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BSA M20 Reassembling a box of bits,

hi just received a new pack of standard piston ring with no info
Which piston ring gap is left vacant and why?
Do the new rings have a right or wrong way up?
Presume the ring with the slot is the oil ring does this have a right or wrong way up?

Any advice gratefully received

email (option): colinandjeangoodwin@gmail.com

Re: BSA M20 Reassembling a box of bits,

The top groove is vacant. The oil ring with slots is in the bottom groove. They would be marked TOP if they need to be fitted that way. The ring gap measured in the bore before being fitted to the piston is 8-12 thou. Ron

email (option): ronpier@talk21.com

Re: BSA M20 Reassembling a box of bits,

Cheers, much appreciated.

email (option): colinandjeangoodwin@gmail.com

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