Big Boy Expansion chamber exhaust.
Gru-Bee designed this expansion chamber exhaust many years ago, now others in China have copied it. No intellectual property protection in China!
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BIG BOY measures 12.5 inches overall from flange to exhaust tip
This is a YuanDong SkyHawk manufactured muffler. I was amazed at watching the ladies acetylene weld these on the shop barn floor.
On YD'S dyno a 66cc engine muffler did produced 10% MORE TOP END POWER.
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Is it quiet? No, she's one loud puppy.
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Will it fit all 2 stroke China bicycle engines? Yes it will.
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Will it fit on all bikes, No it will not.
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Get an idea what it will fit by looking at the pictures.
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Big Boy Measures 12.5 inches over all; flange to exhaust tip.
Buy 2 at no additional shipping cost and sell one to a friend. Comes with exhaust gasket.
FYI: 2 stroke engines produce more power with an expansion chamber exhaust system. Very Loud! Not a quiet street muffler. Best for performance requirements like flat track or street racing! This is what you need to have the Bad Boy on the block image!
