96 speedster newb questions

[jsmayda]

Hello all new to the forum,

Long story short my nieghbor is selling a 96 speedster twin 717s cheap. Motors look clean. But it needs apolstry. Less than 30 hrs. The boat was not dewinterized and the batteries are dead. I have a red top optoma sitting in the garage and I was wondering if I can hook both positives together on the positive and both negatives together on the negative to use one good battery? Or do I need some sort of isolator?

Also which inlet do I use to run the motors out of the water? The two on top (one is near the oil fill cap) or the two near the bottom bilge?

The neighbor said that it smoked quite a bit at first start out of the water. So I'm assuming that its not getting water in the motor but its a oil/fuel mixing prob. Any ideas?

Hopefully I can get it on the water soon and test her out!

Thanks,

 

[boatmonkey82]

ruunnn . its a twin speedster !!! . i have seen this many times on the twin engine boats . you may want to ask one of the big boys on here but i do know that the seadoo mpems or main computer are sensitive to high amperage , via '' never boost batteries alway have your dealer service your battery '' blah blah

 

[unclejay]

Suggestions

Yes you can use a single battery, there is an article on www.seadoosource.com about how to do it. The main problem is holding the battery in the hull - Sea Doos bash around a lot on waves and if the battery is not very secure it may cause a fire. For that reason I decided to stick with 2 Sears batteries. Its nice to have a backup if one fails too. Remember you have a crossover boost switch, if one battery dies you can start using the other. Sometimes.

The water inlets are the ones on top, you need a flush kit before you can connect the garden hose, available at vendors. You also need to clamp the outlet line see your service manual (you can get one by being a premium member). Dont skip this step.

Lots of smoke on first start is common. Dont run more than 30 seconds out of the water if possible.

 

[kustomkarl]

DO NOT connect the batteries the way you described! Replace the battery with the original ones. If you jump start your battery from a running source it might cause a surge to your electrical components and cause more electrical problems. You can hook you seadoo to either the top or rear hose connection if you please. On the jet boat it isn't necessary to pinch off the hose. The extra pressure will just go out the end that isn't connected on the rear.I prefer to use the one on the top under the deck lid with the cap on it. This way you can leave the lid open and keep an eye on the connection and look for any leaks that might accrue. Here is information on running on the hose;
YES, you can hook up the hose to the seadoo and have them run for up to 5 minutes. Connect the hose and start the seadoo. Turn on the water after it is started. Turn off the water, than shut down the seadoo. This way it won't allow water to back flow into the engine through the exhaust due to no back pressure from the engine not running. The bearings and seals on the impeller jet pump are cooled from being in the water. When it is on the trailer it doesn't have that cooling effect so they will get hot after about 5 minutes.
I pre start my seadoo's too, dry before I leave for the launch too. Just for a second or 2 to be sure it will start at launch. Peace of mind is worth lot.
Run each engine separately.

Karl

 

[jsmayda]

Well now I'm really confused. I did read the article on battery conversion it looks simple but what if I add an additional battery selector switch instead? To use one set or the other? any other opinions I am very interested.

Thanks forthe replies.

 

[kustomkarl]

You can use a battery selector switch. Each battery will be isolated from each other. That's the best way.

Karl

 

[jsmayda]

We had dewiterized the boat and it smoked like crazy when it first started. Both motors started and ran smoothly. We put it in the water and after it warmed up and we put the throttle down it ran great. The smoke cleared even at lower rpms. I was very happy and will be purchasing it soon! I will be a seadoo owner!!!

Btw: We used the one marine battery using only one set of terminals and both grounds. Everything worked. Is there any potential porblems with that?

The lake was a little ruff but we topped out around 55 mph at 7000 rpm is that about the right?

Thanks for all the input.

 

[jsmayda]

Has anyone tried that or should I hook up both terminals. I wonder about the charging system whether it will charge the battery using only one set of leads. Or if it will damage the stater

thanks

jeff