96 GTI 2 Stroke/Compression Top End/Rings

[jnylund]

Hi, I have a 96 GTI, runs great when I get it up to speed, but it seems to bog or go slowly getting up to plane and out of the water. My neighbor says I likely need a Top End/Ring job and that I need to check my compression. So questions for the experts:

1.) Is this good advice?

2.) How do I check the compression (can I get something at the local auto parts shop? or so I need something special for a seadoo). Ive read stuff that says ground the plug wires, how exactly do I do this?

3.) What should the compression be for this model, or where to I check in my manual.

4.) What should I expect to pay if I take this to a mechanic to get done? (im in nortnern va)


thanks in advance
Joel

 

[LouDoo]

I doubt that its the compression, but it's easy enough to check.

Ground the spark plug boots, there's a grounding post just in front of the engine mounted on the magnito cover. Its two metal posts, with a orange plastic partial cover.

Remove the spark plugs, insert the compression guage in one of the spark plug holes, a threaded guage is best. Turn the engine over, the compression should be 150psi on each cylinder, no less than 130psi, and no more than 10% difference.

You can buy a compression guage at an auto parts store, or Sears.

Do you still have the grey fuel lines on your ski.

Lou

 

[jnylund]

I do have grey fuel lines, I am not the orig owner, how do I know if they are the original ones vs newer that happen to be grey?

thanks
Joel

 

[LouDoo]

Grey Fuel Lines

If you have grey Tempo fuel lines new or old you really need to replace them. You'll need about 20' of 1/4" black automotive fuel lines, 25' if you do the vent lines, and about 20 stainless steel clamps.

You will need to also clean or replace the main fuel filter, 2 carb. filters (1 in each carb) and the fuel selector valve. I would replace the selector valve.

Lou

 

[jnylund]

Thanks Lou,

Where are the carb filters, how do I replace them.

I cleaned out the main fuel filter it was pretty nasty.

I also replaced the fuel sending unit this winter (trying to fix gas gauge), my gas gauge worked for about 15 minutes and now it is stuck always saying out of fuel (may be part of my problem or symptom)

Where is the fuel selector vavle?

thanks
Joel

 

[voodoo]

Fuel selector is the reserve/off/on control, the grey lines are feeding your filters restrictive goo, this will slow your down and eventually cuae the burnout, this is why compression is always the first test on a 2stroke to see if there is life left to use when the fuel/oil system is restored to good working condition, stop riding now and save the engine - the filters inside the carbs are small version of what you have under the handlebars but you need to take the carbs off the engine to get access, keep the carbs in an old cookie sheet so the small screws do not fall between the slats of a picnic table or lost in the hull, if you open carefully you may not need any more parts than the cleaning of the screens.

 

[jnylund]

Just to confirm I have the right part is the fuel selector #6 in this diagram:

http://partsfinder.onlinemicrofiche.com/seadooforums/Seadoo_oem/Seadoo_PWC.asp?Type=13&A=38&B=18

thanks
Joel

 

[dsw222]

stop riding now and save the engine \.

good advice. i didn't listen and kept driving my boat while i was waiting for my carb rebuild kits to come in the mail. now my one cylinder has 75 psi compression and i'm not happy

 

[LouDoo]

Thats the correct part, however I bought a selector for a later model. It has a much thicker knob, the older style knobs always break, the only thing different is you will need to rotate the valve 90 degrees.

Lou