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Briggs & Stratton 9FB Question

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Author  [Modern View]

01-02-2021 15:39:48

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I am working on a Briggs & Stratton 9FB engine that came out of a Bantam Tractor that I have. Can anyone tell me what the ring gap specs call for? I took off the compression ring and took a measurement & got 0.25. I found a old Repairman's manual online for older Briggs engines and the 9FB model is listed. It is saying for compression rings 0.30 or bigger should be rejected. What should the normal gap size be for this engine? I am thinking I may need a set of rings to go back in it? Can anyone help me out?

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01-02-2021 17:30:30

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 Re: Briggs & Stratton 9FB Question in reply to Joe120, 01-02-2021 15:39:48  
Thank you for the reply. Thank you for that valuable information as well, I was not aware of that but now I know. So it sounds like by my measurements that I need a new set of rings if everything else measures out correctly.
So basically in a nutshell .007 to .010 would put me in the ball park. The hone of the cylinder is 2.25.

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denny k

01-02-2021 17:14:17

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 Re: Briggs & Stratton 9FB Question in reply to Joe120, 01-02-2021 15:39:48  
B & S recommends .012. I have always used .004 per inch of bore. 4"= .016. Google is your friend. Try it sometime.

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