i'm about to replace the rear sprocket on a 2003 polaris 50 (35 to a 30)
is there anything i need to know?
also i assume that i will have to shorten the chain can i do this or do i have to take it somewhere
thanks

 

As for shortening the chain if you cant make up for the extra length with the chain adjuster's(which will lengthen wheel base and improve high speed stability) you will have to shorten it. My method for shortening chains requires a bench grinder. Once I have established the link to be removed, I grind down the pins below the face of the link plate and then pry the link off with a screw driver. Just like when you remove a master link. You need to be sure that you grind the pin's below the surface of the side plate so the plate can come off.

 

I've been told many times that if you replace any sprocket, you should replace its other sprocket and its chain as well. There are many different chains on market. Some go with stock chain, some go with an "H" rated (heavy duty) chain and other's go with the DID chain. Regardless of what chain you go with, ensure you also use its matching Master link. And install the link with its open end facing the back of the mini. If you are doing lots dirt / dust and sand riding, many recommend using wax, instead of chain oil. The wax's non-stick material tends to repel crud and thus, the chain & sprockets lasts longer. While changing sprockets and chain, you may want to consider installing a Spring Loaded Chain tensioner. We installed a Spring Loaded Chain Tenerioner on our Pred-90. I now recommended Spring Loaded chain tensioners on all chain driving quads. That's how impressed I am with its results.

To shorten a new chain, you can use a Chain Break tool. This is a little tool that's used to pop its pins. Once you buy this tool, you'll have it for life. So, it's well worth purchasing. For a visual of this tool, surf: http://www.speedpartz.com/chain_break.htm

* Note: Chain break tools come in many different designs and price ranges. Pick the one that best matches your chain thickness & expected future usage. RE: Don't need to purchase an industrial rated tool if only going to use it 8 times during the life of your mini.


Hope this helps...

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Don't worry about changing the front sprocket. I would get a new chain if the other has any time on it. When you put the tire hub back on and tighten it up, run it tight, back off then snug up to the next pin hole. If you muscle it up tight, it will bind up the carrier and rob power.