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Frankenquad

88 Suzuki lt4wd 250

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Trying to resurrect a 88 quadrunner.  Can get it to start but won’t idle.  Smoking pretty bad.  Pulled th jug off thinking rings and they look pretty descent (within specs).  Compression is only 110.  Valves??

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Four stroke.  Can’t find any guidance on fuel mixture adjustment.  It’s the screw to the left of idle speed, correct?  Number of turns out to start with?

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