Howdy folks,,, wasn't sure if I should've posted this in the 640A thread or start my own, but most of the decompression threads I've been reading were their own thread. So here goes. Oh yeah,,, I apologize in advance for my rambling posts, guess I should've been a literary major. About 5 months ago I got a 2003 640A with 24k on it from another inmate. It wasn't the cleanest nor dirtiest bike out there, but it felt like a good runner and had worked on suspension. Starter started making whirring noises last week and found out about starter clutch issues on this forum (thank you all for your info), so I replaced that. Ran fine for 2 days and now it won't start,,, ie; e start won't push engine past TDC. Pulled valve covers off and valves are still at 0.15,,, but found out why my manual decomp doesn't work, it's lobe in the valve train doesn't hit the exhaust valve arm. Lever has full range of motion with no binding. Is there an easy fix for this? Auto Decomp - here's where it might get interesting. This is my third thumper, but my other two were red giant's xr250 and xr400,,, and from my reading and slight riding, the lc4 is obviously different beast. Anyways, I've never really heard what I would think is the auto decomp clack,,, just a loud vibrating heart. Not sure exactly what to listen to/for,,, but I've done the plug out kick and wheel turn to spin engine to listen for it. Maybe I'm deaf and can't hear it, or maybe I'm thinking it should be louder (since so many describe it so often), or more likely mine is quiet because its worn out? Besides the clack sound or doing a compression check,,, is pulling the head and manually inspecting auto decomp on the cam the only other way to verify its functioning properly? Obviously I'm a newbie and as such have probably forgotten some pertinent info. Cheers all,,, thanks for any help.