Surfriding bad MSD?

[uwswimmer]

My ski was running good, 701 with head, b pipe, 38s, carbon reeds, prop stock cdi. I bought a used MSD and brought it to the beach with me. I installed it, tried to start it and it would not start but try to fire when i let off the start button. I traced down a bad connection on my S/S switch, I fixed that and tried again. This time I started it and it backfired right away. I tried one more time and it backfired so loud my ears rang, blew my exhaust couple off and got everyone's attention on the beach. After that I put the stock CDI back in and it ran fine. So this must mean the MSD is bad, but I wanted to see if that is a correct assumption.
Thanks

 

[TheBuzzard]

its bad guaranteed. I just went thru the same thing twice

 

[uwswimmer]

Thats what I thought. I read on here an MSD can enhance a problem with a stator that is going bad, and my last stator that went bad started to backfire. Is there any chance this could be happening? The stator that is in there was a clean used unit I put in at the start of this year.

 

[Harbor]

If it ran good after re-installing the stock cdi, then your stator is good. Only thing I'd double check is switching the MSD white wires, swap whites with the white red wire. If it's backwards it fires when you release the start button.. otherwise it's a bad MSD bad like thebuzzard said

THe long white wire from MSD goes to white red wire of your harness

 

[uwswimmer]

ok thanks guys. I def tried swapping those white wires, I guess next time ill fork up for a new MSD

 

[uwswimmer]

Is there anything that can be done with a bad MSD or is it trash?

 

[Harbor]

ya It's trash

 

[uwswimmer]

poop

 

[augustaf]

don't throw it away yet. At least wait til you see whether a new msd works with that stator!

 

[Wetbuffalo]

Can you send them to msd to be tested?

 

[uwswimmer]

Yeah, I’ll figure out a way to keep testing things and make sure it’s the msd

 

[aero92x]

Your MSD is 99% craap, had the same happen to me...ski would run poorly backfire so loud, you loose your hearing for a moment

 

[mikidymac]

Has anyone had a MSD that worked? LOL.
It’s just thread after thread of these going out. Are they all just junk?

 

[Harbor]

Has anyone had a MSD that worked? LOL.
It’s just thread after thread of these going out. Are they all just junk?

Not just MSD, I bought a used cdi too, a stock cdi that was junk, put my MSD back in all good again..

 

[augustaf]

Please, note that your stator has to be good (charge coil!) for the msd to work properly. I installed a used msd enhancer into a friends Blaster that had been running well. Did not work well- reinstalled oem cdi, all well again. Found out the 61x stator had been previously micky moused together with non oem charge coil. After installing a good stator, it worked with msd again! So, that was one time MSD was not (!) at fault....
BTW, ATP Epics are also very sensitive to stators which are less than perfect. Keep in mind, cdi's and enhancers get their signal from the stator.