Bad coil zr 800/900 fyi symptoms - HCS Snowmobile Forums

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Old 01-18-2011, 01:46 AM   #1 (permalink)
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Default Bad coil zr 800/900 fyi symptoms

I re-assembled my 01 zr 800 recently, has ported 900 jugs, billet head, reeds, slp pipe etc. I took it out riding yesterday, was holding its own against my piped 05 zr 900 my 120 lb LESS than me Son was riding. We drove about 50 miles flawlessly, pulled into a little gas station and topped them off with anticipation of riding another 50-100 miles, it had warmed up so I leaned out the dial-a-jets a few settings. Took off and within 3-4 miles of the gas station sled would no longer rpm to 7800, was hitting 7500-7600 and had a miss, WTF I was thinking as whole motor is fresh but has been blown up more than once . I looked at the plugs, looked fine NO ALUMINUM , jetted it back even though I knew it would not make it break up. Took off, sled was now hitting 7300-7500. Decided to head for the trailer before things got real ugly, as I headed back it got worse and worse, would barely pull 6000 towards the end, sounded just like a sled does right before it seizes. I kept thinking I must have gotten a tank full of crap gas and water but I only pumped in 4 gallons and the 05 got the same stuff and was still running fine??? Stopped several more times and checked/ changed the plugs looking for any signs of aluminum. I got to the trailer and shortened the plug wires and re-did the plug caps, no difference. I then pulled the coil off the 05 and put it on my sled and took a quick rip down the trail, was turning 7800 again with no hint of trouble, I have never seen a bad coil act like that and progressively get worse but I thought I would post this in case someone has same symptoms and can't figure it out, Smitty
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Old 01-18-2011, 07:03 AM   #2 (permalink)
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I had similar symptoms, but had a lot more misses. Turns out they last guy who had my sled tried to put high performance automotive plug wires in. They were a bit too big and came loose out of the coil.
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Old 01-18-2011, 05:57 PM   #3 (permalink)
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I just had a coil go bad on my 03 zr9 this past weekend only one side had spark. i had it tested at the dealer and he said it tested fine but said it might be weak. I bought a new one and was on my way
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Old 01-22-2011, 11:26 PM   #4 (permalink)
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Maybe I am having the same trouble, I have a 2003 arctic cat zl 600 efi. When riding along normaly sometimes the engine/exhaust goes to a low tone thats not normal. This happens then you are riding at a constant speed then back out of the throttle slightly around any speed. You can very notice the difference in the sound because I have a rumble pack on the sled and when it goes to that low tone its like I have stock exhaust! But when you give it the gas it goes without any hesitation. Could this be the same issue with me? It almost sounds like an electrical issue. Is there a switch by the thumb throttle that couls be possible be going bad?
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Old 01-23-2011, 10:24 PM   #5 (permalink)
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Current Sled(s): 14XFturbo, 12F800, 11Z1T
Previous Sled(s): 03ZR9 01ZR8 02 570 01ZR440 98ZR6 98ZR440 97ZR440's 96ZRT800
Location: Vassar Michigan
Favorite Riding Area: Michigan
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11-12 Mileage: 1000
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If your thumb throttle goes bad you usually get tossed over the handle bars when driving real slow standing up, don's ask me how I know this!!
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