CARB ISSUES? Ask scoutpilot.

My throttle shaft had some light wear on the ends where it rides in the throttle body. It measured .3115. The body had egg shaped holes on both ends. I measured .318 with a small hole gauge. The bushing ID is .3135 making a nice running fit without play. The accel pump was set correctly at time of rebuild. The engine revs up fine without any hesitation or stumble. For some reason my kit only came with 2 or 3 rivet plugs. Thanks for the pic, I'll be sure to leave that plug alone. I'm going do the leak test and vacuum test before I tear carb back down for another cleaning. Will keep you posted. Thanks SP!

SP- just ran a vacuum test. It's pulling 17 in at idle an drops to 0 when I punch it, then spikes up to 28, then back to 17/18.

The choke is nearly closed and the needle is steady. So, you think a good cleaning is what is needed?

Thanks. It's not fully closed. It has 1/4 in air gap around the choke plate. I'm tearing down the carb now. Going to remove the rivet plugs and check to see if the passages are clogged along with all the jets.

With the new bushings I drilled and reamed in to the body, the shaft is much, much, tighter than it was. There is no perceptible wiggle in the shaft now.

I found the low speed jet clogged upon dis-assembly. It had small very fine metal shavings in it. I'm putting a new screw in fuel filter on it upon reassembly. That low speed jet has a very tiny orifice in it. I can see how that one could easily clog and thereby shutdown fuel flow to the low speed circuit. I have the bowl soaking in a vat of carb cleaner now. All the other jets seemed to be clear and clean.

luvtofish wrote: With the new bushings I drilled and reamed in to the body, the shaft is much, much, tighter than it was. There is no perceptible wiggle in the shaft now. I found the low speed jet clogged upon dis-assembly. It had small very fine metal shavings in it. I'm putting a new screw in fuel filter on it upon reassembly. That low speed jet has a very tiny orifice in it. I can see how that one could easily clog and thereby shutdown fuel flow to the low speed circuit. I have the bowl soaking in a vat of carb cleaner now. All the other jets seemed to be clear and clean.

SP - Good News. The ole gal is idling much, much better now and with the choke plate wide open. The thing that seemed to correct my issue was a simple swap out of the import metering rod for the original Carter I took out during the rebuild. I also changed the rod bolt and spring back to the original. Have not checked the differences in dimensions yet, but something must be definitely different betwixt the to. I'm still running a tad rich it seems, may need fiddle further with the rod adjustment. Thanks for all your help and sound advice!!

The next time you do this dance, look down the barrel of the carb and note if it is wet or not. Sounds like the carb is flooding out. That would be adjustment of the float (3/8" without the gasket in place.), or cleaning the needle and seat.

OK. For the benefit of those who have never been inside a WO.