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Check the bolts that hold the head to the block. You will probably find one is not tight. Tighten the bolts and your problem will be fixed...

I rebuilt the carb. New gas new plug etc. no help.. When I finally tightened the 2 bolts that hold the head to the block all was fixed. Try it and I believe your blower will start...

If the bolts that hold the head to the block are lose it will not start. That was the trouble I found on mine. I would check this before I spent money or more time looking...