20 Most Recent 2009 KTM 250 SX - Page 4 Questions & Answers


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KTM Motorcycles | Answered on Dec 21, 2019


It's a bad seal of the head gasket. You need a new head gasket and to scrape every particle of debris from the cylinder head and cylinder surfaces that mate with the head gasket. Use the factory specified gasket sealing compound and do a clean job - no blobs or pools of the stuff. The head gasket should lay flat on the surface of the top of the cylinder, and you have to make this surface free of grit, leftover sealant and any other foreign matter before you put the head in place and torque it down. Start with the head bolts just finger tight and then go by the manufacturer's specs for the pattern and amount of torque to be applied. Usually it is recommended that you get to the specified torque amount in stages, going around several times and repeating the torque pattern until you get that maximum rated amount. This will prevent the seal from shifting or warping and should make the gasket seal perfectly. This is the old school method of doing this job. and I have never seen this fail to produce good results. Take your time, be clean, and you will have the results you want.

KTM Motorcycles | Answered on Dec 31, 2018


over full sump
fuel getting into sump
badly worn rings allowing excessive blow by

KTM Motorcycles | Answered on May 05, 2018

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engine stops when throttle opened also

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