Had about 1/2 hour today to wait for customer to come pick up repaired bike, so took one of the new bikes out to run in a bit. This one only has about 3 miles on it. Hopped on and rode till it started to slow up a bit, and as I was thinking; "I should have put more gas in it", it started to get REAL noisy too. Looked down & motor was jumping up & down & leaning left. After years of telling customers that they need to always check motor is tight before riding, I forgot it. Limped home slipping clutch & holding motor with my foot : ( Tightened it up and all was good. These kits are called PK-BOOM in typical chinese naming fashion, but I'm really thinking the 'angry bumblebee' would be better as they really haul at WOT and sound great. may have to stock up on 36T sprockets as the low end torque should take it easily.