msd failing?

[Mat101]

So I was out ridding today and suddenly my ski wouldnt rev out I had the throttle pulled the whole way in and I was barely on plane.. I checked all the fuel lines plugs etc. etc. and could not find a fault. I am guessing that my MSD is either buggered or there is a loose connection. I will pull it apart tomorrow and have alook.

Any one had any similar problems with an msd (my msd is only 4 months old)

 

[D-Roc]

any backfires? mine did the same thing.

 

[Mat101]

Nope no backfires....

 

[D-Roc]

got an extra you can swap in to test? when my msd went bad it would start and idle but it would not increase the spark for rpms. i would try to rev it up and it would build a few hundred rpms then start to backfire as i added more fuel/air from the throttle. swapped in a new one and it was fine. your is still under warranty, but try swaping it before you send it away to make sure its not a fuel delivery problem or your stator.

 

[Mat101]

The weird thing is that it will rev fine when it is on the trailer but it inthe water it will go good for a couple of mins then turn to shiat. I have a stock cdi i can replace it with

 

[#ZERO]

Be sure that your spark plug ends are in good shape and you might want to check the resistance readings of your stator pulser & charging coils and ignition coil.

 

[wsuwrhr]

Make sure the ground is tight and not corroded.

MSD's do not function well without a good ground.

Brian

 

[Mat101]

The ground is tight and is not corroded... and plug ends are in good cond. BTW its an 05 SJ

 

[Mat101]

On further inspection of the ski it seems like the back sparkplug is not getting fuel / oil to it as the spark plug still looks whiteish while the sparkplug on the front cylinder looks black and oily..

Anyone got any suggestions

 

[sflsurfrider]

check your carbs

 

[waterfreak]

check your pulse line, crank seals and then your compression .

 

[Idok]

any backfires? mine did the same thing.

thats what mine did a cople of weeks ago when it went bad.....backfire backfire, the it would oly spark when you release the green button

 

[D-Roc]

could be a headgasket or oring if it runs good on the trailer but not in the water. water intrustion will clean a plug and or cause it to not fire.

 

[vomitspot]

mine would fire but not start , replaced it with a new one and runs perfect

 

[masterblaster]

thats what mine did a cople of weeks ago when it went bad.....backfire backfire, the it would oly spark when you release the green button

this is what happens when most cdis go bad,if its not doing this id look else where

 

[Mat101]

I dropped the ski into our local mechanic and he is going to sort it out, I will keep you posted on what the problem is.

 

[leprechaunjohn]

I dropped the ski into our local mechanic and he is going to sort it out, I will keep you posted on what the problem is.

what?! why? not tryin to sound mean.

 

[Matt_E]

I dropped the ski into our local mechanic and he is going to sort it out, I will keep you posted on what the problem is.

The problem will be your diminishing wallet.

 

[leprechaunjohn]

The problem will be your diminishing wallet.

x2

 

[parrdaddy]

I have found MSD problems to be caused by a broken trigger pickup wire several times. Ohm it out and/or pull off the flywheel and have a look at the wire where it goes into the short solid wire loom between the front and back sides of the stator plate.