Hello everyone, I am new to the forum and the PWC world. Last week I bought a 91 Seadoo GT, took it out to the lake and everything was good other than having trouble cold starting it. Choke lever is missing previous owner said he never used it. I flushed the engine with the water hose after the lake and revved up the engine a couple of times without a problem. Yesterday I added fuel stabilizer and flushed the engine to run the fuel through the lines. I tried pulling the choke cable to see if could start it without starter fluid, I notice the cable was not retrieving, so I tried pushing back. Anyways I used starter fluid to start it. everything was fine until I turned off the water and revved up the engine to get rid of any water left. The engine started revving up super fast the off button or the key did not turn off the engine, did not know what to do so I pushed the on button again and it turned off. Any suggestions as to why it did that? Thank you all.
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High RPM and would not turn off.
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JJinSC
Well-Known Member
1st, do not use starter fluid on a two stroke. There is not enough lubricant for the engine. 2 strokes get lubricant from gas oil mix. 2nd, you had a run away engine. That is a sign of air leak or lean condition. You need to refresh the fuel delivery system if not done recently. Can to give us any history on what has been done on this ski recently?
Thanks for the reply. The guy I bought it from said he had the carburators rebuilt last year. It's just weird how after the lake on Saturday I revved up the engine to get rid of excess water and it worked fine. On Sunday I flushed the engine with the water hose revved up the engine again and worked fine and yesterday I did the same thing except this time I tried pulling the choke cable to try start the engine and after revving the engine the last time it started to revv up like crazy. Is it possible that the choke cable moved something in the carburator?
JJinSC
Well-Known Member
I would definitely check the Choke cable and connection to make sure it is not interfering with the butterflies. But if it only did it this one time, it may not be an issue. I am not as familiar with the engine in the 91 GT, but the 787 and 951 will run away like that if you rev it too high out of the water with no load on it. Especially if the spark plugs have heated up some. It will cause a condition called Dieseling. The heat from the plugs is enough to ignite the air fuel/oil mixture on each stroke. As said before, a lean condition can also cause this as the fresh fuel/oil mixture is what helps keep a 2 stroke cylinder from getting too hot.
Seadoo timebomb
Member
Starter fluid is not good to run in 2 strokes, because of detonation, not lack of lubrication. It is an oil injected engine. Even without fuel the oil is still injected. DI engines have no fuel in the crankcase, only air. The oil is injected. Fuel is directly injected into the combustion chamber.
When a 2 stroke has a runaway it is due to pre-ignition, not dieseling. Usually a high buzzing sound and nothing with stop it unless you remove lanyard and open the throttle all the way. If you dont stop the pre-ignition, then detonation can occur. Then the motor will self destruct.
When a 2 stroke has a runaway it is due to pre-ignition, not dieseling. Usually a high buzzing sound and nothing with stop it unless you remove lanyard and open the throttle all the way. If you dont stop the pre-ignition, then detonation can occur. Then the motor will self destruct.
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