97 xp not firing on back cylinder?

[rcket71c]

it has strong spark in the front cylider, but the back one has a very weak spark , does the plug wire need changed or the coil

 

[dewmeister]

On the 97 XP the spark plug wires are part of the coil and can't be changed (at least on mine). The first thing I would try is taking off the boot that goes on the spark plugs . Cut the wire back 1/4" and screw the boots back on.

 

[rcket71c]

that was the 1st thing we did and the spark was the same

 

[seadoobill]

i have a 96 XP with the same problem the rear cyl spark is intermitant. have you figured out what is causing this yet?

 

[timmyboy76]

try new plugs?

 

[seadoobill]

I purchased the ski not running, I had the engine rebuilt, rebuilt the rear electrical box including replacing the coil with a new sea doo coil, replaced the front electrical box because the mepm was bad, tryed 4 sets of plugs and removed teh plug caps and cut the plug wires a 1/4 inch, even cleaned the plug caps, still has intermitant spark on rear cyl.

 

[Chester]

Test the plug caps, they should be about 5k ohms.

Chester

 

[seadoobill]

fixed it

After cleaning carbs and replacing fuel line, i ck battery voltage and found that the battery was not charging, repalced the rectifier all good.