I bought a "new" grubee kit on a bike from some jerk on craigslist. claimed it was just barely broken in and just needed the chain connected. had my brother go pick it up while i was at work. turns out its an old used engine and was NOT assembled hardly at all. long story short, he did some terrible work mounting the engine (crushed the frame to fit u-bolts) and i finally just finished setting it up tonight. going to try and get it running tomorrow. heres my issue. The chain is VERY tight. at first, it was either really slack on the top, and then i would adjust it, and it would get very slack at the bottom. needed just ONE link to be removed, but of course they must be removed in pairs. so i removed the pair, couldnt connect it to the rear sprocket, so i took of the back wheel, and hooked it to the rear sprocket. then put the wheel on. now its very tight. when i release the clutch the rear wheel locks up. does the tightness of the chain have anything to do with this?