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Hi guys I'm new to this forum. I had recently purchased a 2002 zx50 super fever. This thing is driving me crazy. Here is the scenario. Purchased this thing not running. Well would start for a few sec and then die. Cleaned card like 3 times and sorta eliminated carb being dirty. I checked compression and has 195psi on a few kicks. Changed spark plug it now starts and idles. Anything over 1/4 throttle and it seems as if I hit the kill switch. When its cold and you rev it, it sounds like a very choppy rev limmiter. Wot same when warm. Could I possibly need a hotter plug? I have a br8hsa in there now.  Maybe hotter plug? I purchased it with a bbk stroker crank variator weights (rollers) ( 3pink/3orange).  Now that I'm thinking about it maybe gonna try a hotter plug. If anyone has other ideas please chime in. If the plug doesn't work than I'm out of ideas!! Thanks in advance!!