Weber 28/36 running too rich

[johnn1493]

Hi everyone
First post from me. I’ve a Series 2 with a stock 1470cc engine which is taking its first few runs after years off road. Over the last two years I have swapped the chassis and renewed most of the suspension etc. The engine received new liners from the previous owner and so I haven’t really touched that side other than changing fluids. All new fuel tank and lines and an electric fuel pump with regulator.
Starts reasonably well but black sooty exhaust. Plugs fouling up very quickly.
The 28/36 Weber looks relatively new. I’ve stripped and cleaned reset float height. Checked ignition timing, replaced plugs and coil.

All jet sizes are as per ford cortina 1500 settings in book.

Put all back but still running rich with sooty black smoke exhaust. Turning the idle adjustment screw seems not to make any difference.

Haven’t checked valve clearances yet or given it a compression test.

Any ideas would be gratefully received.
Thanks
John

[4129R]

Does the Weber have an air filter?

Dirty air filter will restrict oxygen and make the engine run richer.

If the mixture is rich, they start easier, but run too rich when hot.

[BDA]

  johnn1493!!

Wish I could help you with your carb.

I know we’d all love to see pictures of your baby!

[jbcollier]

“Electric fuel pump with a regulator”

High fuel pressures cause the fuel to “squirt” and create turbulence in the float bowl.  This messes with the jetting.  Fit a proper low-pressure fuel pump that does not require a regulator.

While waiting for the pump, check your valve clearances.

If you search the forum there are posts with recommended 28/36 jet settings.

[Clifton]

Without a wideband you won't know where it is rich.
https://www.youtube.com/watch?v=MMTC6u0Nmk4