Has anyone put a 2000 Scrambler 500 cam into a 2000 Sportsman 500? I ordered one today and thought I would try it. I also plan on changing the carb at the same time, I think those are the only items that are different on the two machines. How about the rev limiter? Any advice?

 

If I recall correctly, I read in the 4Wheel Action mag. the Srambler crank journals are bigger to take the extra load. The Sportsman crank may not be upto the extra hp. Outside of this I think the only difference is the carb and cam. I don't know it the Scrambler has a different pipe??
Dave Formstone
98 SP500 EBS.

 

If you want that much more power, go to your nearest Massey Furgeson dealer and order a 70 to 80 horsepower tractor with four-wheel drive. Now that's a true all-terrain vehicle!

 

SG,
I'd go back to the dealership and have him run the part #'s on the head of a 2000 Scrambler and a 2000 Sportsman... I just wonder if the valve sizes, port configuration, cc's (not engine cc, head volume) compression ratio, and piston design is the same between the non-H.O. and H.O.
You are more than likely ok, but I would check, lack of piston to valve clearance could get expensive QUICK. Another thing, if the intake and exhaust ports can't flow the added air volume of the increased lift/duration, its gonna choke on its own sauce.. If the ports ARE the same, then you will need to buy a 40 mm carburetor to matched the increased demands of the new hotter profile camshaft. You might be able to re-jet the 34 mm carburetor on it now... but i'm not sure...
Although the idea of an H.O. 500 stuffed in a Magnum or Sportsman sound pretty cool.. Just for that extra towing capacity? lolol..

 

Go back to your Polaris dealer. Ask him to borow the parts book. Compare the Scrambler's parts #'s to the Sportsman's parts #'s.

 

My local Polaris dealer just put a Scrambler cam and a 554cc big bore piston in a 500 Sportsman. They didn't put the scrambler carb. on it. I rode it and it seemed to have more torque than stock. Not anymore top end with the smaller carb. Still not as fast as my scrambler. I'm waiting on the durability test before I put one in mine.

 

I am planning on putting the Scrambler carb on as well as the cam, went I asked the parts department about differences between the two they said that it was just the two parts that were different, I will check further about smaller items that were mentioned in outer posts. I am aware that one wants to avoid contact between valves and pistons,

 

The Scrambler 40mm carb is not exactly a bolt on. We are in the process of doing one right now and will share the info once done. The manifold adapter, throttle cable, idle adjuster have to be changed. I was fortunate to find one from Chris Picciotto who changed to an Aaen 42mm Mikuni setup on his 500HO Scram. I hope to have done in the next week or two and will share the info. We think we can mate up to the stock airbox.

I'm going to take a back seat on the cam, valves, springs, etc., for now. Polaris had lots of problems tearing up the cranks on the original motors when they were trying to get the 500HO setup right.

There is a pretty good article in the Feb '00 issue of ATV Sport Mag. about a rebuild of a '97 non-HO 500 that is basically what we have in the Sportsman 500 right now. Sounds like the new 10.5:1 Wiseco piston might be a good setup.

<A HREF="http://www.godigital-design.com/96Polaris.html">Schultz Motorsports</A>


[This message has been edited by Jack (edited 01-03-2000).]

[This message has been edited by Jack (edited 01-03-2000).]