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  1. T

    YX 150, hole in head ?

    Thanks guys, hadn't thought of that. The casting was v rough around the edges and looked like something had punched thru. Great forum, I'd thoroughly searched the net and couldn't find any mention of it. Checked and yep it connects thru To where the spark plug is. Cheers :)
  2. T

    YX 150, hole in head ?

    Hi I recently bought an YX150 engine and...There is a small hole near intake manifold. Can anyone explain what it? I'm puzzled?
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