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Needing some help

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Hey guys my buddie just bought a 05 cr125. He had to rebuild the top end he rehoned it. Well he put it together and the compression is low he said they tried bump starting and the compression was good tried kicking nothing. Its geting spark so my questions are.
 
1. What could cause that?
2. Would the power valve have anything to do with it?
 
Also i could the head cause this?


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Is role starting anything like role playing?  Try roll starting...it's more effective!

Lol sorry in the hospital with my new baby girl and trying to help my friend not really worried about spelling at the moment

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