after my failed attempts to remove the flywheel i said the hell with it and put it all back together to ge ready for this weekend. took it for a test spin and aobut half way through the power band it cuts out and pops through the exhaust, also does it if you free rev it . the rest of the time it runs like shit and wont idle. i was thinking i possible cracked a magnent but they look fine from what i can see. It is about 20 degrees cooler out than when i last rode it. would this cause it to be too lean and cut out? i am going out now to check on what jets are in it, what size should i go up to?