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Speedster engine starts out of water but not in water!

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waternuke

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I have a 97 speedster with twin engines. Driving it the other day no problems except for a little loss of power I've noticed lately. Then after about 30 minutes of pulling a tube, we stopped and the right engine would not start, cranked it as much as i dare. Towed it back changed the plugs, still would not start. Put it up on the lift and the engine started, put it back in the water and it would not start in the water. Any ideas?
 
I have a 97 speedster with twin engines. Driving it the other day no problems except for a little loss of power I've noticed lately. Then after about 30 minutes of pulling a tube, we stopped and the right engine would not start, cranked it as much as i dare. Towed it back changed the plugs, still would not start. Put it up on the lift and the engine started, put it back in the water and it would not start in the water. Any ideas?
We were having a similar issue in our 96' speedster were the boat was very hard to start in the water, but would start just fine on the trailer. I did a compression test and got 140psi on all cylinders. Never did figure out the problem.
 
I had close to the same problem with my 95 speedster. One of my motors would completely cut out on me in the water, but on the trailer it was fine. I spent have the season rebuilding the carbs with no luck. I then decided to pull the motor and found that their was a lot of resistance on the shaft going to the impeller. What I found is that the thrust bearing in my impeller was bad because of lack of oil. I rebuilt the impeller assembly and the motor has run fine every since.
 
It could be either a jet pump issue or a bad wire condition. Check the wires on the battery, and the ground wire- going to the ground by the starter. It needs a good clean connection. If it looks ok it still might be corroded inside the connector and need replacement. The engine needs the amps from the battery to crank it over. It could have a full 12 volts but have a bad connection and not get all the power to turn it over. Be sure the battery is ood too. If in doubt have it LOAD tested at like Auto Zone for free. Check the Jet pump too because the engine will have more of a load on it in the water and cause it to not be able to turn over if the jet pump bearings won't allow it to. Either condition could be the source of your problem.
You might want to do a compression test too so you know what's going on inside...it should be ideally be 150 PSI per cylinder. Low compression would cause it to be hard starting and no power...The load from being in the water would make it worse.

Karl
 
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