How much horsepower does a yz125 have

The octane rating helps prevent against detonation, especially in high compression engines and works well with the Apex head. VP T2 gave the YZ better throttle response and a stronger bottom to mid range pulling power. The V-Force3 system gives the Yamaha increased power, throttle response and also allows the Yamaha to rev farther than that of the stock reed cage system.

The V-Force reeds also last longer than the stock reeds and resist chipping much better. Apex Technical Innovations Cylinder Head: The objective of the Apex cylinder head is to improve upon the OEM combustion chamber shape to get more efficient combustion, while also offering interchangeability, as well as additional cooling from the billet design.

A very important parameter of cylinder head design is the squish clearance. Because of manufacturing tolerances, the stock YZ head has a pretty large squish clearance for a at around. The point of the squish band is to shield and cool end gasses from the flame front to prevent detonation and to add turbulence to aid mixing and make for more efficient combustion. This can cost you power, fuel efficiency, and make jetting more finicky. Also the flame front can creep into this space and actually cause detonation.

The Apex YZ head is designed to have a nominal squish clearance of. The msv is the speed which the fuel air mix moves across the squish area into the combustion chamber and is another very important tuning parameter. Too high and the engine will be too peaky and risk detonation and too low and the engine will need excessive advance to run right and will be slow in general. The msv, compression ratio, squish area and squish clearance all affect each other, so a lot goes into getting the right combination.

Another unique problem that the stock YZ has is the way it has a flat top piston with a large bevel on the side. This makes conventional head designs not pair well with it. Normally one would have to choose an angle to match either the bevel part, or the flat part which leads to a compromise in how the squished gasses are dealt with. Paradoxically, while not as powerful or as fast, the YZ is a blast to ride.

The added dose of power down low makes it easy to get the blue bike up to speed with nary a touch of the clutch. The weight and handling make the rider feel like Superman. A cc four stroke dirt bike can be a great bike for taller kids and smaller and lighter weight adults as the bike offers a decent seating position without having too much power.

Before you throw a leg over any dirt bike, no matter the size you should get in the habit of wearing the proper protective gear. As a lightweight pound claimed dirt bike, the Yamaha YZ presents itself as a nimble option for teens who are moving up in displacement and looking for a full-size motocross competition bike…. The F makes more power over a longer range, which can be a big advantage.

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