The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: Drew Back on 14.12. 2016 01:00

Title: Cylinder Bore
Post by: Drew Back on 14.12. 2016 01:00
Ok so I got another A7 long stroke cylinder I know stock is supposed to be 62mm well it measures out to 63.4 mm what size pistons or how much over would that be..I have a .40 piston and it is to big What size should I shoot for? The bores look pretty good now also.
Title: Re: Cylinder Bore
Post by: bikerjohndavies on 14.12. 2016 09:00
Hi Drew, 63.4mm would make it +.060 bore so not sure what you mean when you say a +.040 is to big? How accurate did you measure the bore? For info .5mm is 20 thou or .020
Title: Re: Cylinder Bore
Post by: Drew Back on 14.12. 2016 15:19
Thank you for the imfo I shal take it to the pros to get accurate measurements ..