Print Page - Compression ratio for S&S 475

Title: Compression ratio for S&S 475
Post by: KiwiRob 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

Title: Re: Compression ratio for S&S 475
Post by: To The Max 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.

Title: Re: Compression ratio for S&S 475
Post by: KiwiRob on February 13, 2020, 04:13:05 PM

Thanks Max, I was planning to swap in 0.030 HGs, plus shaving the heads. - Rob

Title: Re: Compression ratio for S&S 475
Post by: Hillside Motorcycle on February 18, 2020, 01:40:48 AM

We run that at 11.

Title: Re: Compression ratio for S&S 475
Post by: KiwiRob on February 18, 2020, 06:37:41 AM

Thanks Scott - Rob

Title: Re: Compression ratio for S&S 475
Post by: Hillside Motorcycle on February 19, 2020, 04:00:28 AM

Quote from: KiwiRob on February 18, 2020, 06:37:41 AM
Thanks Scott - Rob

Yes sir. :smile:

HarleyTechTalk

Technical Forums => Milwaukee-Eight => Topic started by: KiwiRob on February 13, 2020, 11:28:18 AM