[KubotaKid24]

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.

 

[jrinjax]

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.

 

[glockm22]

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