carb difficulty, could someone help please

cosbytnkid · #1 (**permalink**) 03-03-2007, 12:30 PM

Hi Buzzmobile,
I was just wondering how you came out with getting your engine to settle down at lower RPM's? There was a lot of good information out there and I'm just curious to see if anything help resolve your problems.

Buzzmobile · #2 (**permalink**) 03-03-2007, 12:48 PM

just after the time writing that stuff, the weather turned cooler, so have yet to really check it out. I can say that I did spray a little carb cleaner on the advance mech of the distr and it seemed to help. The one thing I noticed, it still does it when it is not FULLY warmed up....but when the oil and the water temp are all the way warmed up, this behavior stops. does that help with any clues?

Buzz

Dominik · #3 (**permalink**) 03-03-2007, 12:49 PM

good morning,

I had similar hickups with a wild cam and the power valve intermittantly open causing the mixture to run rich at idle.
It might even be a blown power valve, but the mechanical advance would be my first bet.

Do you also run vacuum advance?

Dominik

cosbytnkid · #4 (**permalink**) 03-03-2007, 01:34 PM

Good point Dominik, I never considered the power valve going out. Although from what buzzmobile is describing, now that his mech. advance is freed up, I tend to think his choke butterfly might be hanging a little bit. Until engine is fully warmed up if choke is still on it too will cause an over rich mixture at low RPM. I'm assuming it's heat operated and not an electric choke. I would loosen the screws on the black housing where the bi metalic spring is. Keep in mind the engine is cool or at least room temperature, then I would turn the housing to where the choke butterfly would just barely close. Then I would manually open the choke to full open, crack the throttle open a little bit to see what the choke would do. If it closed (lightly) then I went ahead and tightened up the choke housing screws. If it closed shut tight, then I went back and turned the choke housing to open a little more. This was a trial by error process but I never had any problems with the automatic choke. The choke came on when the engine was cold but as it gradually warmed up the bi metalic spring relaxed allowing the choke butterfly to open up right away. So buzzmobile the next thing I'd look into is your choke and see what it's doing. If it operates OK then yes I'd think about replacing the power valve. Double check your fuel level make sure it is at bottom of sight plug hole on side of fuel bowl also.