Coughing or backfiring through your Yamaha Road Star 40mm Mikuni carburetor? Have a read of Mr Tidy’s article on how to adjust the accelerator pump and see if it helps you out.
This is how to change your main jet and needle on the stock Road Star 40mm Mikuni Carburetor.
Principles of modern motorcycle carburetor function specifically in application to the Yamaha XV1600 Road Star
The manifold must be removed from the bike for this procedure. You need a variable speed Dremel tool with a course sandpaper covered cylinder that is about” in diameter.I use the one that came as part of the Dremel kit. Use the low speed setting.This tool really “Hog’s” off the rubber! Take it SLOW AND EASY !!! At least the first time.
Mr Tidy gives us valuable tips to check the Yamaha Road Star’s carburetor float level.
Cleaning up the left hand side of the Road Star engine can be done by relocating the fuel pump up underneath the fuel tank.