Guys your help here would be deeply appreciated. I am trying to troubleshoot a 2005 250ex that has great compression (190) and I have just changed the valve seals and re-assembled the motor. Prior to my work there was a smoking problem upon acceleration. Now that I am done there was no smoking upon re-start and initial run. Then I changed the oil and the smoking started again. The engine runs real strong and I find it hard to believe the rings could be bad. This is a four stroke motor.

Any help will be appreciated.

Superintendent

 

put some clean oil down your spark plug hole if the compression goes up you got bad rings if it doesnt go upits soemthign else prob bad valves i have the same problem but mine doing the same thing kinda but it onlt has 60 lbs compresion but runs llike brand new after a new 10over pistion and new rings

 

Ryan, thanks for the input, I am going to take the head and cylinder to the local shop and have the guides changed and have the cylinder measured to see if I need to go oversized.

Thanks again, Superintendent