I had that exact problem Friday night on my 97 ZR580 EFI. I thought I had some
frozen water in my gas, and dumped some isopropyl into it, but it did not work.
I too changed out the plugs and within seconds I was doing no more than 20mph
and the sled would die. Plugs looked really fouled within that short time.
Dealer found that the lower coolant hose had rubbed against the frame and leaked
all of my coolant out. He said that the computer probably new something was
wrong and forced it into rich mode. The reason my hi-temp light didn't come on
was do to the fact that the connector to the sensor fell off and so far and
can't seem to make it stay - even with crimping. Luckily I had shut it off when
I knew that I was going to go no further only doing 20 !!!
> Rode 100 miles Saturday morning with no problems. Latter that night I rode
> about a mile and was losing power. Sled would not go faster than 40mph. When
> I let the throttle go it died. Tried new plugs and it started an died within
> 30 seconds. Took it to my local cat dealer and they spent all day on it and
> have not found the problem. They said it is getting gas and spark. Is there
> any fuses on this sled since it is a EFI? I filled it up with gas just
> before it died, maybe I got some bad gas? Any suggestions would be
> 97 ZR580 EFI
> 91 Jag 440
> 93 Storm(For Sale)