2002 ZR 600 EFI Lost PTO cylinder - HCS Snowmobile Forums

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Old 01-06-2020, 11:47 PM   #1 (permalink)
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Posts: 213
Current Sled(s): 85 SRV 540, 01 SXR 600 Triple, 02 ZR 600EFI
Previous Sled(s): My Uncle's
Location: Milwaukee, Wisconsin
Favorite Riding Area: Northern WI
19-20 Mileage: ~400
18-19 Mileage: ~250
17-18 Mileage: ~300
16-17 Mileage: 285
Age: 18
Riding Since: 2011
Default 2002 ZR 600 EFI Lost PTO cylinder

I was out, beginning a ride today and lost power in the PTO cylinder. Ill give you the trouble shooting I have done so far, plug color, and settings on the machine, and overall condition
1) I unplugged the magneto spark plug and the machine would not start, I then unplugged the PTO spark plug and it started
2) Plug was wet, and appeared to have some level of aluminum paste on it, or oil, or something
3) Ethanol switch is disconnected for using unleaded fuel with up to 10% ethanol.

4) carb boots appear to be cracked, but did not leak this fall when I tested them
5) I run it on 89 octane, $4+ is simply too steep for me to pay for 91. It has run fine like this for years
6) I run Mystic lubricants 2 stroke injection oil

The question is: Did I blow a cylinder or did I likely (hopefully) loose ignition? The sled has about 5k on the odo
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Old 01-06-2020, 11:57 PM   #2 (permalink)
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Current Sled(s): 2018 El Tigre 8000
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Check the compression, although the miles are low on the sled what folks forget about is the crankseals leaking and I would bet dollars to donuts that is what caused your issue, you did mention there was aluminun paste on the plug.
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Old 01-07-2020, 12:10 AM   #3 (permalink)
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Current Sled(s): 85 SRV 540, 01 SXR 600 Triple, 02 ZR 600EFI
Previous Sled(s): My Uncle's
Location: Milwaukee, Wisconsin
Favorite Riding Area: Northern WI
19-20 Mileage: ~400
18-19 Mileage: ~250
17-18 Mileage: ~300
16-17 Mileage: 285
Age: 18
Riding Since: 2011
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@vince
I was getting ready to do the "fart on finger test" but the hood cracked me across the head so i just put it away, I dont have a compression tester either so thats the other part of the issue.

As far as the aluminum paste on the plug, I didn't touch it (idk what I was thinking) but it was wet and almost sludgie. Kinda looked like carbon and aluminum mixed together, but I didn't look close enough and I can't say for sure.
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Old 01-09-2020, 10:56 AM   #4 (permalink)
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Current Sled(s): 2010 F8 Limited
Previous Sled(s): '03 ZL550 '04 700EFI Sabercat (15,000 mls +)
Location: Johnston, RI
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19-20 Mileage:
18-19 Mileage: 1
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Harbor Freight for a compression test kit $20-25
Spark tester is cheap too.


Had issue with my 700 Sabercat. Run all day long with top speed of 50, junk coil. week spark.
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Old 01-11-2020, 01:54 AM   #5 (permalink)
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Join Date: Dec 2015
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Current Sled(s): 85 SRV 540, 01 SXR 600 Triple, 02 ZR 600EFI
Previous Sled(s): My Uncle's
Location: Milwaukee, Wisconsin
Favorite Riding Area: Northern WI
19-20 Mileage: ~400
18-19 Mileage: ~250
17-18 Mileage: ~300
16-17 Mileage: 285
Age: 18
Riding Since: 2011
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Quote:
Originally Posted by raylag64 View Post
Harbor Freight for a compression test kit $20-25
Spark tester is cheap too.


Had issue with my 700 Sabercat. Run all day long with top speed of 50, junk coil. week spark.
I really hope it is a coil. I have to make a harbor freight run in the next couple days anyhow so Ill pick one up assuming I remember. Ill keep this tread posted as to what I find.

Compression is supposed to be 100-120, right?
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Old 01-11-2020, 08:06 AM   #6 (permalink)
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Closer to 120+ IMO. 100 is getting to rebuild time depending on the compression tester.
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