97 GSX big mistake

[Web]

Guys big mistake..... I have rebuilt carbs, new gas lines, selector sw. But never checked compression, so today I bought a harbor freight tester and only have 90# on both cylinders. What do I have in store for me now? This was a almost freebie ski so no real lose.. Whats next?
Do I have to pull motor

 

[POPPS]

Is this a 951 0r 800?

 

[fatblockabody]

Get a different compression tester. The harbor freight testers notoriously read low (like around 90 psi)

 

[Web]

Think it's a 787 maybe. So tester sucks good to hear. I plan on testing the gauge tomorrow

 

[fatblockabody]

It should say right on the tag on the engine what it is. Or post up a picture

 

[mikidymac]

1st get a different compression gauge before doing anything to the ski.

2nd. A white 1997 GSX is a 787. A silver GSX is a 951.

 

[SIMPLEARKANSAN]

Seems like everyone's ski measures 90 on the HF gauge?

 

[fatblockabody]

Seems like everyone's ski measures 90 on the HF gauge?

They do. The gage might as well say Yes or No

 

[Web]

I'm sure it is a 787 and yes the gauge will be changed tonight and recheck it

 

[Web]

Update!!! Harbor Freight tester is crap.. I have 150#'s on both pistons. Its hard to get started but once is does it will start easy. Time to look for gas train air leaks and hit the water.

 

[fatblockabody]

Update!!! Harbor Freight tester is crap.. I have 150#'s on both pistons. Its hard to get started but once is does it will start easy. Time to look for gas train air leaks and hit the water.

Great news!

 

[THill]

I wish I had your outcome. Mine was 140# and 60# Engine rebuild time. UGH.
Congrats!!!

 

[JCT]

Harbor freight tester comes without schrader valve in the hose. This causes the low pressure readings, especially on small displacement engines. I bought a used snap on hose with a schrader valve and attached it to the harbor freight unit and now it reads fine

 

[Grnbeano]

Yeah I have the HF tester reading 120/120 on my 787. Motor has 8 hours so I know it’s not correct