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Whats the thoughts on pistons and rings needing to be changed out in these engines? What mileage and should it be done based on mileage or compression?
850 Top end
- Thread starter Bobsledder
- Start date
If you are able to do regular compression tests, and it passes, then the milage hasn't worn out the parts yet.
The real issue is will YOU do the top end yourself, or be forced to schedule your sled into a shop right in the middle of the season when you could end up without the sled for weeks while you wait on parts.
If doing it yourself, order the parts and keep them on your shelf.
When she fails the compression test, YOU can do the rebuild pretty much right on the spot.
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Would do myself. Just curious because my experience with 800HO and 800etec was crank runout was out of spec while compression was still in spec.
VALID POINT.
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Смотря какой пробег! Микротрещины на поршнях могут угробить двигател. На своём G4 поменял кольца на пробеге в 5000 км
I haven’t seen a lot of top ends go on these 850 motors. The 19 my wife is on now went to 2900 miles no problems. With no real sign it lost a bearing in the bottom end, luckily it was still under warranty. I had a buddy do a top end last year as preventative maintenance and then he lost the same bearing in the bottom end. It was the bearing that holds the connecting rod to the crank. I’m not saying this is the case for all of them but I personally have only seen bottom end failures, there are also a few in our group that have 4-6k miles with no issues original everything.
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I am at 2700 miles all mountain riding. Runs strong Just curious if like old two stroke thinking peple do top ends or just run em as long as compression is good
Considering most sleds probably have an hour meter, I would really be curious how many hours and miles a sled has before it needs a top end and/or crank bearings.
Lose a piston at high rpm you’re gonna lose the cylinder and crankcase. Did that at 2700 miles. My boy however went 7400 before he lost compression and cylinder on a 2019 850.
If you are losing lower end bearings, my guess is that the oil is set too low.
No idea how that can be adjusted?
I know the 850 doesn't have a throttle cable splitter going to the oil pump.
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No idea how that can be adjusted?
I know the 850 doesn't have a throttle cable splitter going to the oil pump.
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Doo you know what oil they were running in each case?
I lost the engine in my '17 last spring at 4000 miles.
I thought it would hear the rattle signs of piston skirt collapse...nope.
Earlier in the day, ran just as good as it ever had.
It peeled the top of the piston off above the ring on the exhaust port side...at just above IDLE going down though the trees!
I agree with you, have the parts ready to go so you can minimize the downtime, if you don't already plan on doing it during the summer (recommended).
What a TESTAMENT to how well built these engines are now.
That's what I'm running in my turbo '17
It was a rental prior to me owning it, running XPS 2T as well.
I've always run Klotz in previous sleds, aside from the cost of XPS...I'm sold on it.
I've even switched over my oil injected Husky TE300i dirt bike from Motorex to XPS 2T.
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