Honda's entry in the 250 cc motocross party transitioned from from the two-stroke CR250 to the four-stroke CRF250. The CRF adopted a Look-alike exhaust step. Moreover to the inventory transaction, many after-market performance manufacturers beget all the more higher performance dual exhaust upgrades for the CRF. Inventory or after-market, the performance comes primarily in influence and torque.
Head Flow
The decisive to building horsepower in a four-stroke engine is maximizing sense flow: bringing original Gauze/air charge into the combustion Hospital ward, combusting it and expelling it nailed down exhaust ports. The larger the heads flow, the in a superior way the maximum hidden horsepower. On the other hand once the exhaust Gauze leaves the exhaust Harbour, the exhaust step may even be a restriction.Another benefit of having two shorter exhaust pipes rather than one larger pipe and exhaust canister is centralization of mass. The engine is the center of mass on the CRF. Because the mass of the new system is closer to the center of mass, it slightly improves the handling and maneuverability of the CRF.
While the exhaust may be only one of many changes to increase power, if isolated, it would in itself increase maximum horsepower.
Torque
In four-stroke motors, like the CRF 250, maximum horsepower is obtained by maximum flow. However, maximum torque is not achieved by maximum flow. The length of exhaust pipes play a part in tuning the torque characteristics of an engine. Having two, smaller exhausts, rather than one larger one, allows for shorter exhaust and more flexibility in designing the length of exhaust to maximize torque with exhaust waves.
Centralized Mass
It must accomodate the maximum flow of the belief. Dual exhaust systems can accomodate higher intellect flow, which breakthrough the maximum possible competence of the engine.
