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February 2013 Ask the Experts

Crank up the advice machine!

Polaris 800 rush uses water-cooled Phantom brakes that have a mono-block bridge for high stiffness and low piston retraction to resist fluid boil.
Air or Liquid Braking
Are there differences in the Polaris braking systems? I read in one of your magazines that there is an air- and a liquid-cooled version. Just wondering what the differences are. – madvmax

A Both air and water-cooled versions have a mono-block bridge for high stiffness, a thin-wall stainless steel high-performance piston to resist fluid boil, an open top caliper to allow ram air to be effective, have top load pad installation and removal (NOTE: Caliper removal not required, no tool required for pad pin removal and there is one finger quick pad pin release with a hook on the pin to help remove pads), both have extended life sintered friction material, and optimal internal cross porting for quick manual bleeding. The water-cooled Phantom has a mono-block bridge that allows water-cooling to be effective on both sides of the caliper and low piston retraction for race applications for improved lever response. – Lee Pfeil, HB Performance Systems project engineer
Large Reed Advantages

What is the advantage of welding twin Ski-Doo reed cages in the 809 base? Is this to feed a big Crank Shop-style cylinder, or is it an asphalt (racing) thing where the air is not as great? – max rotax

A The advantage of using a larger intake (reed cage and reed) is to maximize the air intake. The older triple cases used a smaller intake years ago. Today’s technology is capable of producing more hp than the stock intake. There also have been huge advances in carburetors that can use the larger intake. About 10 years ago a 46-48mm carburetor was large, but there are now carbs in excess of 65mm. – Jason Houle, Straightline Performance
Right Stock Compression

What is the stock compression for a 2004 Ski-Doo 500SS. I am at 125 a jug and just wondering what it was new? – Andrew Liberatiscioli

A The stock compression is 12.5 to 1, but the cranking compression can drastically change from gauge to gauge. The 125 lbs. that you are showing seems to be an accurate number and would suggest the engine has good compression. – Jason Houle, Straightline Performance
DIY Jet Changes

I have a 2000 Arctic Cat 800 triple and was wondering if I should try to change the jets myself or go to a pro. – Paul Jordan

A Changing jets is not a difficult task as long as you know what jets you need to put in. If there is any doubt in the size jet you need or your mechanical abilities, we would recommend taking it to a pro. When choosing to do your own mechanical work, be cautious of the possibility of mistakes. Cleaning or changing the jets in your machine can be detrimental if done wrong. We would suggest that sled owners always have a professional make jetting changes. – Experts
Race Gas to CC Heads

What is the best liquid to cc my heads on a PS 1000? – eightpilot

A Installed or uninstalled we have always used a race gasoline fuel with at least a 20 to 1 oil mixture. If any liquid were to seep into the case it will not cause any issues during start up. The thinner liquid is also faster and more accurate to measure in head corners, for uninstalled. – Jason Houle, Straightline Performance
Rod Pluses

Q Is there any advantage going with Titanium connecting rods instead of stock rods on a 2-stroke race engine? – Zackster

A Titanium connecting rods will lighten the rotating mass inside the engine, allowing the engine to spin up to rpm quicker. It does not normally create higher peak horsepower, but allows the engine to be more responsive to throttle inputs. On extreme rpm race motors, the benefits can be substantial as the piston has to stop and reverse direction at the top and bottom of each stroke. Where the connecting rod is attached to the piston, it is part of the weight equation as the top of it has to reverse direction as well. However, the balance of the crankshaft will be affected, so it would be wise to have the crank assembly balanced to compensate for that. – Jerry Mathews, Starting Line Products
REV engine swap

I’m pondering the idea of swapping the engine in a 2003 440x Ski-Doo REV sno-crosser with a 1998 Ski-Doo Formula 3 engine. Would there be any interference problems with the 3 into 1 exhaust system or longer engine block? – Jerome Farrar

A This has been done by many people throughout the last 10 years. It is an achievable goal. If done correctly, we have seen firsthand that the sled can perform great. There are a couple performance companies that have produced engine plates and triple pipes to fit into that chassis. I suggest poking around on the AmSnow forums ( to find a person who has done it themselves. This would minimize any small problems if attempting this yourself. Or you can always call us at 651-466-0212. or email us at – Jason Houle, Straightline Performance
Adding a single pipe and Power Commander fuel controller can improve acceleration and throttle on a 2010 Polaris Rush.
Bump up power
What is the best way to improve performance /horsepower on a 2010 Polaris Rush? – Shawn Wiley

A The Polaris 800 is slightly underpowered when compared to the other brands and several independant dyno evals have proved this. The easiest and most cost effective way to improve the horsepower is adding a new single pipe along with the Power Commander fuel controller. At Straightline the package is a simple bolt-on that requires no other changes. Other companies have options as well. Ours improves the power by about 10 hp. Acceleration and throttle response are drastically improved too. Typical installation is 1 hour, and price is $844. – Jason Houle, Straightline Performance
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