rick0000 Posted April 11, 2009 Posted April 11, 2009 hi i have a wr450f o7 i have just put a big bore piston and cylinder in my bike (athena)when i put it back together it started fine but i had a small oil leak from top of cylinder and head so i took it all apart and tried again there was still a smallleak but slight improvement someone then told me the head might be warped so i took apart again wet and dried head and put back together now it wont start and i can hear a slight hissing from head can any one help pls
wild foamy Posted April 11, 2009 Posted April 11, 2009 air leak at the head = low compression = no starty. shouldn't have sanded the head really, try using a slightly thicker gasket and see if that fixes anything, alternatively i would think you need a new head
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