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01-03-2004, 04:21 PM
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#1
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Junior Member
Join Date: Dec 2003
Location: Northwest Indiana
Primary Sled: F7
Posts: 8
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Hi everyone, I am hoping somebody here may be able to help me with this problem a friend of mine is having. He has a 1999 Arctic Cat ZRT 600 and one of the cylinders does not fire at all. The cylinder is getting spark, so I don't think that's a problem. As for compression, this cylinder has about 105 psi.....the other 2 have about 120-125. We changed the piston and rings in this cylinder and the compression stayed the same. The cylinder itself looks good and isn't all scarred up or anything like that. The cylinder is getting fuel....after the sled runs for a little bit you can see the fuel on the spark plug. He tried different reeds and even switched the carbs around, but this cylinder will not fire.....the pipe stays ice cold. Before last years season was over, the snowmobile was running great....
Thanks in advance for any help with this.
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01-03-2004, 05:32 PM
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#2
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Senior Member
Join Date: Oct 2002
Location: Saskatchewan, Canada
Primary Sled: Warrior
Where I sled: Saskatchewan
Posts: 791
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You've changed the plug,
...and switched the plug wires around too, right???
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01-03-2004, 06:46 PM
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#3
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Junior Member
Join Date: Dec 2003
Location: Northwest Indiana
Primary Sled: F7
Posts: 8
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Hey konkinj, yes new plugs were tried, also tried swapping out the wires, new reeds. Pretty much tried everything that has come to mind and it's always the same result....the exact same cylinder....dead.
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01-03-2004, 06:50 PM
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#4
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Senior Member
Join Date: Feb 2003
Location: Northwest Ohio
Mileage: 1500++++
Primary Sled: 2003 firecat f7
Where I sled: Newberry, Grayling, Home, anywhere there is snow
Posts: 10,043
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well by swapping the plug wires from one cylander to the other, you would see for sure if its getting spark,,,you know the good one is, but by swapping, if the good one still runs fine, then you know that the problem isnt fire,,,,,
now you go to fuel,,, try swapping the carbs,,,,, does the good one still run right??? if it does,,,,then I would say it has to do with the compression ,,,,,
__________________
03 F7
07 F6lxr
03 Z370es
78 Invader 440
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01-03-2004, 06:57 PM
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#5
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Senior Member
Join Date: Nov 2002
Location: S.E. lower mich
Where I sled: Fredric MI, Eastern UP
Posts: 277
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Mine did the same thing, it had a small piece of dirt in the pilot jet and prevented that cyclinder from running until I hit 3/8 thro or more, the plug had oil on it and the smell of gas, new pilot jet and running fine again. If that isn't it check the reeds, plugs ect.
__________________
25 years on sleds
3 years driving formula indys
3 years working at a cat performance dealer
03 Renegade 600HO box stock
98 ext triple clutched and geared to go
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01-03-2004, 07:32 PM
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#6
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Junior Member
Join Date: Dec 2003
Location: Northwest Indiana
Primary Sled: F7
Posts: 8
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Thanks again for your replies! The carb was cleaned very well and it was also exchanged for one off of a "good" cylinder, but the results were the same. Reeds were changed, plugs were changed...cylinder gets a good spark to it, but will not fire...pipe doesn't get warm at all. I think its kind of odd how the compression on this cylinder is lower than the others, even after changing to a different piston and rings. Would a crank seal cause this problem?
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01-03-2004, 08:18 PM
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#7
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Senior Member
Join Date: Nov 2002
Location: S.E. lower mich
Where I sled: Fredric MI, Eastern UP
Posts: 277
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Which cyclinder is it?????? Is it the cyclinder that has the pulse line connected to it?
A crank seal, I hope not.
__________________
25 years on sleds
3 years driving formula indys
3 years working at a cat performance dealer
03 Renegade 600HO box stock
98 ext triple clutched and geared to go
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01-03-2004, 08:27 PM
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#8
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Member
Join Date: Oct 2003
Where I sled: WESTERN NEW YORK
Posts: 78
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Quote:
Originally posted by Thunderman@Jan 3 2004, 07:32 PM
Thanks again for your replies! The carb was cleaned very well and it was also exchanged for one off of a "good" cylinder, but the results were the same. Reeds were changed, plugs were changed...cylinder gets a good spark to it, but will not fire...pipe doesn't get warm at all. I think its kind of odd how the compression on this cylinder is lower than the others, even after changing to a different piston and rings. Would a crank seal cause this problem?
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Thunderman,I've had a cylinder head leak and that was enough to prevent sufficient compression and the cylinder didn't fire. Sounds like that comp is to low.
Look for blow by around the jug.
A bad crank seal, maybe. I'm not sure if it can cause low psi.I do know it can lean out a cylinder so maybe it's totally shot.
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01-03-2004, 08:56 PM
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#9
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Junior Member
Join Date: Dec 2003
Location: Northwest Indiana
Primary Sled: F7
Posts: 8
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Quote:
Originally posted by zeng62@Jan 3 2004, 08:18 PM
Which cyclinder is it?????? Is it the cyclinder that has the pulse line connected to it?
A crank seal, I hope not.
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Sorry, I'm not too sure what you mean by pulse line, but it is the cylinder closest to the clutch.
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01-03-2004, 08:58 PM
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#10
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Junior Member
Join Date: Dec 2003
Location: Northwest Indiana
Primary Sled: F7
Posts: 8
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Quote:
Originally posted by JBK@Jan 3 2004, 08:27 PM
Thunderman,I've had a cylinder head leak and that was enough to prevent sufficient compression and the cylinder didn't fire. Sounds like that comp is to low.
Look for blow by around the jug.
A bad crank seal, maybe. I'm not sure if it can cause low psi.I do know it can lean out a cylinder so maybe it's totally shot.
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Thanks JBK, I will be sure to tell him to check real good for leaks around the cylinder....is there any easy way to do this?
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