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What pistons to use? 850

wiseco mcb pistons

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#1 351c

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Posted 25 March 2020 - 04:41 PM

Looking for feedback on what people have used when putting fresh slugs into an 850.

Being stuck at home and not sledding this week has me thinking doing some PM.

Wiseco has always been my go-to, I prefer a forged slug, but MCB makes a nice looking forged dual ring piston, and then BRP factory pistons are always an option, but cost almost double.

Anyone have experience?

Anyone weigh the pistons and compare?

 

 



#2 skirider

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Posted 25 March 2020 - 05:00 PM

Ahh. Would not steer from oem. Did it blow or what mileage on it?

#3 351c

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Posted 25 March 2020 - 05:10 PM

Ahh. Would not steer from oem. Did it blow or what mileage on it?

8800 miles, runs like a top, but just thinking preventative maintenance.



#4 mike0chek

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Posted 25 March 2020 - 05:19 PM

if it still runs good i would leave it, ive seen lots of 850's past 10k miles.  if you must, i would not go aftermarket for pistons



#5 IcutMetl

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Posted 25 March 2020 - 05:21 PM

If you have 8,800 miles and counting without fail on OEM pistons and are dead set on replacing them, why not stick with what got you this far to begin with? Value and price are totally different concepts.

#6 351c

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Posted 25 March 2020 - 05:35 PM

If you have 8,800 miles and counting without fail on OEM pistons and are dead set on replacing them, why not stick with what got you this far to begin with? Value and price are totally different concepts.

Yes true, but just wondering about advantages to dual ring pistons. Nothing wrong with OE, but looking to see who has actually used aftermarket.

Thanks



#7 Ski-B

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Posted 25 March 2020 - 05:46 PM

I can tell you from experience that the aftermarket pistons will not make it to 8800 miles. SPI.  Pro-X  they are  short life piston in our area. You pay for what you get.

 

In my personal rebuilds? I only use BRP pistons. BRP Crank seals. And BRP Gskts. In customers? It is there choice. Generally they go with the lower price Chinese products.


2020 Freeride 850. My ride.

2018 XRS 850 Sons sled.

2017 Freeride 860R etec. 860BB. Daughters sled.

2015 Freeride 800R etec. All Stock. Wifes sled.

2015 BCX  800R etec. Trail ported. Spare sled.

2014 BCX 800R etec. All stock. Spare sled.

 


#8 xdude

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Posted 25 March 2020 - 05:49 PM

What is the price difference?



#9 mike0chek

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Posted 25 March 2020 - 06:45 PM

265usd per piston and ring on ski doo site. that doesnt include pin,circlips , gakets

 

i noticed on ski doo parts canada that 850 piston assembly not available. wonder whats up with that?


Edited by mike0chek, 25 March 2020 - 06:52 PM.


#10 12/3

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Posted 25 March 2020 - 06:57 PM

I like the option of leaving it untouched, but if you're convinced on doing it I'd stick with OEM as they've never let me down. 



#11 LeeL

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Posted 25 March 2020 - 07:38 PM

I will never use after market pistons in any of mine own stuff . Evan on my 700r I run the skidoo pistons. To many wrecks over the years . I have destroyed a set of fresh ported cylinders with trygstads pistons and a customers cylinder with prox pistons. Wosnners will break skirt of in 1500 kms every time .



#12 skirider

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Posted 25 March 2020 - 07:58 PM

If it aint broke dont fix it. I think risk more issues then good opening up

#13 mike0chek

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Posted 25 March 2020 - 08:07 PM

get yourself a good compression tester and see if its even worth taking the top end apart?



#14 351c

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Posted 25 March 2020 - 09:48 PM

It isn't about price at all, and I guess I can't go wrong with OE.

That's likely the way I'll end up going.

I've always had good luck with Wiseco  in everything from dirt bikes, sleds and race engines.

I would never use spx or any of those cheap pistons, just wanted to see if there was anyone else that had personal experience on an 850 etec.

Thanks all for your help.

 

get yourself a good compression tester and see if its even worth taking the top end apart?

More of a maintenance move. I will check compression later this week and report back.

If I end up going as far as pulling the cylinder and measuring piston to wall, its getting new pistons regardless.



#15 mike0chek

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Posted 25 March 2020 - 10:00 PM

what year 850 do you have? 







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