Oil Scraper Piston Ring Gap

danfr

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Joined

Oct 17, 2012

Messages

138

• Nov 13, 2021

• #1

Hey all,

I’m installing some +0.040 Hepolite rings on my 750 Commando. I can’t seem to find a spec for the bottom oil ring gap. Gap is currently at 0.009” out of the box.

Cheers
Dan

 

Onder

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Joined

May 11, 2010

Messages

4,264

• Nov 13, 2021

• #2

I think it should be at least ten....

 

concours

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Dec 29, 2011

Messages

9,444

• Nov 14, 2021

• #3

danfr said:

Hey all,

I’m installing some +0.040 Hepolite rings on my 750 Commando. I can’t seem to find a spec for the bottom oil ring gap. Gap is currently at 0.009” out of the box.

Cheers
Dan

Click to expand...

What does the gap measure on the top & middle rings?

 

Dan1950

1974 MK II Roadster

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Joined

Aug 19, 2021

Messages

1,456

• Nov 14, 2021

• #4

Rule of thumb is minimum .003" gap per inch of bore.