February 22, 2011

Tzr250 1KT, another one modified YPVS controller

A couple days before, I received a gift from my friend Bill (aka Rusell), a stock 1KT controller that he used to keep as a spare. I just modified it and keep it on hand... new kinky red dip switches on board.
A modified YPVS controller, gives full access to the timing cycle of the exhaust power valves. By reprogramming the ypvs controller, there are lots of gains in the middle-top rpm range, as Yamaha had linearity in mind when bikes left the factory. 

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