This is my first post. Glad to have run across you folks. Looks like a nice community with a lot of expertise.
I have a 1996 Seadoo GTX that has the following symptoms:
Ski starts normally. Intermittently will not accelerate through rave valve transition rpm approximately 3800-4000 rpm. This happens on a random basis with no consistency. If I increase the throttle the engine boggs down as if it were running on one cylinder. If I continue to "milk it" around this transition zone it will finally accelerate(sometimes it takes quite a while). Even when it does accelerate it's not what it used to be and gps top speed has dropped from 53-54 to 49-50. WOT is 6440rpm. Ocassionally at cruise speed the engine will bog back to the problem rpm(without releasing the throttle) and stay there until I "milk" the throttle again. Sometimes it will run quite a while without the bogging problem. Also every once in a while(last year) when running at WOT I would get a temporary burst from the 49 mph current operating max to the 53 mph max which it used to hit and there would be a temporary improvement in acceleration. I didn't notice the corresponding rpm increase so I can't provide and accurate number. Haven't seen the increase this year but I've only ridden twice.
I've changed the NGK plugs numerous times, cleaned the fuel filter, changed gas, tried running in the reserve position, rebuilt the carbs and cleaned the rave valves twice(they had a good bit of build up which I removed). I haven't completely removed the water pressure regulator, but I popped off the top and it moves freely in and out. Red caps on all valves are flush. I have not trimmed the spark plug wires back 1/4 inch yet.
Engine has 130hrs and has not been rebuilt. Have used Amsoil synthetic for the last several years. Impeller is clean and intake is clear. Cooling stream is minimal at idle, but increases substantially at cruise speed. Fresh water use only.
Gut feeling would say it's a sticking rave valve not opening as it should above the transition rpm, however that wouldn't account for the engine bogging back to the transition rpm area from cruise without any reduction in throttle. The latter might suggest internal carb fuel filter clogging, although as I mentioned I have rebuild the carbs 2 years ago and the problem remained. Any suggestions would be greatly appreciated.
One other question. When I removed the black cover under the instrument cluster on the pop up front storage compartment I noticed one of the molded screw in attach point had broken off. I'm not sure whether this hood is fiberglass or some sort of molded plastic. Any idea on the best type of adhesive to use for an attempted reattachment?
Thanks for any suggestions!
I have a 1996 Seadoo GTX that has the following symptoms:
Ski starts normally. Intermittently will not accelerate through rave valve transition rpm approximately 3800-4000 rpm. This happens on a random basis with no consistency. If I increase the throttle the engine boggs down as if it were running on one cylinder. If I continue to "milk it" around this transition zone it will finally accelerate(sometimes it takes quite a while). Even when it does accelerate it's not what it used to be and gps top speed has dropped from 53-54 to 49-50. WOT is 6440rpm. Ocassionally at cruise speed the engine will bog back to the problem rpm(without releasing the throttle) and stay there until I "milk" the throttle again. Sometimes it will run quite a while without the bogging problem. Also every once in a while(last year) when running at WOT I would get a temporary burst from the 49 mph current operating max to the 53 mph max which it used to hit and there would be a temporary improvement in acceleration. I didn't notice the corresponding rpm increase so I can't provide and accurate number. Haven't seen the increase this year but I've only ridden twice.
I've changed the NGK plugs numerous times, cleaned the fuel filter, changed gas, tried running in the reserve position, rebuilt the carbs and cleaned the rave valves twice(they had a good bit of build up which I removed). I haven't completely removed the water pressure regulator, but I popped off the top and it moves freely in and out. Red caps on all valves are flush. I have not trimmed the spark plug wires back 1/4 inch yet.
Engine has 130hrs and has not been rebuilt. Have used Amsoil synthetic for the last several years. Impeller is clean and intake is clear. Cooling stream is minimal at idle, but increases substantially at cruise speed. Fresh water use only.
Gut feeling would say it's a sticking rave valve not opening as it should above the transition rpm, however that wouldn't account for the engine bogging back to the transition rpm area from cruise without any reduction in throttle. The latter might suggest internal carb fuel filter clogging, although as I mentioned I have rebuild the carbs 2 years ago and the problem remained. Any suggestions would be greatly appreciated.
One other question. When I removed the black cover under the instrument cluster on the pop up front storage compartment I noticed one of the molded screw in attach point had broken off. I'm not sure whether this hood is fiberglass or some sort of molded plastic. Any idea on the best type of adhesive to use for an attempted reattachment?
Thanks for any suggestions!
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