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Sorry for the long delay,,,,, Here's the update, I checked the valves which were ever so slightly out of round, so I changed them, and all valve in/outer springs, the springs had little tension. Replaced the timing chain and replaced piston rings..... Slight port on the cylinder head with...

Compression at 132psi, tore it down, going to get valves out wednesday, and also going to put new piston rings in while I got it tore down this far. I'm leaning toward broken valve spring or pitted/burnt valve.

Hi everyone, I'm his mechanic....... Anyway, here's the deal, like towtruck stated 4th intake boot! What the engine is doing is small backfires which jolts the carb backwards towards the airbox, on idle its not as bad, but still backfires, running the bike hard makes some serious backfires which...