How much horsepower does a YZ 250f have?
38.2 hp
Powering this Japanese motorcycle is a liquid-cooled, DOHC, four-valve, 250cc four-stroke engine. We ran the YZ250F on our rear-wheel dyno to determine peak output from Yamaha’s 250 four-stroke motocross bike. We documented 38.2 hp at 12,500 rpm and 18.5 pound-feet of torque at 8,500 rpm.
How do you know when a 2 stroke needs a rebuild?
You can look at the piston as well, but any scratches/scoring that looks like something you can feel with your finger nail is damage and will most likely need repair/replacement. If you can’t see the cross-hatching on the cylinder walls then it is worn and probably out of tolerance.
Are 250 2 strokes faster than 4 strokes?
A 2-stroke engine requires only one complete crankshaft revolution to complete the four stages of combustion. A 4-stroke engine requires two crankshaft revolutions. This advantage explains why a 250-cc 2-stroke engine makes more power than a 4-stroke of the same size.
How good was the Yamaha YZ250 in 1992?
Pink, purple or mint green, in ’92 they had you covered. On the track, the YZ250 produced one of the best motocross power spreads of 1992. It offered a solid, torquey and hooked-up delivery that made excellent use of every ounce of power from its 249cc’s. It was snappy off idle and pulled well from the first crack of throttle.
When did the YZ250 249cc engine come out?
By 1992, the basic design of Yamaha’s 249cc mill had reached a full decade in use. Originally debuted on the ’82 YZ250, the YPVS (Yamaha Power Valve System) power plant had proved adept at providing a solid and torquey spread of power.
What kind of suspension does a Yamaha YZ250 have?
The swingarm rear suspension system featured more than 12″ of travel, while the telescopic inverted front forks had 11.8 inches (300 mm) of travel. In the 2005 model year the YZ250 gained a new frame made from aluminum that reduced the dry weight to approximately 212 lb (96 kg).
What year did Donny Schmit ride a YZ250?
This YZ250 from the Primm MX Collection, was once owned by American 250 World Motocross Champion Donny Schmit. As the nineties approached, Yamaha continued to refine their award-wining 1988 design. The ’89 season would see the YZ updated with a Supercross inspired 19” wheel and a switch to inverted stanchions for the front forks.