MCB Performance News

In the continuing development of our pistons, one of the
things we were not happy with was the durability of the skirt coatings.  We have witnessed this coating come off on fresh
rebuilds with very little time put on the motor. This leaves the piston skirt
susceptible to damage as a result of several possibilities during warm up and
normal operation. Working with a coating leader we have found a coating that
not only last, but changes the way two stroke snowmobile engines are built. Our
coating is applied to a thickness that creates a minor interference fit to the
cylinder. This is done by design for the following reasons and results.

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Upon initial start up the coating interference
burnishes itself in, to create its own tolerance, shape, and perfect match to
the given bore.

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When the burnishing process is completed, the coating
maintains an ideal oil film to reduce friction and protect the piston to bore
interface.

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The operating clearance is reduced to an absolute minimum,
having less piston slap, and making the motor quieter.

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The closer tolerance motor creates a more efficient
pumping action of the two stroke design, creating a better fuel charge and more
efficient and powerful motor.

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The durability and bonding strength of this new coating
is unmatched by any coatings we have even seen. This means the coating will
always be in place to protect against any potential cold seizure issues,
ingestion of foreign debris, water, or snow dust which in most cases would wash
down or scare a bare aluminum skirt, creating even less ring seal and loss of
performance.

Our MCB dual ring pistons continue to prove themselves with
the majority of owners switching from single to DUAL RING everyday. This new
coating, along with the many other advantages our dual ring design offers,
makes this an even further separation in leading performance from the
competition.

Also new for the 2010 – 2011 season. MCB is offering the
addition of oiling holes on the 2001-2007 Ski Doo 800 (793cc) Generation 3
motor pistons. These oiling holes provide better lubrication and therefore
cooling to the critical intake and exhaust bridges where the piston tends to
run the hottest. These new oiling holes combined with our new coating, and
proven dual ring advantages make this the best piston money can buy for the Ski
Doo 800! With these improvements MCB now offers a limited warranty on all our
exclusive dual ring designed pistons!

For Ski Doo Models 600HO, 800 Non HO and HO and 800-R models MCB offers industry leading Dual Ring piston design. Original equipment on these models is a single ring design; these single ring designs experience some reliability issues. Our dual ring design is a proven fix for considerable reliability improvements over the stock design. These dual ring pistons are sold and used all around the world from trail riders, to hill climb racers, water cross racers, etc. etc. etc….The advantages are:

• More effective heat dissipation from the piston due to the dual ring lands.
• Improved overall ring seal for complete combustion.
• Considerably less power fade due to heat soak.
• Reduces backfire that is sometimes seen after shutting the sled off.
• Reduces the need to open the throttle at warm start up.
• Dual rings stabilize the piston within the cylinder more effectively reducing piston slap and skirt wear.
• The pistons ability to dissipate heat more effectively reduces the possibility of detonation caused by heat, low octane, ethanol, overall poor fuel quality.
• Our rings are Alloy steel, ferrox coated chrome faced.
• Pistons are hypereutectic cast, high silica content for proper hardness and less prone to cold seizure.
• All pistons have MOS2 (Teflon-molybdenum) coated skirts, and HRB-105 hard anodized

Individual Piston kits include: One Piston, Two rings, Wrist pin, and wrist pin circlips. $125.00 each

Complete piston kits include: Two pistons, four rings, two wrist pins, four circlips, two caged needle bearings, and a complete top end gasket set for $299.00 Retail. All complete kits include a full set of instructions for installation and ring end gap, cylinder wall clearance specifications.

Applications for Dual Ring include…

• 2003-2007 600HO models carb and SDI 72mm bore (all)
• 2001-2007 800 non HO and HO motors 793cc, 82mm bore (all).
• 2007-2010 800-R mono block motors