i have a 07 450er the bike has spark and fuel but it wont fire so i did a compression test and it had 15psi with the decomp on and 50 with it off so we checked timing it was good so wee decided to put rings in and new head and base gaskets without the cam in it we do a compression chek still only has 60psi so then we check for bent vales filled the intake with either and it dosent leak down same for the exhuast side the piston looked ok the jug still had th honing marks on it but ther is one other thing you can put your finger in ther spark plug tube and crank it with cam off and it wont blow your finger out i have no idea whats going on please help me

jake, periods and commas to make it easier to read. lol

Someone help him, he missed a good ride today because of this


-Mark

[quote name='deer' date='Oct 25 2009, 09:24 PM' post='726487']
i have a 07 450er the bike has spark and fuel but it wont fire so i did a compression test and it had 15psi with the decomp on and 50 with it off so we checked timing it was good so wee decided to put rings in and new head and base gaskets without the cam in it we do a compression chek still only has 60psi so then we check for bent vales filled the intake with either and it dosent leak down same for the exhuast side the piston looked ok the jug still had th honing marks on it but ther is one other thing you can put your finger in ther spark plug tube and crank it with cam off and it wont blow your finger out i have no idea whats going on please help me
[/quot did you check timing to make sure it did not skip,maybe a valve is stuck open! you definitely are losing it some how!