newb here was just looking for as much info as i can get as im new to the jet ski ways bought this ski without knowing any details of it starts right up runs 6500 rpm on trailer in water trim motor does not work which i took out last night and plan to replace soon as i order it the other is compression seems we had 65 on back cylinder 70 on front no leak down but is this to low for this ski?
number on motor is JH750BE016206 and if you can tell me anything about this motor would be very helpful thank you

 

Compression is way too low... should be 135 - 165 psi. But since they read close together (a good sign), are you sure you measured it correctly?
The trim boxes are notorious for failure... water migrates up the mechanical cable/jacket, and corrodes the electrics in the trim box, which is below the water line. You can try cleaning it out. good used trim parts are hard to find, and new ones are very expensive. Most owners abandon the failed trim system, and just fix the nozzle at mid-position with a bracket.