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fastjeff

fastjeff

Gold Medal Contributor
Running my ADI Merc triple. Starts fine and runs normally for at least a half hour. Slow her down to idle speed and she dies, then won't restart. She tries to start, firing now and then. but just can't get going. Had to get towed in (blast it!)

The next day she fires right up and runs fine again (in a barrel). My DVA meter says all is well: stator, coils, trigger coil, etc, so what's happening here?

I'm thinking it's a heat related failure of the switch box, but the tech at CDI disagrees: He said switch boxes work or not, period--like a light bulb. I'm thinking that this is not correct, that some electronic component in there is crappy out when hot.

Opinions, please.

Jeff
 
Jeff, I would take a hair dryer to the stator and heat it up good then check for continuity between the stator leads (or loss of in this case).

I would suspect the stator (specifically a broken winding that is causing a continuity loss when it heats up/expands) before the switchbox and tend to agree that they (switchboxes) tend to work or not work in my experience.

And while you are at it, check the resistance at the trigger as well. Might have lots of power with nothing telling it to "let go" :)
 
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New switch box on order--I can always use it as a spare. Hoping it's not the stator--the thing's only a couple of years old (CDI).

Love the hair drier idea! I'll try it thing morning.

Why Sierra stators? Had a bad experience with CDI?


Jeff
 
Take a timing light out with you and check if it loses spark when the problem happens. Is it overheating? Are the plugs wet with fuel (possible flooding)?
 
CDI's quality has went downhill since Ray sold business several years ago and they outsourced their manufacturing. Thats why BRP dropped them I was told. I have gotten new parts in box that was bad before they were installed, I use Sierra as has lifetime warranty and they pay me if it needs replaced. an I have been a Rapair/CDI dealer since 1981 and they used to buy my cores!!
 
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Update: Stole the wife's hair dryer (since I couldn't find my heat gun) and zapped away at the switch box. No change in idle rpm. So...

It makes sense that the problem is the stator. The motor ran fine above 3,300 rpm (on the red wire, high speed coil circuit). It was when I slowed down (and the blue wire, low speed circuit of the stator took over) that it started skipping and finally died, not to restart.

So... More money. And it won't be another CDI product, by the way.

Jeff
 
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