96 GSX runs great, Shut it off cranks -wont start, wait 5 mins and it fires right up,

[douggie]

First off thanks to everyone who has already helped me without even knowing it. I have been using this site for over 3 years now to help me with my GSX. Every problem I have had with the GSX so far I have been able to fix by searching this forum. This time however no luck, so I'll see if someone can help me out.

Minus a few small problems the GSX has ran great for 3 years now. Last summer it started something funny that I cant figure out. It will start and run fine in and out of water for as long as Im on it. As soon as I shut it off it wont start anymore. It will crank over all day long. If I let it sit for 5 mins it will fire right up and run great again. Shut it off and same problem I have ot let it sit for 5 mins. I have lost my mind trying to figure it out. I believe in the 5 Mins it wont start it is becasue I have no spark.

The coil on it is less than a year old. I have had a "Low 12 volt" light for a while. Finally tested for it and found my voltage to be all over the place. Bought a new Rectifier for it and still same problem there, voltage is still all wonky, over 18volts. I believe these two problems are related but I dont know how to fix it.

Any help would be great.

It is a 96 GSX with aftermarket Ocean Pro flame arresters on it and has the oil block off kit installed so im running premix. New Battery, Rectifier, Coil a year ago, Black box for coil at same time (CDI), Plugs replaced every time I go out.

 

[Dr Honda]

If your voltage is wacky... that can be causing your problem.

Also, go to the water and reproduce the problem. Then, immediately check for a spark. I'm betting you have a spark. I think your problem may be that the carbs a leaking after you shut off the engine. So... the engine is slightly flooded.

Try this... when it wont start... hold the throttle wide open, and crank. It may take 5 to 10 seconds... but I bet one jug will light... and the second one will follow. IF, this happens... then you need to replace the diaphragm or the needle and seat.

 

[douggie]

Thanks for your quick response

I am pretty sure it is not related to the Carbs. I have a 97 XP 787 as well. I rebuilt the carbs in both midseason last year. The XP runs like a top, starts great and runs great. I swapped the carbs from the XP to the GSX and same problem. GSX had the same symptoms and the XP still ran great. So im assuming the carbs are good or the XP wouldnt run very well.