1985 Maxim Xj700n compression test

I've just done a compression test. These are the results-

Cylinder 1- 164
Cylinder 2- 163
Cylinder 3- 159
Cylinder 4- 164

Bike was cold, haven't run it today. Full throttle. Tested correctly. Are these numbers in spec. Bike has 40,000.

 

My service manual says 156 min and 171 maximum. I'd say that you are in great shape.

 

Would that mean that my valves are in spec? Considerably, I haven't checked in a good min.

 

from http://www.xjbikes.com/forums/threads/the-information-overload-hour.27544/
where all your test specs can be found
650, 750 air-cooled engines:
Minimum: 128 psi
Standard: 156 psi
Maximum: 171 psi
Max. variance between lowest and highest: 14 psi


700 non-X (air-cooled) engines:
Minimum: 128 psi
Standard: 156 psi
Maximum: 171 psi
Max. variance between lowest and highest: 14 psi


700-X and 750-X (water cooled) engines:
Minimum: 154 psi
Standard: 159 psi
Maximum: 165 psi
Max range allowable between highest and lowest readings: 14 psi

 

no you need to check them, compression is not just about the valves.

compression helps to determine condition of motor, and the direction you would follow in repairs.
check your valves adjust if needed do compression again .

I would do full ignition test and charging system tests.

do all the inspections which is cost free to do

with that done you can then make the choice to continue and where to spend your money first. Make a plan to follow
you already know your going to spend money on the carbs at minimum for seals if all your parts are good.

 

I've already built carbs, synced and all. New coils and stator. Charge system is in spec. Valves are the absolutely only thing that haven't been done.

 

Thank you both for the information guess I'll be checking the valves now.

 

first and goal take it in for the score.