Compression Test

[laze]

I got a compression tester... I was wondering whats the best way to test it..
Do i need to just take off one spark plug.. And leave the wire on the ground cap.. And leave the other one on... OR do i take both off.. And leave both wires on ground cap?

 

[kustomkarl]

Laze, the compression guage, will screw in the cylinder head in place of the spark plugs. To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length). Screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression guage, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot and there is a problem. I hope this helps you.

Karl

 

[laze]

Both seems good.. I think its reading 160 each... I thought it would be lower... I wonder why my ski shakes .. I mean its not a hard shake... But its more shakey then it should be.. and when you turn on my ski it idles fine... But when you give a quick full thottle and let go... My ski turns off.. You know what that could be? And also it hessites to go when im on the water at times.. And sometimes it goes fine.. When i hit full throttle it seems like it doesnt pick up power from starting.. it takes like a good 2 sec... before it get some power.. You know what this problem could be?

 

[kustomkarl]

I would change the plugs... and pull the throttle bodies boots back and spray some spray lub, little wd-40 is ok on the inside and outside of the linkage so it is working smoothly. Let us know how this works out. If it didn't help we'll do something else.

Karl

 

[stuarttgrant]

Hugeee Help Thanks Soo Much!!!!