A few upgrades for the polaris 120

Mar 13, 2019
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used rmk axys bumper for cheap. Should work sweat. Just need to bend up some AL for the tunnel extension. Started on the rails for the skid today. Should work well. Camso racing track is going back, it's meant to be spiked for oval track or ice drags.

It's going to need new running boards by the end of the year. I have a feeling the OEM boards are going to be too short once he figures out that standing up is way better then sitting.

4D3B77FB-3F16-4DF9-B368-9D5DD1FD2983 by Brad Taylor, on Flickr
 

Reeb

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As soon as I’m back in town I’ll throw a tape on it and address your other posts I keep trying to circle back to.
I’m sending the head down to Morelli Motorsports to get helped out. He does a lot of carting stuff. I told him I just wanted a reliable 13-15hp engine so he’s keeping it simple. Mikuni carb and a long tube header to exit out the mag side and the torque should be similar to the hp gains too which is the important part. Until I have the engine swap parts all together we’ll ride with the stock engine. It’ll be a good comparison for the Christmas holidays.

I really don’t want to but I’m almost at the point where I have to buy an expensive clutch and learn how these work because I’m not going to Jr. belt drive this thing. Lol.


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Mar 13, 2019
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Nice, I would think we are in the 10hp + range. The porting and using a thinner head gasket has to help. And the carbs. These engines are soooo lean in stock form to meet emissions. Next item for me is going to be a new cam. These engines have a plastic cam gear that I suspect will wear pretty quick at higher RPMs. I think the kids will out grow the sleds before the engines give us any trouble

I think clutching is going to be the problem on these little sleds. I've been looking at "Chinese" option on ali express. Prices come way down but I don't know about quality etc. It's the problem of wanting to have it geared low for the powder but then geared high for the trail.

Found a good price on the track today and have the OEM unit coming for thursday.
 
Mar 13, 2019
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got some work on the skid done today. I am going to hold off on doing the cut outs for the rear wheals and adj mechanism until I have the track in hand. A little heat with the torch and some bending and they came out really close. Stock one beside it for reference. It is also a full inch wider. Had to remake all the lower bars.

I went 12" longer. 93" - 69" = 24" divided by 2

0C5AFCB4-793A-4EC2-8C01-82A102C8ADEE by Brad Taylor, on Flickr

08FE84A0-F897-4744-B1FD-ED57E2BCF2DC by Brad Taylor, on Flickr

862B7D29-0F00-4574-9794-2F465E029B70 by Brad Taylor, on Flickr
 
Mar 13, 2019
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well I started adding up receipts on these darn modifications. Hhhmmmm It's something you're NEVER supposed to do....

I'll break it down once I get everything together but it will be interesting to see if the cost is close to the Arctic Cat ZR200 and what the performance will be versus that sled. It won't be quite apples to apples but it will be close.

Sure like this new track driver for the polaris track. old vs new


EE556BA9-DC68-4667-8AC9-0BA9DEC2E1E5_1_201_a by Brad Taylor, on Flickr
 
Mar 13, 2019
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picked up the proper track got my igrip studs for the short track. Did a 2-2-2-3 pattern down the center. It's going to hook up nice on the trail. :) Phone died and I didn't get pics. I have to pull the motor again as I think I installed the cam 180 degrees out, silly mistake. And this is my 5 year old pondering when it's going to snow again....

BEA9C339-E52B-43FF-B86E-FD198138ED00 by Brad Taylor, on Flickr

F06B2783-598B-4E68-A60F-28DC17E9DC94 by Brad Taylor, on Flickr

B9A280E5-FD1D-487C-9A6C-72F6DB23B2F8 by Brad Taylor, on Flickr
 
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