Helmet Fit

Helmet Fit
Michael Trulen

There's more to fitting a helmet than just buying the one that matches your hat size or guessing at “small, medium or large.” However, hat size is a good starting point. Measure your head at its largest circumference – usually just above your eyebrows in front, over your eyes and around in back. Try it several times so you know you've gotten the largest number. If your head size falls between the numbers listed, use the larger size. Most helmets are marked and sold as S, M, L or XL, so you may need to contact the manufacturer for size equivalents. Helmet sizes vary among manufacturers and model types.

The Best Way to Try on Your Helmet

Hold it by the chin straps. The bottom of the helmet should face you with the front pointing down.
Put your thumbs on the inside of the straps, balancing the helmet with your fingertips.
Spread the sides of the helmet apart slightly and slip it down over your head using the chin straps.

The helmet should fit snugly and may…

2017 Polaris Ranger 570 full-size walk around


Dyno Tuning

Dyno Tuning Larry Strangfeld

What is a Dyno and what can it do for me? A dyno-short for dynamometer, is simply a machine that we strap your motorcycle or ATV on so that your drive wheel(s) spin a drum on the Dyno. One of the functions of the dyno is to read horsepower; it does this by measuring how fast the dyno drum accelerates, then calculates horsepower, taking into account the atmospheric conditions. To get good data, this should be done as close to a 1 to 1 ratio as possible. (Example: a motorcycle with a 6-speed transmission, with 6th being overdrive, we would use 5th gear for dyno runs.) Having said that, as long as you consistently use the same gear for all dyno runs, the data gathered will be consistent and reliable, and therefore, very useable for tuning. Horsepower numbers usually get all the attention, buy in my opinion, the most important function of our dyno is the exhaust gas analyzer.  This tells us air/fuel ratios, and more important, at any RPM and percentage of thr…