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chubb22 Added a reply to 08 KX250F - low compression, won't start

10/31/2009 9:26pm
Had similar problem with 08 yz250 f ,started OK ran fine for approx 10 -15 minutes then started coughing + backfiring until stalling and unable to re start noticed low compression....... mechanic pulled it down ....clearances were ok however lot of carbon build up on piston and a bit of this flaked off piston and held a valve open. Cleaned...