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Discussion Starter #1
OK, I have searched the threads and not found exactly what I am looking for. I just purchased a 2012 Sportsman 400, and am setting it up for use primarily OVER 10,000 ft., in Colorado.

This is what I am in the process of doing. If anyone else has dialed in a 400 for high altitude use, please let me know if I am close here. I know it will take some additional fine tuning, but most of the time I live at 6,000 ft, so tuning will have to be done when I am in the high country.

1. Needle jet moved to 2nd slot (was in 3rd).
2. Fuel/air mix: removed brass plug, went all the way in, then 1 1/2 turns out.
3. Ordered two main jets, starting with a 147.5, can drop to a 145 if necessary.
4. Any change to pilot necessary? Recommendation?

Stock air cleaner, stock exhaust, no snorkel.

Now, fluids. I like using aftermarket, so don't bomb me for not using Polaris branded. I believe their is always an equivalent. These are what I am planning to use. If this is wrong, please let me know. Lots of opinions out there, but very hard to find FACTS.

Engine: Synthetic 0w-40
Xmsn: Synthetic 5w-20
Rear Diff: Synthetic 75-90
Front Diff: Synthetic Type F ATF... can use demand drive if this is not a valid equivalent. This was the hardest one to find another option for.

Thanks!
 

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Use Synthetic ATF in the front, and your trans/rear diff are bolted together, use the same fluid. Run Full syn 5W20 in the trans/rear diff, hear it works well.
 

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Here you go. TXRonnie has over 10,000 miles on his 500X2, his recipe works.

http://www.polarisatvforums.com/forums/atv-oil-lubrication-filter/55889-10000-mile-fluid-change.html#post433109

"I run synthetic ATF in the front and 5W20 in the tranny. For oil I have used both Mobile 1 and Shell Rotella T Synthetic 5W40. There has been a couple of times Wal Mart has been out of the Mobile 1 so I just got the Shell. It is as good as the Mobile 1. I am going to try the new Castrol Synthetic 0W40 in the 500 next oil change and do an analysis with Blackstone to see how it holds up. I have done one on both the Shell and Mobile 1 and they were always good and I expect no less from the Castrol.

Ronnie "
 

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Discussion Starter #5
Thanks!

Will,

I appreciate the feedback on the oil. I rode dirt bikes a lot some years ago, but just getting back into off-roading, and new to ATV's, so there is much to learn. Not to mention dialing in a carb on a dirt bike is Soooo much easier than even getting to the carb on my ATV... LOL.

Yes, Mobil 1 is my choice for my road vehicles, so I try to use it.

Thanks, Steve
 
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