Teflon coated or OEM

[mp_2009]

i was just wondering what the advantages of teflon coated pistons if there are any just burned down my sled 900 king cat and want to know if i should just throw some OEM pistons in or would teflon be a good was to go?

 

[Idcatman1]

Pistons

Don't know about teflon, SPI pistons have a molybdenum compound coating. Maybe that is what teflon is? It is supposed to give a little extra slipperyness while breaking in.
I have had good luck with the coated SPI pistons. They can be bought for less money than the OEMs too. I have seen posts from guys who hate the SPIs and won't run them. Also I have only seen one OEM have a problem that wasn't fuel or oil related. So I guess it boils down to what you can get and how much of a hurry you're in.

 

[Rixster]

x2 on the spi pistons. I have had no issues with them at all. They seam to be a great piston.

 

[mp_2009]

alright well where can i get these pistons

 

[CatWoman]

I researched this when buying for our sleds. I didn't see any negatives to these at the time of my researching, and actually found peeps whom were running them with their turbos and no trouble.

I bought ours from eBay.

 

[mp_2009]

spi

i found an entire top end kit for my 900 king (SPI pistons, wrist pins, circlips, caged top end bearing, and top end gasket kit.) 219 bucks good deal ????

 

[mp_2009]

Don't know about teflon, SPI pistons have a molybdenum compound coating. Maybe that is what teflon is? It is supposed to give a little extra slipperyness while breaking in.
I have had good luck with the coated SPI pistons. They can be bought for less money than the OEMs too. I have seen posts from guys who hate the SPIs and won't run them. Also I have only seen one OEM have a problem that wasn't fuel or oil related. So I guess it boils down to what you can get and how much of a hurry you're in.

just wondering but what was the bad that you have heard about them and also i know cats break in method dont really know if i agree with it how do you guys do it

 

[Idcatman1]

There was a post recently about Wiseco pistons in the performance modified section and one reply was that someone had had locating pins come out on the SPI piston. I have never seen that but won't say it can't happen. I have had it happen plenty on Wisecos and OEM Arctic Cats. For break in I just hone the cylinder lightly and put maybe a pint of oil in the gas tank and take it easy the first ride.

$219 is OK for a set of pistons with the gasket kit if you need all the gaskets and the bearings. You rarely do. I found some on eBay for $144 plus shipping for just two pistons.

 

[mp_2009]

cylinder

i also need to know if the jug is okay all the motors ive been around that had to be rebuilt also need a new jug but i dont think mine is nearly as bas is there a standard on the nick plating ?? what should i look for???

 

[Idcatman1]

If there are no chunks of nicasil missing or gouges in the plating you should be OK. Aluminum from the piston stuck to the cylinder wall can be dissolved with muriatic acid. As long as your cylinder wall is smooth above where the piston ring s travel I would run it. If you don't have a hone a touch up by hand with fine emery cloth will suffice to break the glaze to break in new rings. You don't need to worry too much about taking all the nicasil off. You could grind away with emery cloth for days without wearing through. If the nicasil is intact it will hardly ever be worn enough to warrant a replate or a new cylinder. Hope this answered the question.

 

[mp_2009]

i think it would be okay to run it but im gonna run it to the cat dealer and see what they say they'll probably tell me i need a new one they seem to work that way

 

[snowmanx]

i also need to know if the jug is okay all the motors ive been around that had to be rebuilt also need a new jug but i dont think mine is nearly as bas is there a standard on the nick plating ?? what should i look for???

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