universal china Scooter mufflers?  By  vintagepgogod123 (Read 833 times)

Vintagepgogod,

Welcome to the site!

I rode a Chinese 150 GY6 scooter for 7 years, and probably learned more about them than I ever wanted to... LOL! The exhaust systems on most of the 150's use a muffler very similar to this one. (It's interesting it's listed as for a 2-stroke) but I'm sure it's very similar to the factory 4-stroke generic muffs like you already don't like...  Not bad for the money though!

While these mufflers are not known for long life, they are not all that bad where breathing is concerned. The REAL problem is the HEADPIPE which is usually SMALLER than the exhaust-port. That small pipe-diameter chokes the breathing right at the exhaust-port, where it aggravates the breathing problem the most.

When my stock muffler went south, I made a full-diameter header from an old John Deere generator header (much easier and better to simply BUY a full-diameter pipe off eBay...). Then I fitted up an old 2-stroke "chamber" muffler which I had on hand.





4-strokes run GREAT with a chamber pipe. However, any decent free-breathing muffler is good. If I was doing it again, I'd just buy a matching header and muffler as a unit.

The muffler you are interested in would probably run very well WITH a larger-diameter header. The header is the main obstruction with these. The engines DO require at least a small amount of back-pressure. A straight-pipe seldom runs as well as a decent muffler.

With my setup, I found the engine ran cooler, and was easier to adjust and tune over all rpm ranges. I did have to richen the main carb jet... But I attribute that mostly to the larger header.

My advice: If possible, save your pennies and get a matched large header and muffler as a unit. They are a little expensive, but usually polished stainless and well made.

Hope this may help,

Leo in Texas

PS: If your budget is very tight, I'd go with the "universal" muffler (or auto glass-pack "Cherry-Bomb" type, or large-displacement industrial engine muffler) BUT buy, or make, a 1" header for it.  You can find 1 1/8" exhaust flex-pipe at RV stores for generators to connect from header to muffler.  You'll probably have to do a little back-yard engineering to make a mount (or mod your existing mount) but it's worth the effort.

Sounds easier to gut and rebuild my old muffler have my own name stamped on new sheet front plating, I have a stock sealed muffler but like I said to multiple people (I do not any police attention.) 

That technigas is a upgrade between 90s-2k new PGO USES TECHNIGAS stock but my 87 stock is based off honda sprees old muffler style but longer.


My reeds im tearing out after i plate and tab it, i believe my piolet is not the issue, but i need to do preformance drive train through mallosi, the reeds have 18 years use on them of 28 years. A good set of carbon reeds should re calibrate my splooge issue vs shrinking piolet jet i have a type 35 keihin clone carb. The piolet shouldnt be any bigger then 36 based of the genuine stock carb for now i need to get her moved away and plated so i can be by it at least.


No one ever said splooge kills a scooter which is why 2 stroke is the easiest to clean via induction of seafoam every so few months.