The wiresplice and an airbox mod will immediately liberate approx 30% more horsepower, taking an average MC21 from 45hp to around 60hp.
The shaft seal on the oil pump can be a weak point, but on the whole, the injector setup is a reliable system. The seal can sometimes unseat, and move down the drive shaft. Cleaning the seal and housing, and a light smear of RTV sealant to bond it in place cures the problem. Keep the secondary oil reservoir fully topped up, and keep an eye on the level, and you will spot any problem before it becomes any real concern. If the seal moves, it drains the 2T into the transmission.
As nxrsr20 says, changing the standard chambers for race chambers can lose you quite a chunk of weight. Stock pipes are good for 65hp or more, in the right conditions, but weigh a ton! They are cheap though, and if you damage one/both in a crash, being double-skinned, they don't dent easily. They are also good for track days at places where noise limits can be an issue.
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Andy.
NSR-WORLD.COM
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