Join Date: Feb 2005
Location: Dakota Territory
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To get to the speedo key, you first need to remove the belt. Under the secondary clutch, you will find a right angle adapter that the speedometer cable goes to. Take off the 3 nuts that hold the adapter on(I think they're 1/2"). The speedo key goes in the end of the shaft that will now be exposed, and the other half is in the speedo adapter. If it's broken, you can use a needle to fish it out. While you have the adapter off, wiggle the end of the shaft to see if the drive bearing is all right.
If the drive bearing is bad, you will need to loosen the track, take the chain case apart, and replace the bearings on both ends of the driveshaft.
2008 Polaris RMK 600-155"
2003 Polaris Trail RMK 550F(wife's)