Not sure on year 300ex

Blasternoob13

New Member
Feb 1, 2014
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I bought a 300ex on a 250x frame I have spark but will not fire not trying to tear the top end off unless I know it's rings / piston
 
Hard to start can mean low compression , set the valve clearances ( intake and exhaust ) and then check and adjust the decompressor cable ( if used) and finally the engine compression.