This is a bike I used a lot in the mid '80 to '92. Then again a bit more 2011 to 2015. I then ripped the M20 sidevalve motor out and started the changes to where it sits now. The bike was not a matching number and I have sourced an M20 frame for the original engine for another bike. The motor has an M21 114 stroke? crank which needed some work to the timing side axle. I found a new pin and a suitable length rod. It uses a B33 piston. I will now be able run good lights with the alternator primary, Thanks for watching My website bmcmotorcycles.com I have at least 20 articles I have written of my experiences repairing and building Brit bikes.
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