2007 Yamaha Virago Pilot Jet Mod

The 250cc Yamaha Virago I worked on a year ago hasn’t been driven much because it has always ran poorly. The clean out I did back then helped a little but it still had problems taking throttle off idle when cold. It was running too lean. Not enough fuel in the air fuel mixture. I had read about people opening up the idle or “pilot” jet on these 250cc bikes and I thought I’d give it a go. Well, I’m pleased to report that it worked!

This is where the pilot jet screws into the carb body, inside the float bowl.

I used a small beading needle to ream out the hole in the jet.

This is the hole after reaming.

…and here’s the video! Keep on hackin. 🙂

About Dino

Self taught electronics and hardware hacker.
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