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Old 03-14-2005, 06:58 PM   #11
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Sled: '95 ZR 580
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Part of the formula to how long before a rebuild on an engine is how the engine is set up. It seems that the dirt bikes that I have had have had have required rebuilds much more frequently than sleds I have owned. I think this is partly due to the porting and power output of the motors, but I may be wrong on this...

Another big part of the formula is how the motors are taken care of. I ride with about 3 or 4 guys who rebuild their motors once or twice a season because they ignore proper jetting and/or don't fix the real problem that caused the sled to burn down in the first place.

As for my current sled, I am rebuilding the motor in it this summer with only 3200 miles on it. A compression check revealed that the pto cylinder was at 85 psi and the mag side cylinder was at 120, and this is an EFI motor, so I wouldn't think that there should be any problem with jetting, etc. causing this motor to die.

Just my $.02
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Old 03-14-2005, 07:58 PM   #12
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Well guys I have a 99zl efi with over 11.000 on it Cat had a recall for pistons and ring on my sled and was redone at about 2000 miles and I havent touched it since I checked my compression last week and it was 105 both sides so I figured it would be a good idea to redo the top end this summer.I dont see why people are putting in new top ends with 3 to 4 thousand miles when you dont need it.One question I would have is at this mileage would you guys think I should redo the crank bearings and seals P/S.MY buddy has a 2001 sled with a 570 fan and blew it up this week with 16000.00 miles on it So if you guys are wondering if a 570 is a good motor I would have to say YES
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Old 03-14-2005, 08:18 PM   #13
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A few factors come into play when deciding when to rebuild a top end.

How do you use the motor??? Extremely hard or easy cruising???

Does it get quality lubricants and good gas all the time???

Warmed up properly before use???

Lugged and over revved alot???

Two people with the same sled will get different results based on how they treat it.

As always, your mileage may vary, dealer may sell for less, void where prohibited.
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Old 03-14-2005, 09:05 PM   #14
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One area I have had a problem with when sleds have over 4000 miles on them is that the small pin that keeps the ring from moving fails. This results in the ring rotating and catching a port. You all know what happens then. Replacing the rings and pistons is cheap insurance compared to replacing the jugs.
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Old 03-15-2005, 02:05 PM   #15
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One of the guys here at work has a 95 Doo Grand Touring 580 motor with 12,500 KMS on it

He says the motor has never been touched and he attributes this to 4 things.

1. Good maintenace before storing it away every spring
2. Rebuilding the carbs every fall
3. half a cup of oil in the gas tank every fill up.
4. WOT is only for some of the time not all of the time

Kind of makes sense i guess.

but i wouldnt want to try going that long before a rebuild
plus item #4 would be kind of hard to live with :P

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Old 03-15-2005, 09:11 PM   #16
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I have a 93 700 efi twin with 9800 miles , motor never been touched, still pulls over 100mph, these were the original big bore twins, anyone else get this high on a 650 or 700?
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Old 03-16-2005, 10:58 AM   #17
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I always love this's as good as "what's the best oil". Bottom line is ANYTHING that is looked after properly should last a long time. I see many sleds well into the 10,000 mile mark that have great compression, and never been rebuilt. These guys look after their machines meticulously. I agree that proper lubrication, proper storage, proper warmup and so on all have a huge impact on engine life.
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Old 03-16-2005, 12:14 PM   #18
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I guess if you keep an eye on compression figures and change at the appropriate time it's all good. I like to change more often then that though. I don't like waiting that long.
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