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help with my 94 gts

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leechadrick

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I purchased a 94 gts that had been sitting up for a couple of years. of course the guy didnt bother to tell me the full story on this sale. If you pull the plugs and spray carb cleaner it will fire and run for a short time. Tried rebuilding carb still have the same problem.Found out the oil injection pump was bad and he ran premix gas but dont know if he kept oil in the oil section for the rv valve lubrication. I have fire and compression it just wont run.
 
Welcome to the seadoo forum leechadrick. I would do a compression test first.

Here is some information on a compression test;
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 then there is a problem. I hope this helps you.

Are the oil lines going to the rotary valve on each side of the engine? Is the injector tank still in the hull of the seadoo? Are you sure you have teh carbs cleaned properly ? Special attention should paid to the small internally filters. If it has the gray fuel lines it will need them replaced too as they deteriote from the inside out and clog the carbs. The Low Speed Screw should be at 1 1/2 turns out and the High speed screw should be at "0". it has a plastic cap on it that allows it to only be adjusted 1/4 turn out. This should help you out.If you still have a problem let us know. I'll be on here off and on over the weekend.

Karl
 
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Welcome to the seadoo forum leechadrick. I would do a compression test first.

Here is some information on a compression test;
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 then there is a problem. I hope this helps you.

Are the oil lines going to the rotary valve on each side of the engine? Is the injector tank still in the hull of the seadoo? Are you sure you have teh carbs cleaned properly ? Special attention should paid to the small internally filters. If it has the gray fuel lines it will need them replaced too as they deteriote from the inside out and clog the carbs. The Low Speed Screw should be at 1 1/2 turns out and the High speed screw should be at "0". it has a plastic cap on it that allows it to only be adjusted 1/4 turn out. This should help you out.If you still have a problem let us know. I'll be on here off and on over the weekend.

Karl


Maybe I should have gone into a little more detail. did compression test 125/130. the lines where still connected from the oil tank to the rotary valve lube but the oil tank was bone dry and I pulled of oil injection pump and blocked it off. the oil injection pump plastic gear was pretty eaten up. Not only rebuilt the carb but purchased a new carb as well. it just wont run on its own. seems to be blowing gas through the carb as well.
 
You might have a rotary valve problem. If the carbs spit gas out the carbs then the engine rotary valve timing is off. Do you have a manual to explain how to disassemble the valve to check it? If the lines have oil then the rotary valve shaft should be ok. But you will need to keep the tank filled with the same 2 stroke oil as you run in the engine. The ratio is 40:1.
I hope this info helps.

Karl
 
You might have a rotary valve problem. If the carbs spit gas out the carbs then the engine rotary valve timing is off. Do you have a manual to explain how to disassemble the valve to check it? If the lines have oil then the rotary valve shaft should be ok. But you will need to keep the tank filled with the same 2 stroke oil as you run in the engine. The ratio is 40:1.
I hope this info helps.

Karl

thats kind of what i am thinking. gave up and ordered a new engine. Dont know how long this engine was ran without oil to the rotary valve and have serious oil leaks coming from some where as well. going to replace the engine, rotary valve, and cover and rebuild the pump if that doesnt fix all my problems will have a project sale cheap. lol.
 
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well for anyone interested found my rotary valve in two pieces and the rotary valve cover seriously scarred. am prepping the seadoo for a totall engine replacement and now having problems removing the impeller from the hull.
 
improvise....

use a couple of 2x4'z, and 4-long bolts, in a way, when you tighten the bolts, the pressure is exhausted against the woods, thus pulling on the pump away from hull...:cheers:
 
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