Yamaha SUPERJET 701 TWIN
comes stock with individual tuners similar to the 60 twin, makes 73 hp , with twin 38mm carbs and several other similarities to the 45.
Difference is in the late nineties RD Performance figured out a exhaust the worked from 3,500 rpms up. I was fortunate enough to talk to the engine guru there several times. He said they filled up a 40ft trailer with test pipes. They end result was a pipe that bumped a stock 73 hp Yamaha up to 100hp. In 1999 and 2,000 RD dominated every heat of the Worlds with that pipe. On a ported Yamaha they sell the pipe in a kit and gaurentee 140 hp from 7,400 to 7,800 along with arm wrenching acceleration. They said they could make more power but the drivers want acceleration. I have one of the pipes never used it or RD race porting specs. Just running rec specs. Stock Super Jet Exhaust opens at 89 deg ATDC Transfers open at 120/118 deg ATDC .
Bookmarks