Author Topic: Compression ratio for S&S 475  (Read 1728 times)

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Offline KiwiRob

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Compression ratio for S&S 475
« on: February 13, 2020, 11:28:18 AM »
What would the ideal CR and/or CCP be for the S&S 475 in the stock 107, then later will be up grading to 124 when new bike guarantee runs out.........or sooner :SM: - Rob

Offline To The Max

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Re: Compression ratio for S&S 475
« Reply #1 on: February 13, 2020, 02:48:08 PM »
When i put my 475 in my 107 i left the comp alone bike was about two weeks old. it ran great until i stripped it down and put the 124 kit on. i set the comp at 11.1 and its all i need and runs nice on our aussie fuel. if you still want to raise the comp pull the heads and stick in a 30th cometic gasket.

Offline KiwiRob

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Re: Compression ratio for S&S 475
« Reply #2 on: February 13, 2020, 04:13:05 PM »
Thanks Max, I was planning to swap in 0.030 HGs, plus shaving the heads. - Rob

Offline Hillside Motorcycle

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Re: Compression ratio for S&S 475
« Reply #3 on: February 18, 2020, 01:40:48 AM »
We run that at 11.
Harley-Davidson Speed and Service Center.
           "32 years same location."

Offline KiwiRob

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Re: Compression ratio for S&S 475
« Reply #4 on: February 18, 2020, 06:37:41 AM »
Thanks Scott - Rob

Offline Hillside Motorcycle

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Re: Compression ratio for S&S 475
« Reply #5 on: February 19, 2020, 04:00:28 AM »
Harley-Davidson Speed and Service Center.
           "32 years same location."