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The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power.
The 950SE is KTM's response to the BMW HP2, a well-regarded high-performance dirtbike whose 1170cc 'boxer' engine made 105-horsepower.The HP2 won its first competition start in 2005 at the Erzberg Rodeo in Styria, Austria, an annual "hard enduro" race series attracting hundreds of competitors from around the world.
The air cooled engines were poorly reviewed in publications at the time, with Dirt Bike magazine most famously calling the bike "unridable" in their June of '83 issue. Kawasaki responded by lower compression ratios to make the bike more manageable and reliable, but would ultimately design a new engine from the ground up for the '85 model year.
The bike had an 11,600 rpm redline [8] [better source needed] power and torque close to its 250 cc two-stroke rivals. [1] It benefited from engine compression braking, which allowed the engine to slow the bike down during deceleration, giving the brakes a rest. [1] The 1998 YZ400F was the first bike to come stock with a Keihin FCR carburetor.
The engine was a 99 cc (6.0 cu in) single cylinder air-cooled system. The compression ratio was 9.4:1 and the bore and stroke were 2.1 inches by 1.8 inches. The whole configuration adds up to about a 10 hp output. [1] This gave the bike a friendly power curve but also plenty of torque and power for the beginner or smaller sized rider.
A compression tester. Leak-down testing is a static test. Leak-down tests cylinder leakage paths. Leak-down primarily tests pistons and rings, seated valve sealing, and the head gasket. Leak-down will not show valve timing and movement problems, or piston movement related sealing problems. Any test should include both compression and leak-down.
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3579 S High St, Columbus, OH · Directions · (614) 409-0683