that usually happens when your running the engine too rich and washing the bores, it can also be a leaky carby/fuel injector as when you turn the engine off it can leak down past an open valve and past the piston rings, gotta be careful mate cause fuel will destroy you oil pretty quickly(will loose its lubricating performance) or it could just be blow-by on ya piston rings, easy to tell just get a comp tester to check that one mate 
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small cubes+big balls= blown tyres!!
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Last edited by TUF 253; 10-02-2010 at 09:19 AM.
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