Gregory Bender

Carburetor return springs - lighter springs for Dellorto VHB

Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models


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There are good reasons not to put a lighter return spring inside your carburetor (e.g., the throttle may not fully returned to the closed position when you need it to). But, if you want to try a lighter return spring, Sean Flanagan has mentioned the following on the Wild Guzzi forum. In Sean's own words:

It's risky, and I absolutely don't recommend doing this, but Ace Hardware spring #182 will do the trick.

The manufacturer of the spring is Hillman.

Sean further reported the following in a private e-mail:

I also changed the pumper jet spring to a lighter one, because the (new, lighter) slide return spring was having trouble overcoming its pressure (when coupled with the friction from the cable, etc.) I didn't get an exact part number for the spring I used, but it was a hardware store spring of similar diameter, only slightly longer and with thinner wire. I had to trim a few turns off the end and also bend out the last coil so that it fit over the brass bit on the piston pump.

Rick Duarte reports that the spring is too long and coil binds when the throttle is opened fully. This prevents the slide from being opened all the way up and prevents wide open throttle.