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Old 11-04-2010, 07:46 PM
5-7HEAVEN 5-7HEAVEN is offline
Motorized Bicycle Elite Member
Join Date: Aug 2008
Posts: 1,912
Default Happy Time Expansion Chamber On A GP460 Engine!

I mounted my GP460 engine upside-down on my Scooterguy frame-mount adaptor. That left a LOT of room topside, so I installed a Happy Time expansion chamber system and ran the pipes between engine and the bike's top tube. Everything fit right in there, so I had room to install a 4-liter Happy Time fuel tank.

BTW, the exhaust bolted onto the 460 engine and fit snugly onto the bike frame. Performance-wise, it REALLY awakened this high-rpm engine.

And now it's quieter than a stock muffler.

Last edited by 5-7HEAVEN; 11-04-2010 at 10:17 PM.
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