1985 XP150 what is the minimum compression? I gotta be close

[Capt Fun]

Compression is between 80/91 lbs all 6 and seems to have 4 cylinders with no spark, if any help top 2 left bank will fire. Thank you in advance Mark

 

[racerone]

Test with another gauge.------No spark condition.--------I would first get the battery load tested even if it is new !----Then pull the starter apart to inspect brushes.----Ohm check from commutator to the shaft.----Note----No money spent on parts so far, just simple testing.

 

[Capt Fun]

Thank you!