I f***ed up my big bore and now my bike is garbage. - Page 7

ChopperCharles · 05-10-2021, 12:45 PM

The cylinder bore and piston diameter are the same - 82mm for the big bore kit or 77mm for the stock cylinder and piston. The head just has a domed area where the air/fuel mixture is compressed. It's probably a little less efficient having the lip there, but we're talking fractions of a horsepower. Nowhere near enough so to offset the added power from a bigger piston.

Charles.

ChopperCharles · 05-10-2021, 10:45 PM

Oh god I’m SO happy to be riding this bike again. Planning a Memorial Day trip now. I’m stoked!!

Charles.

05-10-2021, 12:45 PM	#91
ChopperCharles Join Date: Feb 2018 Location: RDU, NC Posts: 677	The cylinder bore and piston diameter are the same - 82mm for the big bore kit or 77mm for the stock cylinder and piston. The head just has a domed area where the air/fuel mixture is compressed. It's probably a little less efficient having the lip there, but we're talking fractions of a horsepower. Nowhere near enough so to offset the added power from a bigger piston. Charles.
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05-10-2021, 10:45 PM	#92
ChopperCharles Join Date: Feb 2018 Location: RDU, NC Posts: 677	Oh god I’m SO happy to be riding this bike again. Planning a Memorial Day trip now. I’m stoked!! Charles.
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