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Running on 3 and 4 pots, Not, 1 and 2, (FIXED)
paslow22 - January 22nd, 2023 at 12:27 PM

Help needed, Fixed

Thanks for the replies,

I also rang Nymeyer Automotive at Belmont NSW, explained the situation and was told to check the idle jets, they also explained that a backfire would not damage the motor internals. which was a major relief.

I had added another O ring to the original ones on the idle jets to make a better seal, but my thinking was wrong making and this had caused the problem.
I checked and removed 2 and 4 first that made it drivable but not perfect but heaps better

Today I checked 1 and 3 idle jets and removed the additional O rings and as yet have not started the car as I didn't want to upset the neighbours today.
I am sure it will be fine.
Many thanks to Nymeyer Automotive for their excellent advice,
I changed the plugs on a 1915 motor, without side body cut outs, (bugger of a job). twin 40mm carbs with new kits fitted, 4 new plugs

Checked the dizzy, and crossed 1 and 2 plug wires (and me thinking I knew what I was doing) anyway I fired it up than a big backfire, left it for a while and tried to restart and another backfire.

Checked all the plug wires and found 1 and 2 crossed (swore at myself for being so stupid.)
Pulled off plug wires at the dizzy for 1 and 2 and it made no difference still not working.
Tried 3 and 4 and motor slowed, conclusion they are working.

Now motor only running on 3 and 4,
Checked fuel spray on 1 and 2 and working.
Pulled out N0.2 plug and tested with the lead to No.2 on dizzy and it was sparking, didn't try No.1

Haven't pulled off rocker cover yet or a pressure test on 1 and 2, have to get a gauge tomorrow.

Any idea what has happened.

I think I may have damaged something internal, (I hope not)

Thanks in advance any feedback will be greatly accepted and appreciated

hellbugged - January 23rd, 2023 at 04:25 AM

Does it go ok away from idle?

Carb sync or blocked idle jets

grumble - January 23rd, 2023 at 06:33 AM

Originally posted by hellbugged
Does it go ok away from idle?

Carb sync or blocked idle jets

Have you checked in the distributor cap? Another possibility if it runs a balance tube between the manifolds, it may have blown off or the manifold or carburettor base gaskets blew out--- loose inlet manifold is another possibility.

vw54 - January 23rd, 2023 at 04:27 PM

Check you havent dropped a push rod off

lots of things to check