Bi polar Jetski

Zeon

Zeon

WNY Crew
Location
Buffalo, NY/ Crystal beach, Ontario
ok so this jetski has some tempermental issues...

the thing has good compression, and when its cold it starts right up. it runs amazing for about 10 min in the water then you dump it and it wont start again or its a hard start then runs either uber rich sounding or crazy lean sounding. the power feels like its gone. we bilge any to all water in the hull and it starts up...

now as soon as you go to get on as its pullin you it seems like the power dies and it wants to stall. we bring it back to shore and start it. same thing.. then after about 20 min of tampering it runs great... then it will run like crap a couple min later.

BTW this is a kawi 440 1988. any ideas?
 
Zeon

Zeon

WNY Crew
Location
Buffalo, NY/ Crystal beach, Ontario
naw they are a simple motor.. that is what is wierd... carb seems all good.. motor is clean.. it seems like the 1st cylinder somtimes does not fire....


and not every one can go around and frop 5 or more grand on a new superjet. we would all love to but some people have to deal with what they have.
 
surfjunkie

surfjunkie

Location
deland fl
my ski had some of those same symptoms when my plug wires were deteriorating. it would run good at first then run bad, bring it to the beach to work on it and it would cool down and then run good till it got hot again. someone told me elec problems are worse when the motor is hot. just throwing ideas out.
 
L

last

so this is my ski that xeon's posting about... ive came to the conclusion that there is something wrong with the coil, cdi, or coil behind the flywheel. today i tried siliconing the spark plug boots and taping up the wires, it made no difference. Then i changed plugs again, the front one looked like it had water on it and i didn't think it was firing. I pulled the head to see if there might be a blown head gasket letting water in.. it was fine. This is how i came to the conclusion that its the pick up coils, cdi or ignition coil.

Does anyone know a good way to test any of these separately?

Cooling line is good.... lots of water moving through it.. barely gets warm after we run it.
 
GDFL

GDFL

Location
Melbourne, FL
You need to pull the plug boots off and trim the wire back 1/2 inch or so. The plug wires usually break down right at the connection with the plug. If you aren't comfortable, I'm sure a race shop could do it for cheap. Electrical problems suck. Silicon around the boots wouldn't help anything if the wire is already damaged.
 
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