Thread: Hi, my first post, with 2.25 carbie problem

Welcome to the forum, you would be better off putting this Post in the Series III forum or the Tech Chatter found in the main page, good luck, Regards Frank.

Hi, I've recently bought a "76 series 3 with 2.25 engine. It wouldn't idle properly and the mixture screw was buggered so I bought a new carbie. I also did all the usuall things for a tune up - tappets, plugs, dizzy cap and leads, and fitted an electronic pick up to replace the points and condenser. I also blanked off the air intake under the carbie flange where the crankcase gas thing was mounted. The engine now idles very wel, but when I try to rev it out while driving it the engine sort of "chokes" at high revs and won't give enough power. When I pull out the choke as it is gasping it suddenly picks up and revs out as it should, indicating I think - running lean. I have sprayed water around the carbie joints and inlet manifold to check for sucking air while revving it but did not detect any change in engine note. I dismantled the new carbie to check for blockages and also lapped the joints in carbie body before reassembling. Still the same. Only the main jet in the new carbie had a number on it and it is the right one. None of the other jets have sizes on them.
I'm also not sure about checking the timing with electronis ingnition as I can't check for points opening at TDC (it's 8:1 compression). I put a strobe light on it at the lowest revs possible and set it to TDC. It seeemed a bit gutless so I advanced the timing a bit by guesswork and it seemed to help - with no knocking.
Any advice on these matters would be greatly appreciated, especially the lean mixture problem.
Cheers,

Vacuum advance is what comes to mind. Two questions -

1. Is there a vacuum leak in the vacuum advance piping or diaphragm? Any leak here will show the same as a manifold leak.

2. When you set the timing, did you disable the vacuum advance? I would set the timing static, using a light in the low tension circuit. In any case, best results will come from advancing the timing until it pings under load and then backing it off a couple of degrees.

It is just possible that you have been sold a carburetter with the wrong jets. I don't have the correct sizes to hand, but for a start, which carburetter is it?

John

Welcome to the forum, as above, you'll get more help in the technical specific forums.

Welcome to you


I see you followed the advice hope you sort it soon

great little trucks aren't they

Mrs hh