Agreed with george #1 I run 6 of them on my rear axle, and have never complained and i have yet to have a single thing slide, i just check them after every race and it takes only a few seconds, cheap insurance. Not to mention the two piece aluminium lock collars from BMI karts are only like 1,60$ a piece.

Use a two piece lock collar when you do it jason, they hold far better then the one piece, not to mention you don`t need to slide them on and off. Oh and putting two lock collars on all your hubs and all your wheels is gonna add rotating mass I don`t see why i few preventative measures can`t be made to make sure they don`t go any where, make sure every thing is tight before you race and after each race, only takes maybe 30 seconds with your allen key.

To answer the original question instaling a puke tank will give you more power, now this isn't seat of your pants power but none the less still power,little things add up. The reason for this is because crank case preasure is fiting the piston more preasure there is the harder the piston needs to work to come back down stealing power. So getting rid of the stock valve cover and instaling a flatt plate with brass fiting will help with performance. But this is like the most contrevertial thing ever. Some say it won't work some say it will puke oil etc. I have two brass fitings one in the block and one in the valve area. Both run into the same catch can and then vent. I'm through just about half a season on a brand new (almost) 28 flatty and it barely pukes any oil. And i mounted my catch can above the motor so the oil gets drained back into the block at the end of the race. Just my 0.02, like i said some seem to think other wise and have great luck with stock. But i have don G. motor 101 movie and thats what he said to do and ive been having great luck.

So i miss interprited what george has said..But that was what i was trying to explain

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After reading on a little bit i don't think your motor not running has any thing to do with your carb this all sounds like a fly wheel key beeing sheared. Pull your fly wheel off i'm almost willing to bet its messed up. Because you said it was back firing out of carb, and that some times it would run for a few seconds, sounds like the flywheel is slipping into and out of proper timming.

Yeah thats kinda what it looked like when you where in canada last weekend. To bad we didn't get many pictures due to the rain. But yup those front tires don't need to be on the ground that rolling resistance