I will pull the cylinder head off this evening and check the bore for and indication of a soft seized. And yes there is a decompression valve. Which brings me to another question. I replaced the RH grip when I replaced the throttle cable. The old grip has the lever for the decompression valve. Any idea how that small lever comes off? It looks like it just slides into the groves and should just slide out. I don't want to pry with too much force for fear of breaking it.