Do you need a bigger pilot jet for a Roadstar?
from the exhaust during decel, you may need to install a bigger pilot jet. First you want to be sure that simply backing the PMS out a bit more doesn’t fix the backfiring. If adjusting the PMS doesn’t fix it, installing a bigger pilot jet often does. Then you may need to reset the PMS to a slightly lower setting to bring the idle mixture
How does the pilot circuit work on a Roadstar?
The pilot circuit regulates the fuel mixture at idle and small throttle openings, typically under one-quarter throttle. The pilot air and it serves as a fuel/air ratio modifier and emulsion improver. This system can only deliver fuel to the engine by utilizing a strong intake vacuum to “suck” the fuel from up the float bowl.
How does the needle jet work on a Roadstar?
As the needle jet increases. So air and fuel are delivered to the engine with a carefully controlled coordination between intake vacuum, air volume and air velocity under the slide. tube, the velocity of the gas increases and its pressure drops. The area of the carb throat containing the slide is
What happens when the throttle is opened on a Roadstar?
As the throttle is opened, the strength of the intake vacuum drops as a controlled amount of air rushes in to fill it and the weakening vacuum moves upstream of the throttle plate. The resulting
How many pipes are in a Yamaha Road Star?
Each pipe would be mounted, run on the dyno, ridden on the street, and measured with a decibel meter. Our long-term Road Star was equipped with a Baron’s Big Air Kit and revised jetting (175 main jet, 35 pilot jet, and clip position of four).
Is there a road star pipe in Bub?
Bub (which also has a cool 2-into-1 Road Star pipe), after originally saying there wasn’t a pipe available for our test, was able to participate because a pipe due to be shipped to a paying customer was slightly dented and, therefore, failed quality control shortly before our test date.
Why do I need a road star exhaust system?
When we contacted pipe manufacturers, we told them we were using a Road Star to conduct an aftermarket exhaust test that would be judged on looks, performance and street-reasonable sound. Based on those considerations, manufacturers were free to send us anything they wanted.