I have threaded no 1 cylinder the spark plug had taken all the threads with it .i have taken the cylinder head of and also noticed the head gasket was blown also some fine scores on my bores . I only fish in shore so i have taken all the carbon of and just putting a new head gasket back on i also use a back up 4hp engine , . when i put the head gasket back on it should run OK the only thing is that i will loose some power because of the scratches on the bores i can just feel them with my nail just slightly if i am wrong about this please let me know . i am going to put a spark plug insert in the hole but i don't know what size i need .i read on the net that is is a m14 1.25 if any of you can conform this then i will get it .thanks .the local garage does not know the size that i need
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