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post #1 of (permalink) Old 12-26-2000, 12:37 AM
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burn down again

i have a 94 zr 580 two years ago it burned down the right piston, melted the top of the piston near the exhaust port. so i replace the piston and rode it for the whole year. this year i got it out of the garage and put eighy miles on it and burned down the left hand piston at the exhaust port, so i replaced this pison, then i put one hundred miles on right after replacing the left side and the right side melted a hole in the center of the piston. i checked the CDI box to make sure that the timing advance is working. that was ok, this last time i had mixed the fuel to fifity to one in the tank to make sure the oil injection was working. what is going wrong with this thing. has anyone had this same problem with this sled or another one

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post #2 of (permalink) Old 12-27-2000, 02:59 AM
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Re: burn down again

Jetting?? The 580's can be really sensitive to proper jetting. I have a neighbor that still carries the name "Burndown" because of his '94.

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post #3 of (permalink) Old 12-27-2000, 11:57 PM
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Re: burn down again

yeah thats what it is looking like the jetting. i am going to go up on the mains two sizes and and start there.

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post #4 of (permalink) Old 12-31-2000, 12:59 AM
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Re: burn down again

have you cleaned the gunk out of the carbs and the water out the fuel lately?

post #5 of (permalink) Old 01-02-2001, 08:37 PM
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Re: burn down again

chect to see if your jets have varnish built up in them when they do it acts like a smaller jet and you can burn your motor up

post #6 of (permalink) Old 01-04-2001, 08:39 AM
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Re: burn down again

Sounds to me like you got some bad gas. I would check your carbs and drain your tank. Did you get your gas at the same place? If so I would find a different place to buy gas.

post #7 of (permalink) Old 01-09-2001, 03:36 AM
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Re: burn down again

I'd say jetting all the way, or varnish on a jet, like previosly mentioned. When ya take her out again, check your plugs....alot, don't want it to happen again. Plugs shouldn't be grey or white!!!!

post #8 of (permalink) Old 01-10-2001, 12:32 PM
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Re: burn down again

Errosion of the edge of the piston or a hole drilled through are indicators of lean condition. Fatten it up after cleaning the carbs... plugs are cheaper and easier to replace than pistons. Also they need more fuel if it gets colder.

post #9 of (permalink) Old 01-17-2001, 12:08 PM
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Re: burn down again

The same thing happened to me and my 400, so much so that they called me piston poppin Mag. Hubby worked at the polaris place at the time so we had lots to work with. We started with the exciter coil...no go. Then tried everything else that could be done...no go. Then put in a completly different moter we had sitting on the bench just for such an occasion. Popped another piston. Each time would get about 1000 miles on before meltdown. I was depressed. This is my custom built sled.Finely hubby said that the only thing left, that couldnt be really checked was the cdi box.I mean everything had been replaced. By this time I had a new jug, gone back to stock pistons, even a new crank. We put the new cdi box on at 14000miles. Inow have 18600miles on. I would try a NEW cdi box. (We tried a used one once and it was bad too.) Needless to say, hubby tried to smash the two bad ones so no one else could get ahold of them. He couldnt even dent them. Tough little buggers.

post #10 of (permalink) Old 01-17-2001, 05:12 PM
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Re: burn down again

When you take the plugs out they should be a chocolate brown color. White and gray is to lean. If you are to lean just fatten up your jets a little until you got it. Engine meltdowns are never fun, good luck!

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