runs better with choke out

[pseudotsuga]

I've adjusted carb (Rochester 2Jet on a pretty stock F) to have greatest vacuum (w/ vac advance disconnected), timed, valves newly adjusted, dwell (almost) perfect (any big reason not to get Pertronix, a little tired of points - I've read some old threads on this...), idling at 650rpm, but when all is said and done and we're up to operation operating temp and I've pushed the choke back in and I'm heading down the road... if I pull the choke out a bit I get more power. I assume this is a lean/rich issue but can't quiet make that pan out, ie; I assume it's something simple but I'm stumped!

 

[burnttoastburgos]

start with vaccuum leaks around the base of carb and all vaccuum lines. Check by carefully spraying starting fluid "LIGHTLY" around all vaccuum ports and base gasket, if no rise in rpm, replace your accelerator pump diaphragm, very cheap fix, 15 bux tops. Most lightly a heavy vaccuum leak.

 

[middlecalf]

x2 on burnttoast's suggestions. What altitude you at and what altitude is the carb setup for? How old's the gas?

"idling at 650rpm, but when all is said and done and we're up to operation operating temp and I've pushed the choke back in and I'm heading down the road..."

Wait a minute, what's the idle at after pushing in the choke? The idle with the choke pulled should be a lot higher than 650.

 

[FJforty]

Pull a few plugs and lets find out if you are burning the fuel correctly. This could be a float level issue.

 

[pseudotsuga]

thx everybody - will check all when I have a minute. yeah 650 with choke back in. at sea level.

 

[huntsman522]

runs better with choke

i have a 72 fj40 with a 2f and a 2 brrl webber carb and my rigs doing the same thing. i figured out that its my accelerator pump. i tried to find 1 but nobody has them and say they cant get them, so i have to change my carb. unless some1 can let me know where to get 1. that would b greatly appreciated

 

[FJforty]

The accelerator pump would be the problem if you werel accelerating when the choke was used. If the problem is during a cruise then float level.

 

[DSRTRDR]

have you tried to advance the timing ?

valve adjustment correct ?