90 force 90 HP will not start

[jlock]

1990 Force 90 HP ran good until 2 weeks ago when it died on the lake. Compression check are 120, 120 & 90, It does fire at times but will not start. Has good spark so does that mean the stator and trigger are good and I should look for a fuel issue? Any suggestions will be greatly appreciated.

 

[Nordin]

90 PSI in one cylinder and 120 in the other two.
That is no good, 30PSI in different is to much.

Start to check the headgasket for any damage.

 

[roscoe]

Did it overheat?
Is water pump working?
Is fuel getting to cylinders.
Pull head and inspect.

 

[Jiggz]

With more than 10 percent difference in compression pressure between cylinders, you need to open and inspect starting with the head gaskets, cylinders, piston rings, etc.

 

[jerryjerry05]

I don't usually say this unless it's needed.
Use a shot of starting fluid.
​No start? then check the flywheel key to see if it's sheared?? that would account for the sudden stop.

​It might start with the 30# difference but it needs to be addressed soon.
​Any water on the plugs? all three burning the same?
​Pull the head and see if there is any damage.