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Looking at a used (18 hour) aquatrax. Wanting to find out factory acceptable compression range. actual cyl 1 175psi, cyl 2 170psi, cyl 3 175psi, cyl 4 160psi. Just a little gun shy buying used. Recently cooked my 1999 Yamaha xl 1200 having 98-115 psi compression with only 62 hours on it.

Thanks for your input.
 

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Usually after being run for a while and the throttle WOT with all the plugs removed, you should have at least 190 from what I remember. Lower readings are frequently salt water corrosion in the valves from water intrusion.
 

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I'm pretty sure that the manual calls them for 171psi for compression. and 180psi on non turbos
 
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