gearing help? Options

[bitter-fitter]

I have been reading this posts for awhile, but I need to add you for myself finally. I have a 2001 xcr120 for my son. Bought it used and it seems SLOW? I understand he has it on grass, but it is all stock and barely moves. My son is only about 30lbs. I am thinking this thing is either screwed-up in the throttle area(governer) or just needs some modifications to it. Can anyone tell me what these should do stock? hould a five year old be able to at least ride this thing around on the grass? If I decide to change gears; where do I start? I am afraid if I raise the top speed I am going to lose the bottom end. This thing already has no bottom end! HELP!!

[Shawno]

I have been reading this posts for awhile, but I need to add you for myself finally. I have a 2001 xcr120 for my son. Bought it used and it seems SLOW? I understand he has it on grass, but it is all stock and barely moves. My son is only about 30lbs. I am thinking this thing is either screwed-up in the throttle area(governer) or just needs some modifications to it. Can anyone tell me what these should do stock? hould a five year old be able to at least ride this thing around on the grass? If I decide to change gears; where do I start? I am afraid if I raise the top speed I am going to lose the bottom end. This thing already has no bottom end! HELP!!

As I have said in many other posts I do not know much about the Polaris 120's.
That being said, here are some of the things I would check for:
There is usually a speed adjustment screw on the throttle stop at the carb take a look there see if you can adjust it out.
The throttle cable is tight the sleeve may be moving when the throttle is pulled.
If your fuel filter is clogged.
If the airbox has any obstructions (mouse nests)
Exhaust for any obstructions.
Something limiting the swing of the throttle.
Track to tight.
Brake band hanging or misadjusted.

There are a few things to start with.

[bitter-fitter]

You are right on. Thanks! I check those things and the governor rod was hitting the carb where it goes to the carb butterfly. I moved the linkage rod away from the carb and it works great!! Thnaks again. The rod was stopping the throttle at about 1/4 way!!
I still need help figuring out which way to go with some gear ratios now.

[Shawno]

You are right on. Thanks! I check those things and the governor rod was hitting the carb where it goes to the carb butterfly. I moved the linkage rod away from the carb and it works great!! Thnaks again. The rod was stopping the throttle at about 1/4 way!!
I still need help figuring out which way to go with some gear ratios now.

Don't worry about it I'll tell anybody what I do to the sleds. I'm a firm believer in "Its the rider not the sled".

You may want to have a few rear gears with you to adjust the day of the race.
I am basing this on a stock 10 tooth clutch.
On a flat wide and long track rear gears would be 39 tooth and as small as a 36 tooth (36 tooth lots of speed slow start)
On a short twisty track with some good hills 42 tooth and as large as 44 tooth (44 tooth tear your arms off out of the hole but no top end)
Track wheel kit.
Loosen the track.
Align the track
Lots of cooking oil on the slides use a spray bottle (don't let it freeze or you will spend $30.00 in gas idling your truck with the heaters on high to defrost the bottle before the race).
Spray the cooking oil into the tunnel and on the snow flap this will help prevent carrying excess snow around. (More weight = Less power)
Check the brake band to make sure its not rubbing when not in use.
Warm engine up with the hood open or off.
Open hood to let engine cool between heats. (if its a cold day keep engine running but with hood up)

I will be assembling a tech tips list with all I know (almost all (IMG:style_emoticons/default/whistle.png) ) and what I do to the sleds on our race page in the next few weeks.
I am still learning there are a ton of tweaks that can be done I do not know them all but I will pass them along as I go.