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Old 02-25-2005, 09:54 AM   #1
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Just wondering how many miles some of you have put on your two stroke before it needed a rebuild. 10,000, 12,000? What would you consider to be the minimum compression before the engine needs to be freshened up?
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Old 02-25-2005, 10:10 AM   #2
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I got about 6000 miles on my ZRT before it had any problems. My stepdad had a 93 Jag 440 before with over 7500 miles and it was still on the original piston and rings. If I get a chance to check the compression on the two cylinders that are good I'll post back what the psi is.
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Old 02-25-2005, 10:10 AM   #3
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Sled: 2012 Polaris Switchback 800 Pro-R
10-11 Mileage: 1400+
09-10 Mileage: 1613
08-09 Mileage: 1226
07-08 Mileage: 846
06-07 Mileage: 1139
ATV: No ATV (yet)
czy...

Nice timing ... I actually posted this about a week ago

I'm going to have my top end refreshed this spring, and that's going to be at a mileage of just over 4000 miles. A buddy of mine is a mechanic at a Cat dealership, and he said it's definitely time by 4,000 miles. It doesn't matter if your compression is still around 140psi according to him. Any bit of wobble will take out a cylinder.

His theory, which I agree with, is it's better to refresh it than for it to blow up and replace a lot more.
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Old 02-25-2005, 10:12 AM   #4
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I had a piston fail at just over 4400 miles. I am looking at a pretty major rebuild.
If it has never been done I would say at 4100 miles the top end should be looked into at least.





Quote:

"His theory, which I agree with, is it's better to refresh it than for it to blow up and replace a lot more. "

Absolutely
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Old 02-25-2005, 10:18 AM   #5
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That's the reason I am asking. My 99 ZL is running great at 4100 miles. I have replace darn near everything on it but the stator, recoil and engine. :P Kids mainly ride it now so It doesn't get much use lately with lack of snow. I was thinking if Cat doesn't wow me this year I may just put a new track under it, put some hooked bars and have the engine freshened up. Compression is 120 each cylinder and i have always burned syn oil in it. ( did add some energy release to the engine and chaincase)..
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Old 02-25-2005, 10:57 AM   #6
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Sled: 01 VanAmburg 1010/01 Zr 1010
ATV: 92 TRX300FW 96 AC 454
Wany to hear something wild?
The Natives here are getting about 25,000 miles on an engine before a rebuild! They mix oil and run the injection. Yep they're rich with oil but they clean up the plugs and are good to go.
Ichange my pistons out on the 1010's at about the 1500 mile mark though. The skirts shrink and I don't want them rocking in the bores too much. For stock cyls. we change the pistons out at 4,000 or so and an overhaul at 8,000.
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Old 03-14-2005, 01:03 PM   #7
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Sled: 2012 Polaris Switchback 800 Pro-R
10-11 Mileage: 1400+
09-10 Mileage: 1613
08-09 Mileage: 1226
07-08 Mileage: 846
06-07 Mileage: 1139
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I was talking with a buddy of mine over lunch today, and the rebuild topic came up. He's a die-hard Doo guy, and had mentioned Bombardier put a post on the Corporate Corner forum within Dootalk mentioning the industry standard for a rebuild. According to them, the "industry standard" is 300 hours.

Here's the link: Engine Life Link on Dootalk.com

Interesting to actually see a company put out a number like that. Hours vs. miles on a sled are going to differ greatly for sledders due to riding styles. I've got over 4000 miles on my sled, but only 153 hours on my machine. According to this "standard" I've got another 4000 miles to go!! I won't be waiting that long, and will still plan on replacing the pistons and rings this summer.

Just thought I'd share this as I've been hearing the discussion on the web as well as within our sledding group.
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Old 03-14-2005, 01:52 PM   #8
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I wonder how Ski-Doo came up with the 300hr Industry Standard???

I would end up with well over 10,000 miles in that time. I would be more apt to think a refreshened top end before the start of a new season, would be cheap insurance over a walk out of the woods.
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Old 03-14-2005, 04:55 PM   #9
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300 hrs. does seem like a lot of time/miles. Maybe this is a computer calculated figure, based on average wear and tear? I think we've all heard of at least one
Ski-Doo owner who's at least replaced the rings with fewer miles than that though
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Old 03-14-2005, 05:59 PM   #10
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I've never opened up any of my sleds motors for repair, never had one go down, and they've all had at least 5500 miles before I got rid of them. I'm sure they've lost a little power by thst time, but no problems whatsoever.
I'll also add, I just picked up a '77 Jag for my nephew to cut his teeth on- it's got over 8300 on the odo, never been touched. Bought it from a lifelong buddy, who got it with around 7000miles-22 years ago!
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