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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 11-23-2011, 05:31 PM   #1 (permalink)
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Lightbulb wiseco or standard?

stock piston or wiseco. benefits/risks?
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Old 11-23-2011, 11:20 PM   #2 (permalink)
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I use Stock Type pistons with skirt coating when ever possible! Some times you can't!
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Old 11-24-2011, 07:53 AM   #3 (permalink)
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SPI make a good teflon coated piston and I haven.t had an issue with them in my ss440 engine in 2 years. Wiseco pistons cost more and are pron to cold seazing in some engine's. I also have used numaura pistons and been happy with them allso.
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Old 11-24-2011, 10:41 AM   #4 (permalink)
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Depends on what you're using them in. But for the most part I'd say an OEM grade Coated cast piston would be good.
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Old 11-24-2011, 11:29 AM   #5 (permalink)
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I have rebuilt countless Snowmobile engines with nothing but coated spi pistons. Love them! I will not use weisco pistons in a two stroke Snowmobile engine.
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Old 11-24-2011, 11:45 AM   #6 (permalink)
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weisco pistons are made better then they were in the past. but stock is good.
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Old 11-24-2011, 04:27 PM   #7 (permalink)
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I use wiseco's... I'm also smart enough to not hop on a sled and let it rip, which is how they got their reputation. People forget about how important a little warmup time is.
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Old 11-24-2011, 04:52 PM   #8 (permalink)
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I'm smart too...

I always let my machines warm up.
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Current rides

98 ZR600 EFI (03 zr900 skid, reverse, fox shocks, clutched)
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91 El tigre EXT 530 (01 Zr skid, clutched, MINT)
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Old 11-24-2011, 05:50 PM   #9 (permalink)
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I am a fan of SPI pistons will use them over standard or weisco any day.
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Old 11-24-2011, 07:09 PM   #10 (permalink)
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X3 on the spi pistons they are great

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Old 11-24-2011, 08:52 PM   #11 (permalink)
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Quote:
Originally Posted by polaris_5257 View Post
X3 on the spi pistons they are great

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X4 on the spi and for the price u can't go wrong
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Old 11-24-2011, 10:13 PM   #12 (permalink)
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Are all SPI piston's single ring designs?
I've used Weisco before, haven't had any problems.
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Not Bias at all!
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Old 11-24-2011, 10:53 PM   #13 (permalink)
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Are all SPI piston's single ring designs?
I've used Weisco before, haven't had any problems.
No I've put spis in my ultra, prox 2, and even my 1200 watercraft motor and all were 2 ring pistons


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Old 11-25-2011, 12:08 AM   #14 (permalink)
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All my SPI's where dual ring setups also. never have had a problem with them.
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Old 11-25-2011, 06:11 AM   #15 (permalink)
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If factory pistons had one ring, the aftermarkets will. Forged pistons expand quicker than cast, and are more finicky. If you let the machine warm up, either type is good. Although unless you're running super high compression or nitrous, forged is overkill IMO.
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Old 11-26-2011, 06:32 AM   #16 (permalink)
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The only reason I was asking about the duel rings is becuase my friend rebuild his 99 Zr600 with SPI and the piston's only had one ring on them? Odd...
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Old 11-26-2011, 09:24 AM   #17 (permalink)
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Quote:
Originally Posted by jwaldmann89 View Post
The only reason I was asking about the duel rings is becuase my friend rebuild his 99 Zr600 with SPI and the piston's only had one ring on them? Odd...
That engine is a dual ring design. Sounds like wrong application or they were a low compression design intended for blowing or Nos ...
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The only cat I'll ever own will have a track and not require a litter box

Current rides

98 ZR600 EFI (03 zr900 skid, reverse, fox shocks, clutched)
97 Polaris Indy 500 (stock)
91 El tigre EXT 530 (01 Zr skid, clutched, MINT)
94 Polaris Indy trail deluxe (very heavy!)

New rides
90 El tiger EXT 530
98 Zr 600 Carb
00 Zr 600 EFI (trophy winner in the 700 class drag races)
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Old 11-26-2011, 09:45 AM   #18 (permalink)
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That engine is a dual ring design. Sounds like wrong application or they were a low compression design intended for blowing or Nos ...
Yes I know it's a two ring engine, hence why I said "odd." the parts store we bought them from told us that's what he needed.
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Old 11-27-2011, 12:23 AM   #19 (permalink)
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Yes I know it's a two ring engine, hence why I said "odd." the parts store we bought them from told us that's what he needed.
Im going to have to say the parta store messed up on that one


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Old 11-27-2011, 02:40 AM   #20 (permalink)
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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.
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