Print Page - C11G Piston

Title: C11G Piston
Post by: BeenyBoy on 25 Jul, 2018, 10:08

Hi Guys

I've just started the stripdown of my latest restoration project- 1954 Plunger C11G

I've got the piston off- eventually (!) but I cant determine if it is oversize or not- there are no stamps for +20/+40 etc all that is stamped on the crown is

3 D/B and 29-2274.

Inside the piston it is BSA 27-1680

Do I assume its standard ?

Also ...any tips on freeing the rings- the top one is solid

cheers

Title: Re: C11G Piston
Post by: AdrianS on 25 Jul, 2018, 10:19

Can you not just measure the piston? Each 20 thou rebore will put 1/2 mm on the piston diameter.

Title: Re: C11G Piston
Post by: JulianS on 25 Jul, 2018, 10:38

29 2274 is the part number for a bare standard size piston.

Photo from 1951/52 parts book.

Title: Re: C11G Piston
Post by: BeenyBoy on 25 Jul, 2018, 11:44

Thanks guys

I just need to source a set of new rings- any ideas ?

cheers

BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: BeenyBoy on 25 Jul, 2018, 10:08