Over the past few weeks I've noticed my bike losing compression. 2007 with a 290 kit. Still started 1st or 2nd even when hot, so I thought I'd be able to go until the winter before rebuilding the top. Last night I was riding with my dad - after about 20 mins of woods we stopped to take a break. I was in gear, engine off, just before kicking it I heard a faint "ching," didn't think anything of it, went to kick, and it felt like very very low compression. Then the kick would get stuck, very stuck, after a good lock it would become loose once more and would have no compression for several kicks. Then get very stuck again. Then tried to bump start down the hill to the road but no go. I understand its very general but any indication as to what this may be?