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Sticky valve ??


paddle

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Hi guys just did a compression test on my 750m engine after discovering its true miles 72k.i got 115psi on 1 2 3 cylinders and 20 on number 4 as the bike has not run for 5 years could this be a gumned corroded valve seat ?? Should I run it to seeif if it mproves the other 3 readings are very close together 

Thanks 

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