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Message: <blockquote data-quote="snowflake" data-source="post: 166473" data-attributes="member: 152">1.) Valve Lash2.) Compression test3.) Pressure test the cooling system (ossagp has posted how to do this elsewhere, if you pressurize the engine through the spark plug hole you should not have air hissing at the radiator) this will tell you if you have a bad head gasket.4.) Check timing, if the timing is off being hard to start would not be the only symptom, once it was running it would run very poorly.and for the love of all things good make sure you didn't just leave a rag in the air boot <img src="https://www.dirtbikeaddicts.com/static/images/smilies/tongue.gif"  class="smilie" loading="lazy" alt=":P" title="Tongue    :P" data-shortname=":P" /></blockquote>