For those of you who are completely clear about the basic principles of 2-stroke and 4-stroke engines, perhaps it's time to bone-up on the Gnome Rotary, Newcomen Atmospheric and even a little jet propulsion.

Click to see this cool interactive animated engine chart.

Here's how to find the tool kit on your 2012 Arctic Cat ProCross/ProClimb sleds.

Click to see.

UPDATED to explain the lack of "extra" washer on 4-stroke models.

It seems a few owners of 2012 Arctic Cat 4-stroke sleds are wondering if there's a Torque Control Link creating a fixed center-to-center distance between the drive and driven clutch?

The answer: Yes. It just looks different than the TCL on the 2-strokes.

Click to see.

In the wake of a handful of engine burndowns in Alaska and Canada, this last week Arctic Cat sent a Service Advisory to its dealers concerning proper set-up of all 2012 F, XF and M 800s.

Click to read about it.

If you were one of the owners of a 2011 Arctic Cat sled equipped with the 800 H.O. engine and burned 91 octane fuel, you might have been surprised to occasionally experience “Limp Mode.”

Turns out the problem wasn’t octane. It was ethanol. And now there's a fix.

Click to read about it.

Q: When I fire up my 2010 F8 in the morning, it seems VERY rich and smokes heavily. It never fouls a plug. And once it is warmed up and "cleaned out,” it runs fine.

What’s up… is this is the way it’s supposed to be?

A: Click to read

With a half-season of testing, riding and racing the Sno Pro 500, improvements have been discovered. Based on what cross-country racers have learned and changed – particularly during the I-500 – I’ve made some tweaks to my Sno Pro 500 and can verify the improvements.

Make the jump to read them..

Wishing your sled was a little bit faster?

You're probably giving up free horsepower and top speed.

Make the jump to read more.

Some important news out of Speedwerx.

First: a product recall on their early-build Z1 Turbo Mufflers.

Second: their new blog. Make the jump to read more.

Racers accustomed to white/clear plastic fuel tanks value the ease of determining fuel level. This is especially true for cross-country, where fuel stops can play a meaningful role in the race’s outcome. So when racers received their 2010 Sno Pro race sleds, there was some serious grumbling about the black-coated tanks.

SledRacer.com got the skinny on the situation, and posted about it HERE.

Have a 2010 Crossfire 800 and want optimized gearing for either high-speed or mountain riding? Read on for some recommendations.