FZRSupport: the FZROnline Archive

Well the subject about sums it up. My bike's run awesome for the couple months that I've owned it. No stumbling or bogging. However I've never needed choke when cold, just a quick throttle blip and it settles right down to 1100rpm.

Does this mean the idle circuits running rich? Will it hurt my gas milage?

does it stumble between 5,000 and 6,000 RPM ? (WHILE RIDING)

you shouldn't NEED choke to start the bike anyways

Your "richness" at idle and low throttle is controlled by the IMS or Idle Mixture Screws. Some call them the A/F screws.

This should not affect normal riding conditions which are generally above 1/8 throttle.

This chart should help:

Do you know how many turns your mixture screws are at?

No the bike is not stumbling while under load nor while free revving.

I understand that you don't need to use a choke. However if the bike idles perfect while cold once the motor warms up it would be feeding an excessive amount of fuel into the motor under closed throttle. If this means that the extra fuel is washing the oil off of the cylinder walls under deceleration causing the rings, pistons and cylinders to wear I'd like to correct what I can. If the general consensus is that it's causing no harm, all the better!

Thanks for the chart Rage! Is that a generic diagram or one specific to our style carbs?

No I don't know how many turns my mixture screws are backed out. I figured I'd get some opinions before I futzed with the fuel on a seemingly great running bike!

Well, unless you're in a daily stop-n-go traffic situation, I don't believe I would be concerned.

The best way to find out though is to take it to a shop with a Dyno.