at the end of last year i blew my 01 super sport 550 up, i cracked the skirts right off the pistons. well i got all the metal out of the crankcase and put a new top end kit in it, did stock pistons and rings because the cylenders didn't even get a skuff on them. it has 120 psi in each cyclender now and idles fine and takes of fine, but it will only reach 30 on the speedo. it doesn't even feel like its doing 30. i don't kow what i did wrong, or wear i should start looking? anyt help will be great.