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Massimo Msu 500 EFJ


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I am wokring on a MSU 500 that ran out of fuel and now , will not start. Pump runs and the injector shoots out a good pressure. There is good spark. Valve clearance is correct.How much pressure does the  pressure release system release ? I am showing only 8 to 10 lbs  ( unless my guage is bad).  The unit was possibly submerged ; lots of mud on everything.  Any suggestions ???

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