flat spot on 2f

[PATROLSNIFFER]

hi all was hoping for some advice.my 2f has a flat spot at about 1300rpm.it is very bad when cold and not so bad once warmed up.unfortunately it happens just as you enter the intersection etc and while i am aware and an cope with it the girlfriend stalls it and shits herself lol

[tassie40]

Sounds like carbie troubles.... could be due for a rebuild

[matt73]

Might have to look at plunger.

[dumbdunce]

there are a lot of things that can cause flat spots on that motor. manifold cracks or leaks at the head - spray wd40 around where the inlet manifold bolts to the head to see if the revs change - indicates leaks.

vacuum hose leaks - if it's from the early '80s it will have a million emission control hoses, if any of them leak you will havbe a lean condition which can cause a flat spot.

EGR not functioning properly

carby accellerator pump jammed/worn

carby throttle shaft bores worn

I reckon you have a vacuum leak somewhere - either a crack or warpage of the manifold, or a broken hose somewhere.

[J Top]

Also check your thermostat, especially if you are running headers.
J Top