loose spark plugs

[riderboy]

Thanks for all the help.

Finally got a chance to ride at the dunes again and I am still having the same BS problem with the spark plugs coming loose or seperating. I have the timing plate set at 4 and dyna on stock setting and running 100 octane race gas. For the most part it just does it when I am drag racing. But it only take about 5 or 6 passes before one of them come loose. Don't know what else to do. Very tired of screwing with it. Also think it should be a lot faster. My buddy has relativly the same carbs, exhaust, 19cc domes, stock cylinders, weighs 100Lbs. more than me, and runs 91 octane gas and he beats me by 2 or three bikes every time. I am very disapointed that I spent a bunch of money on this CUB Cyl. and can't get it running very good. I love drag racing but getting very frustrated. Need advice be fore it blows up. Please. Could it be something to do with the way the domes are shaped.