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Jan 16, 2001

Tul-Aris Builder Increases Power, Reduces Vibration

Tul-Aris 780 builder Rob Tuluie increased power output and reduced vibration in a series of dyno tests held over the weekend.

According to Tuluie, fitting 2mm larger carburetors (from 39mm to 41mm) and refining the jetting on the Lofgren Racing/Manley Cycle Dynojet dyno in Minneapolis produced 152 horsepower and 96 lbs.-ft. of torque from the 309-pound machine (weighed full of fuel). The machine made 143.8 horsepower and 92.4 lbs.-ft. of torque on the White Brothers Dynojet dyno during testing for the February 2001 issue of Roadracing World.

Tuluie also reduced handlebar vibration by a factor of three, testing handlebars of varying designs and materials and fitting accelerometers on the handlebars and triple clamps to collect data during dyno runs. Tuluie plans more testing to further reduce handlebar vibration, which was so severe during on-track testing of the Tularis that Tuluie and rider Mike Ciccotto decided not to race the machine until vibration could be better controlled.