• I've received emails and PM's asking me about "Group Buys" and promotions.

    A Group Buy here on SnoWestOnline.com would be a situation where a normal member (non vendor or mfg) personally collects orders from other members. That member then uses those orders to negotiate a better price with the Vendor/Mfg for HIS/HER "Group" of buyers.

    Here is an example of a viable "Group Buy"

    http://www.snowestonline.com/forum/showthread.php?t=269222

    A promotion that has the words "Group Buy" in the title is still a promotion, and from the rules that were handed down to me by Harris Publications is that non-advertisers cannot run promotions or open sales programs on the forums outside of the swapmeet.

    If a members wants to become a group buy manager, maintain a thread and collect the funds and negotiate a group buy... as a member, you are welcome to do that as long as you are not attached to the business of the vendor or Mfg.

    If you are a vendor/MFG and you want to offer an EXCLUSIVE "SnoWestOnline ONLY" promotion that is exclusive to snowest readers, please contact me and you'll be able to put it up in the Polaris forums.

    Also, before any vendors/mfgs get all "riled up" over this know that the moderators are strictly volunteers and do not receive a dime from any advertising $$ spent on this site.

    As ALWAYS, since DAY ONE of me becoming a moderator, I have pioneered, supported and encouraged vendors and mfgs in getting the word out to our readers with "New Product Announcements.

    Have a great season.

    From this point on, all vendors/mfg's promoting Pre-Season tiered sales programs, in the Polaris Forums, that are not paid advertisers will be appropriately moved to the swapmeet section of the forums.

    MH

Spi Axys pistons

Mar 9, 2017
169
32
28
stillwater MN
3100 miles on stock cylinders and pistons, cross hatch almost gone. Poor man way to get close to indy dans finish, ride it for 3000 miles and let the rings smooth out that nik. nik looks good. crank rods look okay not a lot of wobble.
 
Mar 9, 2017
169
32
28
stillwater MN
Took measurements today on spi piston vs axys piston in 3 different spots bottom middle top above rings. Remember the axys piston i am using has 3100 miles on it and could account for the .001 to .003 I am seeing. Also not sure how thick the coating is on the spi piston.

bottom of stock axys piston measured 3.3385
bottom of new spi piston measured 3.3395 .001 bigger
Middle of stock axys piston measured 3.3355
middle of new spi piston measured 3.337 .0015 bigger
Top of axys piston measured above rings 3.312
Top of new spi piston measured above rings 3.315 .003 bigger

The spi piston is .001 to .003 bigger then the used axys piston.. How much of this is the wear of 3100 miles and the coating on the new spi piston. Seems to me they have the taper dialed in to be very close if not spot on to stock up to bottom of rings.

I would not hesitate to use these pistons and the are 22g lighter.
 
Nov 10, 2017
7
2
3
Is the general consensus that the Spi hyperdrive or Tmoly pistons are a good reliable alternative to factory pistons?

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Sheetmetalfab

Well-known member
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Oct 5, 2010
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Ak
Is the general consensus that the Spi hyperdrive or Tmoly pistons are a good reliable alternative to factory pistons?

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in my opinion..........
I don’t think there is a general consensus on any piston selection.

Based on the sheer numbers of oem pistons being used out there????

all my research has pointed to the oem 2015 pro rmk pistons being the best choice.......
 
Nov 10, 2017
7
2
3
in my opinion..........
I don’t think there is a general consensus on any piston selection.

Based on the sheer numbers of oem pistons being used out there????

all my research has pointed to the oem 2015 pro rmk pistons being the best choice.......
OEM 2015 piston better than the last polaris OEM piston?

I'm just looking at different options. Iv used RKtek on my previous sled at around 550$ Cdn shipped plus bearing and gaskets. OEM is 300$ cdn per piston plus bearings/gasket.

I have nothing against wiseco's but I personally wont buy them for a replacement.

These spi's seem to have good reviews/ best bang for your buck. I haven't read any failures with them on axys yet myself

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diamonddave

Well-known member
Lifetime Membership
Apr 5, 2006
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Thieve Capital AKA Federal Way, WA.
in my opinion..........
I don’t think there is a general consensus on any piston selection.

Based on the sheer numbers of oem pistons being used out there????

all my research has pointed to the oem 2015 pro rmk pistons being the best choice.......

Boy truer words were never spoken. I think the OEM piston isn't too bad since '13 with the newer thicker skirts and better QC of clearances. Having said that, I have had great luck with Weisco's in the Fix Kit from MTNTK going back to the Dragons.

Last winter I had an engine brought to me with less than 150 miles and SPI's. It looked like the 2012 Scud missile, holes and pieces galore.
 

Sheetmetalfab

Well-known member
Lifetime Membership
Oct 5, 2010
4,939
2,468
113
Ak
OEM 2015 piston better than the last polaris OEM piston?

I'm just looking at different options. Iv used RKtek on my previous sled at around 550$ Cdn shipped plus bearing and gaskets. OEM is 300$ cdn per piston plus bearings/gasket.

I have nothing against wiseco's but I personally wont buy them for a replacement.

These spi's seem to have good reviews/ best bang for your buck. I haven't read any failures with them on axys yet myself

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yes the 2015 pro pistons have a better lock on the ring locator pin than the 16-18 Axys pistons. (Can tolerate more detonation abuse. )

(i’m not positive but I don’t think they have changed since 18+)

same dimensions.

I’ve seen more failures in the dragon, pro era sleds using Spi, wiseco, rk tek, pro-x pistons than with OEM.........
(And there’s a lot more sleds running oem......)
 
Mar 9, 2017
169
32
28
stillwater MN
I was just hoping to hear some real world experience on these updated spi axys pistons.

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I will follow this up as the season goes on. I am leaving the pro out of this. Different engine, different era.

I had indy dan run bore gauge down both cylinders and everything checked within spec. Wish i had a new set of axys pistons to check alongside the spi but i did not. Honestly if we did not bring a backup sled on every trip I would not be trying these. This is obviously a new design with oil groves on both sides and 22 grams lighter then stock until you add the wrist back in which is heaver. ( i used axys lighter wrist pins) The big test is yet to come, we will see how much they grow with heat and if the skirts hold up. The one thing that concerns me is the weight being that much different stock spi to stock poo. Where did the 22 grams go? I could not visual see it.
 
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