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Engine CR125 Parts


Alden A3-12 125cc Short Track Silencer

The A3-12 125cc Short Track Silencer - Developed for increased low-mid range power for Honda Cr125 Shifter Engines. The power/ torque curve is for short tight size sprint tracks .5 - 1.0 mile. CLICK FOR MORE INFO.

Market price: $180.00 save 15%
Inlet Diameter
FTP CR125 O-ring Exhaust Manifold (90-02)
New & improved! Eliminates leaks, no more RTV!!! Fits 1990-02 CR125's. May also fit up to 2007 with minimal modifications, mostly elongating a mounting hole.
Market price: $34.95 save 10%
Hegar Honda CR125 Air box / filter mount
Air Filter & Air box mount support for the spec and Open 99 Honda CR 125. This Stainless steel bracket with foam padded cradle and bungee fasteners will work with straight or 5 degree RS Honda manifolds or the 30 degree stock intake manifold as allowed in IKF, WKA and SKUSA, it bolts to the large rear motor mount bolt. Comes as described, very clean and easy to deal with. Keeps the carb and air cleaner from falling off under rough track conditions. Note: Filter not included.
Market price: $65.00 save 25%
Optional Filter
Hegar R4 & SK-1 Pipe & Silencer Mount Kit
The Hegar mount is the hottest pipe mount. Front and rear brackets and stainless steel cradles ready to install on your spec Honda CR 125. Fits the RLV R4 or the SKUSA Pro Circuit SK-1 pipe.
Market price: $92.95 save 25%
Select Year Cylinder
KVR CR125 Engine Mount
KVR mounts are the most durable CR125 mounts, made of lightweight, TIG welded, yellow zinc plated, 4130 chromoly.
Market price: $244.95 save 20%
Frame Spacing
SRS CR125 Carbon Fiber Reeds (Includes 1-spare reed)

Race winning reeds from SRS engines. Include 2 reeds, 2 stiffeners & 1 EXTRA reed). There are many small items that go into prepping a powerful reliable stock CR125 engine for shifter kart racing. One item that is optional for stock engines under SKUSA rules is the reeds. There was a favorite reed setup for the 2001 and 2002 reed cages previously allowed by SKUSA, but what about the 1999 reed cages mandated for 2010 competition? Do the type and style of reeds really make a difference on the 1999 reed cage? SRS decided to find out by running dyno tests on a wide range of reed combinations, thicknesses, and shapes. The tests were quite enlightening. Although the stock reeds are surprisingly powerful, combinations of shape, thickness, construction absolutely make a power difference. However, one really surprising result is that most of the special combinations tried were more durable than the stock reeds during the tests. Some of these combinations are less powerful than stock and some produce more power than stock. Through a process of trial and error a reed setup emerged as the best performance setup. It is named the SRS Engines Dyno Select reed setup. The SRS Engines Dyno Select reeds were completely reliable during testing and produced and average of about ½ horsepower more that the stock reed setup from 11200 to 12400. That is passing power.

Market price: $125.00 save 25%
SRS CR125 Power Valve Plug Set - 2001

Top performing, precision, investment cast power valve plugs for the 2001 CR125 cylinder are now available from SRS Engines.

The shape of the exhaust duct in the 2001 cylinder is critical to power production. The stock 2001 power valve shape sacrifices peak power to give the engine a broad motocross power band that has good response as low as 6000 rpm. Since stock 125 shifter karts operate above11000 rpm most of the time, they can ignore low rpm power in trade for power gains above 11000 rpm.

SRS has identified the duct shapes in the 2001 cylinder that give top level performance in the shifter kart rpm range. These shapes have been captured with computer solid modeling techniques and incorporated into the SRS 2001 CR125 power valve plugs.

A precision investment casting process was used to preserve the shapes of the solid models with a high degree of accuracy in the production power valve plugs. When the plugs are installed in the cylinder and properly blended for smooth transitions between the cylinder and plugs, the maximum power potential of the stock 2001 cylinder can be achieved.

Detailed instructions included.
Market price: $169.00 save 20%