1996 Polaris XCR 600 engine trouble - HCS Snowmobile Forums

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Old 03-07-2005, 08:43 AM   #1 (permalink)
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I was racing my friend (BnBElim) at WOT when the sled shut down. I thought I had screwed it up bad right there but there was no indication other than the sled shutting down. I was able to start the sled back up and I rode it carefully back to my house. I was about a half mile away when it started sounding different. Then it was bogging down a little as I gave it gas around 30 mph. I drove it home and I pulled the plugs and noticed the outer two plugs were normal but the middle cylindar plug was white with residue. I changed the plugs and rode it around the yard and it seemed ok but just sounded different. Do you guys think I just fried the rings on the middle cylindar or is it something else? :cn:
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Old 03-07-2005, 08:47 AM   #2 (permalink)
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could be a bad crank bearing? check the compresion on all three.
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Old 03-07-2005, 09:02 AM   #3 (permalink)
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I checked the compression with my thumb over the cylindars and it felt like the middle cylindar was weaker than the outer two. :banghead:
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Old 03-07-2005, 10:47 AM   #4 (permalink)
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what was the residue color and was it a wet or dry residue?
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Old 03-07-2005, 11:21 AM   #5 (permalink)
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Sorry dude, but it sounds like a dying engine to me...

Moving this to the Poo forum.. :div20:
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Old 03-07-2005, 12:09 PM   #6 (permalink)
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The residue was dry. I still have pretty good power in the sled it just sounds different.
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Old 03-07-2005, 02:15 PM   #7 (permalink)
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Quote:
Originally posted by 2uprup@Mar 7 2005, 07:43 AM
I was racing my friend (BnBElim) at WOT when the sled shut down.* I thought I had screwed it up bad right there but there was no indication other than the sled shutting down.* I was able to start the sled back up and I rode it carefully back to my house.* I was about a half mile away when it started sounding different.* Then it was bogging down a little as I gave it gas around 30 mph.* I drove it home and I pulled the plugs and noticed the outer two plugs were normal but the middle cylindar plug was white with residue.* I changed the plugs and rode it around the yard and it seemed ok but just sounded different.* Do you guys think I just fried the rings on the middle cylindar or is it something else?* :cn:
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You burnt down the centre piston.
Do an inspection through the spark plug hole.
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Old 03-07-2005, 02:38 PM   #8 (permalink)
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You smoked the center piston. DO NOT start the engine any more until it is fixed. You are only making the situation worse. Pull the jugs and inspect all 3 pistons. The cylinders are chrome plated. With any luck you can have the piston residue removed from the jug and save it. Most likely you will need a piston and rings. If the sled has high miles, put new rings in all 3 cylinders. This comes from experience. I burned down my mag cylinder in my 97' XCR600 several years ago.

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Old 03-07-2005, 04:42 PM   #9 (permalink)
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I would have to agree with everyone on the burned piston. That's the thing about having a tripple, you burn a piston and there's still 2 cylinders worth of torque powering it, where if you blew a piston in a twin it's a little easier to notice right away. I blew my PTO a couple weeks ago and am kicking myself now for riding it back to the truck. Was acting just like it sucked in a reed petal and was just flooding out.

Compression should always be the first thing checked!!!
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Old 03-08-2005, 12:15 PM   #10 (permalink)
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Thanks guys!!! I will take a look at the sled again this weekend hopefully. I got the sled after cutting wood for a friend and I am debating whether to fix it or not because it needs a new track as well. The sled only has 2,500 miles on it. Is it worth replacing the rings and possibly a new piston for the middle cylindar? Anyone know how much that would cost? I will have a friend help me do it so there would be no labor charge except for maybe a 30 rack. :beerchug: Good thing I still have my reliable 2-up-rup!!!
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