rick0000 Posted April 11, 2009 Share 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 Link to comment Share on other sites More sharing options...
wild foamy Posted April 11, 2009 Share 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 Link to comment Share on other sites More sharing options...
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