Ok... I got pressure!!! but now the thing revs way up when i remove the choke!! whats the deal with that!! Please help!!

Maybe a blown ring?


Thanks

 

Would that be an idle adjustment? Your choke restricts air intake, when you remove the choke you are letting air in, sounds like you could limit the gas coming in, by adjusting the carb. Keep up the good work! Really like the looks of your F3.

 

Check for vacuum leaks.

Also, when adjusting the idle mixture screws you have to do the "carb dance" and balance idle speed with idle mixture. If its idling too high then adjusting the idle mixture won't do you any good as you are runninng above the idle circuit of the carb.

Make sure your throttle linkage is not holding the throttle open also

Fun huh?
Bobby

 

Turnthe mixture screw (usually in the baseplate of the carb with a screwdriver slot) all the way in just snug, don't overtighten. back it out 2-1/2 turns. (most carbs will start and run reasonably well at 2-1/2 turns no matter what type of carb) With the engine off after opening the choke press the gas pedal down or pull the linkage to open the throttle plate then release it to take the carb off high idle. Make sure by looking down the carb throat with a light that the throttle plate is closing completely with the choke off. If it isn't adjust the idle speed screw on the linkage until it closes. If the engine is cold put about 1/2 choke on, press the gas pedal to the floor and slowly release it. The idle speed screw should be resting on a stop on the choke linkage that will crack the throttle plate slightly open (high idle setting). Start the truck and keep it running with the gas pedal if necessary until it comes up to operating temperature. It should be high idling at about 800- 1000 RPM. Push the choke in and press the gas pedal ~ 1/4 way down and gently release the idle should go down to idle speed spec. I don't know off hand what a flathead idles at, but I'd guess somewhere in the 500 RPM range. Adjust the idle speed screw to the proper idle speed. To adjust the mixture screw, with the engine idling back the screw out a little at a time until the engine starts to slow down and stumble. Turn the screw back in until the engine reaches it's highest rpm then starts to slow down again. It is best to have a hand held tach attached under the hood when doing the adjusting or you can have a helper watch the dash tach. Now back the screw back out to that highest RPM setting. It is now set, readjust the idle speed screw to the proper idle speed again if necessary. If everything is right, you should be ready to drive. A better/more accurate way to adjust the mixture screw is by attaching a vacuum gauge to the vacuum fitting on the carb, and adjust the mixture screw back and forth until it is running at maximum steady vacuum reading. reconnect the vacuum line, readjust the idle speed and your ready to go.
A broken ring will not affect the idle speed. One may cause the engine to run rough, and the vacuum reading to bounce around. A stuck or leaking valve will also make the vacuum reading oscillate. Buy and learn to use a vacuum gauge. They are not expensive and can tell you a lot about the health of your engine, diagnose problems and help you to adjust your carb for best running and economy. Everyone who works on carburated engines should have one in their tool box.

 

Figured it out.... another stupid thing. The fuel accelerator pump tab thing at the bottom of the carb wasnt attached to the lower butterfly valve...letting in way to much gas and air. Well its all good now.... thanks again to you all, I would be so lost without all your help, well more lost then i am now.

It sounds real nice now...cut the baffle off! haha im such a kid. o well

O and BTW Bobby.... hell ya its fun!!! Ive got old trucks pumping through my vains


Thanks,
Alec

 

Waiting for the (promised!) video!! gotta have SOMEthing to keep me enthused on my flathead (broke the 2nd stud off today but all the rest are out).



R

 

R, sorry man... had problems with it at first then it is was to late to start her up... neighbors don't like me as it is! But I will post one up tomorrow... I PROMISE!!! HAHA

 

Good 'nuf!! I'm really getting anxious to get to some serious work on mine - got all the ridges reamed, all the studs out, except the two broken ones. Then I really get to start tearing down. Gotta clean the shop up good, first, so I can keep things organized. Hate cleaning the shop!! Always find another "project" to get done...

I was just ribbin' ya on the video, ya know...I know you have been a little frustrated over the course of the evening. I would have been, anyway!

R

 

Well got the video on youtube!!!

http://www.youtube.com/watch?v=yfEG0mIVrNI

hope you like it.

 

Alec,

Nicely done!!!

Sounds good

Bobby