Modern Vespa

Hi again,
What about the apparently least expensive way to get a little more performance out of a S 150 by getting the idle jet replaced?

Any experience out there with this mod?

What will happen to my gas mileage (I must ask since this is how I justify my purchase)?

Thanks!

You can tune the factory jets for peak performance, but they should be pretty much spot-on if your dealer did the prep properly. Probably wise to first break-in the motor (600+ miles) before you start looking at performance mods, and even then you wouldn't want to physically change any of the jets without changing other pieces in the equation at the same time like a cylinder kit and/or exhaust. As you put on miles, you should notice the bike's performance increasing anyway as a result of break-in.

+1 What he said...Also it technically voids your warranty, if you care about such things...