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The last few I've tossed I had to really rip the cord to start, the few I pulled the heads off because I thought it was leaky valve seats had very little valve lift. Others couldn't start them at all, but a fast enough pull they would start but low power output and if bogged down would die. I had a Ninja 250 act similar when the valves where too tight (the day I bought it).
Had a snapper rider I couldn't keep the head bolts tight and would start leaking. Mice packed the housing with fiberglass insulation. Once cleaned and bolt tightened it was fine.
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