New wrist pin bearings?

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yz400ex

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Feb 8, 2009

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• Jan 20, 2010

• #1

I am going to be doing the top end of my 900.. I am used to buying piston kits that come with wrist pin bearings included, but the Polaris OEM pistons do not come with these.. They are sold separate. Is this because it is not necessary to replace them when replacing the piston and rings or is it just because they didnt want to include them so they can get every dime out of you when it comes to buying parts? I guess my question here is do you guys replace the wrist pin bearings when you replace the pistons?

 

skibreeze

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• Jan 20, 2010

• #2

When replacing pistons once a month, like on the new 800's, I reuse the bearings. If you are replacing them after 3-4k miles I'd replace the bearings.

 

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dmaxd2500

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Sep 29, 2009

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G WYO

• Jan 20, 2010

• #3

Ya, I'd replace them. Cheap insurance if nothing else. Makes me feel better inside.

 

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yz400ex

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Feb 8, 2009

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• Jan 20, 2010

• #4

Yes definitely cheap insurance and I will replace them.. Just wondering if everyone else does and why that is the 1 thing not included in the piston kit..

 

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dmaxd2500

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• Jan 22, 2010

• #5

Ya know, that's a good question. I wondered the same thing when I did my rebuild. IDK.

 

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ak2co

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denver,co

• Jan 22, 2010

• #6

because polaris knows you are only gonna get 500 miles on a set of pistons After the 3rd set you are suppose to get pissed and get a new sled.

 

triple650

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• Jan 22, 2010

• #7

ak2co said:

because polaris knows you are only gonna get 500 miles on a set of pistons After the 3rd set you are suppose to get pissed and get a new sled.

Click to expand...

are you trying to be funny? or?

 

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yz400ex

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• Jan 22, 2010

• #8

ak2co said:

because polaris knows you are only gonna get 500 miles on a set of pistons After the 3rd set you are suppose to get pissed and get a new sled.

Click to expand...

The set of pistons in this sled currently have over 3K miles on them so I would say they cant be that bad..:beer;