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View Poll Results: Wiseco or Stock pistons
Wiseco 9 37.50%
Stock 15 62.50%
Voters: 24. You may not vote on this poll

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Old 11-27-2011, 03:53 AM   #21 (permalink)
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While SPI & Standard or coated pistons are fine...you'll be hard pressed to beat a set of Wiesco if you properly warm up your motor till the heat exchangers are warm like your supposed to.

***Another reason why I choose Wiesco is I been using them for over 30 years and am comfortable with a "known" product but in all fairness materials & coatings have come a long ways over the years so I'm sure the newer stuff has come a long way and are most likely comparable.
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Old 11-27-2011, 10:42 AM   #22 (permalink)
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yeah Wiesco has come a long way in the last few years also.
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Old 11-28-2011, 12:03 AM   #23 (permalink)
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every motor i open up gets wisecos. like said before as long as you let em get to operating temp youll have no issues which you should do either way.
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Old 11-28-2011, 12:38 AM   #24 (permalink)
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Oh I like weisco's. I put them in my Camaro, quad and lawn mower. But in a Snowmobile, they're too temperamental. I always let my stuff warm up, but there's too many variables in snowmobiling.
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Old 11-28-2011, 02:01 AM   #25 (permalink)
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ive never had any issues to date with em.
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Old 11-28-2011, 09:30 AM   #26 (permalink)
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Used Weisco on a couple of my bikes and was happy with the gains but in a 2 stroke snowmobile the stock pistons or SPI work great and are not as particular as the Weisco.
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Old 11-08-2012, 03:13 PM   #27 (permalink)
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Where would you buy your pistons

Hello im still fretting on this one, two years ago I purchased 3 SPI moly coated piston kit off of e-bay, the rebuild occurred on a 1998 Polaris Ultra at 3000 miles and its been 400 miles since and the rings havent even seated yet, the compression still sits at 110 psi across the board, the cylinders were not glazed on inspection, Im wondering if thats what is happening, atleast I wasn't concerned about the quality of the SPI piston being purchased from e-bay at the time, could they have been misfits? The likely hood of being the only one having this issue is likely low I dont want to incriminate but I might have to call up the shop that sold me the pistons, as the mechanic who rebuilt states SPI is as reputeable as he is LOL, hes my Uncle so I could never fault his expert way. Where would you buy your engine parts?
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Old 11-08-2012, 04:16 PM   #28 (permalink)
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@racing kidd - Are you doing your compression test with all the plugs out, throttle held wide open and pulling it over at least 5 to 6 times or cranking it until the needle stops moving? Have you tried using a different compression tester? Just a couple of thoughts before assuming the worst.
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Old 11-14-2012, 12:07 AM   #29 (permalink)
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Quote:
Originally Posted by 69CRUZR View Post
depends on the engine type. If the engine is a cast iron sleeved cylinder I would not run the Wisecos. If it is a nicasil (spelling?) coated aluminum bore then I would not worry about it. Aluminum heats up and expands MUCH faster than iron, and the cold seize syndrome is way more common in those engines, where a guy starts it lets it idle long enough it wont die when he slams the gas, and goes screaming wide open across a field. The pistons expand faster than the bore and it seizes up!

With the nicasil coated bore the metals used in both the bore and piston are certain alloys of aluminum, and will have a much more similar expansion rate, I chose Wiseco for my Liberty 600 after lots of debate about this exact same topic.
i totally agree !!!
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