Originally Posted by
B-rup
Built a couple of 636's, so this isnt my first time. I took a motor out of a mint bike a couple months back to put in my stunt bike, me and a buddy (who has rebuilt TONS of 636 motors) put a bottom end that was good with a top end that was good together. Its timed right, its got spark, its getting fuel, 120+ compression on all cylinders (a bit low, but should still run), cranks over just fine, but will start.
We are stumped. Nothing has been modified or changed, and the bike ran when I rode it home back in November. Checked all obvious sensors, crank, cam, etc (even though it wouldnt spark if those were broken). Rechecked the timing......any ideas of something we may not have checked?
engine needs 3 things to run. spark, compression, fuel. sounds like you got 2 outa 3.
so its either fuel or maybe you have your timing 180 degrees off
