4 replies to this topic

[SeaDoo Challenger 99]

Hello, I have 99 challenger 1800 twin 787's. I have been having spark issues with my right side motor for last 4-6 weeks. Just a little update on what I have done thus far.

I have cleaned and rebuilt all four carbs with mikuni parts.

Cleaned acc pump on carbs and new diaphragms in both

Took out all four rave valves and cleaned them and reinstalled with new gaskets.

New wear rings

grease drive shaft


now for the spark issues. The left side motor cranks up fine and runs great. The right side motor is SOOOO hard to crank (or get spark) but once I do it cranks every time after that for the rest of the day on the lake. It acts like after gets warm and broken its ready for day on the lake. Its just that first start that sometimes never happens. What I have done to fix this. I have removed the ignition box from right motor and put on the left motor and it cranks. I put the coil box from the left motor on the right motor and it still did not crank. I took the plug off the front on magneto and checked for corrosion and sprayed electrical cleaner and put it back in. I did a continuity test for the 4 wires from the coil box up to the mpem and i have continuity. Only thing I couldn’t trace the red wire from the coil box ( I believe they head to the rectifier but not for certain). I have change spark plugs and put new ones in and still no luck... I have check the ground on the mpem and it checks good. I am checked the ground for the coil bock and it seems good too. I placed two jumpers from the mpem ground directly to battery and the coil box with still no luck...

Now, what should I do from here?!?!? I have done the advance diagnose and the right motor will give me two short beeps. But the left motor will crank right up. I checked this code and its talk about DESS system not working right... How can this be so if the left motor cranks fine on the same lanyard?!?! And when I am not dig mode and put the lanyard on the post i get two beeps as normal and left motor will crank right up but the right motor will just turn over...

Any help on what to check or go from here would be much appreciated....

Thanks
Jimmy

[Rave1]

Grounds down by starter have been cleaned on right engine,so there is no spark at all?Where is Adventuer when you need him.Keep the faith Jimmy,I`ll do some thinking on this one and post back.

[SeaDoo Challenger 99]

Grounds down by starter have been cleaned on right engine,so there is no spark at all?Where is Adventuer when you need him.Keep the faith Jimmy,I`ll do some thinking on this one and post back.

Yah, I am about to beat my head in on working and thinking what to do to this thing...


Please, someone has to have some insight on what to do...

Thanks
Jimmy

[Fusion Worxs]

Yah, I am about to beat my head in on working and thinking what to do to this thing...


Please, someone has to have some insight on what to do...

Thanks
Jimmy

Hi

First thing, get a shop manual, check the specs for the Stator , if it is in spec, still does not mean it is good, but if it is in spec, change the voltage regulator.

let me know if it works.

[adventurer]

Hi Jimmy!

electrical problems can be difficult to diagnose some times, so already changed the coils and still the problem remains, as our friend said move to the
stator and regulator. change the regulators from one engine to the other to make sure its working OK. the red wire on the regulator leads to a15 amp fuse, check the terminals are clean and not corroded. the stator pick up coil can be defective but to replace it the stator has to be replaced as a unit.just to be sure the problem is electrical and not mechanical do a compression test on each of the cylinders,it should be around 150 psi on each.inspect inside the plug that connects to the coil box top, make sure its clean with no corrosion. is the engine starting fast enough??? if not it can also lead to weak spark, in this case the starter should be inspected, is the battery OK?? tried another battery to be sure???

good luck and keep us posted

Abdin