Re: Gummed up carb never rebuilt a carb

Posted by DavidPackard On 2020/3/29 11:41:55

John

I'll also recommend not to remove the throttle plates unless it is the last resort.

Soak the carb in solvent for a good amount of time. I use lacquer thinner most of the time, although for freeing-up shafts penetrating oil might be a lot better.

I believe the WCFB features a means to inhibit the opening of the secondary plates until the primary shaft has rotated to part throttle, Also featured is a means where the secondary shaft, if bound, will not inhibit the primary shaft of achieving full throttle. If bound, the force on the secondary linkage is limited to that provided by a short spring.

Be sure the primary shaft is at full throttle and attempt to assist the spring force opening the secondary plates. Temper your zeal! Use light taps, and taping the shaft side to side might help.

I bought a small ultra-sonic cleaner to convince some of the carburetor junk to come out of the internal passages. This is done with 'Simple Green' and water. The cleaner has built-in heaters with an adjustable thermostat which I set to about 100-120 F . . . just so I can touch the parts. I had to change the water about every hour because of the filth.

dp