Update: I got the barrel off by loosening all engine mounts, removing the two smaller mount bolts and rocking the engine back slightly. Piston measures 66.5, but i assume that is my crappy cheap verniers - with no markings on the top of the piston, I believe it to be original 66.4. The bore looks gr...

CRMs are much harder to work on than MX bikes but you should try fixing an MTX!!! Easiest way to get the cylinder out is to remove the head studs. I hear ya! It's not the head studs making life difficult on the AR though - it is the exhaust studs on the front of the cylinder fouling the frame. I'll...

CRMs are much harder to work on than MX bikes but you should try fixing an MTX!!! Easiest way to get the cylinder out is to remove the head studs. I hear ya! It's not the head studs making life difficult on the AR though - it is the exhaust studs on the front of the cylinder fouling the frame. I'll...

Hi all, No luck with starting the after re-checking all the vacuum pipes, so it is top end strip time. I've removed the head and the piston has no bore/sizing marks on it, so I assume it is standard. Not been able to measure it yet. I thought i'd read on here that you can remove the cylinder with th...

Should still run and rev with 110 psi. Was the test done with the throttle fully open? How does it not rev? Bogging? The score doesn't look too bad, I've had bikes which looks far worse up there and run half decent. What's the rings look like further up the piston? Might be worth checking vacuum pi...

Actually i lied... feeling again, i can feel the score mark with my nail. I guess that'll do it, right?

https://photos.app.goo.gl/MjDFTb7vsDDghuFu9

https://photos.app.goo.gl/c5vCKynDQ3rasqCE8

Hi all, jumping in on this thread if i may... My CRM AR had been faultless for years, but has become hard to start. It tries to start after initial 2-3 kicks, runs for a couple of secs, wont really rev and then cuts out. Spark is good I've tried easy start - can't get it to fire on that Stripped and...