WHAT IS IT? The 2022 KX112 is an all-new model for Kawasaki, built to race in the Supermini class and based on the previous KX100 two-stroke. To work with the new KX112 engine, Pro Circuit has developed a new Platinum pipe and Works R-304 shorty silencer to boost power on Little Johnny’s new Supermini. 

WHAT’S IT COST? $323.95 (platinum pipe), $171.95 (R-304 silencer).

CONTACT? or (951) 738-8050.

WHAT STANDS OUT? Here’s a list of things that stand out with the Pro Circuit 2022 Kawasaki KX112 Platinum pipe and R-304 silencer.

(1) KX112. New for 2022, Kawasaki introduced a Supermini-specific, KX112, big-wheeled two-stroke. The Supermini class has a displacement limit of 112cc, and to compete at the highest levels, KTM, Husky, GasGas, Yamaha, (and previously Kawasaki) owners had to modify their 85cc (or 100cc) engines to get maximum displacement. Kawasaki’s newest model is one step closer to being ready to race off the showroom floor, but it still needs some work. The Pro Circuit pipe and silencer were created to easily replace the stock pipe and silencer to boost power immediately.

(2) Platinum pipe. The Pro Circuit Platinum pipe offers the same performance gains as the popular Pro Circuit Works pipe, but it utilizes a platinum plating on the body (rather than an unplated oiled metal finish) to protect it from everyday elements. The Platinum pipe is a unique fusion of power, elegance and utility that offers improved performance and durability with its electro-less nickel-plating finish.

(3) Silencer. The Pro Circuit R-304 silencer was developed as a full-race two-stroke silencer, and it’s available for full-race YZ125s and 250SX engines, as well as mini machines such as the KX65 and KX112. The compact design of the short aluminum canister offers optimum performance gains and is recommended for closed-course racing only. Hex-head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer.

(4) Stock power. The stock KX112 is quick but not KTM quick. Off the bottom, it loses slightly to the KTM, but the biggest difference between the KTM and the Kawasaki is between 9000 and 12,000 rpm. At peak horsepower, the KTM is 1-1/2-horsepower stronger than the Kawasaki. In stock form, the KX112 peaks at 24.96 horsepower and 11.6 foot-pounds of torque. 

(5) Pro Circuit power. With the Pro Circuit pipe and silencer, the dyno numbers confirmed our mini test riders’ track-tested opinions. The bottom end of the KX112 wasn’t affected by the bolt-on Pro Circuit exhaust, but the mid and top were significantly improved. Our test riders mentioned that the bike felt crisper off the bottom…but not any faster. But, once the KX112 hits 8000 rpm, the Pro Circuit Platinum pipe and R-304 silencer begin doing their best work. The Pro Circuit-equipped KX112 pulls stronger through the midrange to its 11,600 rpm peak where it hits 25.9 horsepower, 1.5 horses stronger than stock. The Supermini also gained more torque as well, bumping it to 11.9 foot-pounds. 

WHAT’S THE SQUAWK? No complaints. 

MXA RATING: The Pro Circuit KX112 Platinum pipe and R-304 silencer are both made in the USA and perform as advertised. They offer more horsepower in the mid-and-up ranges. There are two types of riders who need this exhaust system. First, fast mini racers who are getting the most out of the KX112 and want more. Second, anyone else, regardless of how fast they are, who wants that distinct factory Pro Circuit sound that comes with an R-304 silencer. 



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