringing in the right amount of air, and then discharging it is primary.

"Port Matching" is easy and cheap with a simple tool like a Dremel.

Cutting on the factory mufflers will only make the engine noisier, has been my experiance. Sadly, the extra noise makes most people think that power and speed has increased, when in most cases only the noise has.

The Poo-Poo pipe MAY improve performance, if not, it certainly sounds better to me (I've got a couple left).

The big carborator CAN improve idle, midrange, and top end a bit, and even if the bike is not faster, you can do a much better job tuning. (in stock also).

A colder plug almost always helps 2-strokes.

Tuned exhaust works, but typically is set for Low, Mid, or upper, at the expense of the rest of the Power Band.

Low to Mid is more important to the function of these bikes, since most have no shifting abilities.



Mike

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So back to the lawn mower muffler. If I chop off the stock muffler and weld the intake to a lawnmower muffler and attach that it won't make any difference at all. Cool

Course it will look like crap.

HI Deacon,

I suppose in a restrictive exhaust system, drilling an additional hole or enlarging the existing hole would help but it appears that the stock muffler is adequate in terms of flow (of course assuming the baffle is cut per Dax instructions).

I believe Red did a test of the new High performance muffler from Dax and did not find any performance increases (the new muffler had a larger diameter header and exhaust opening).

A properly designed/made tuned exhaust/expansion chamber is the exhaust of choice when looking for performance increases.

Andrew

My ears perked up - where are these instructions? Thanks.

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they are on dax's web site. i did the mod and all it did was make then engine louder. i saw no change in power

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Here's a easy mod but might not work for you have to make sure you don't let the piston hit the head and yes the pictures are out of focus go from .032 gasket to .012 gasket/leonane/stock032headgasket
http://i265.photobucket.com/albums/i...headgasket.jpg

Here is whats in a 80cc kings muffler. You can drill more holes or cut off the 1/2 pipe will make more noise and as for perf?

Her's what inside some 70cc mufflers with just the center bolt. the 1/2" pipe's been cut off I layed a 1/2" pipe beside it so you can see what it should look like before its cut.