Spark Plug

[Guest trigger]

Can anyone help!!! :gdit:

 

I'm running a 2,1 with twin 45's, Aldon non-vacum distributor Bosch power coil.

 

The problem is that No4 spark plug keeps fouling up with what looks like carbon?

 

This is driving me nuts as i've tried everything I can think of :boohoo:

 

Any help will be greatly received!!!!

[Big Jim]

Are your carbs set up correctly? or have you just put them on? it sounds like over fuelling on No 4.

[Guest paul mercer]

surely if the carbs were set up wrong, the problem would be on all cylinders? If there was no spark you'd just get a wet plug but maybe the plug is giving a bad spark. Could be lead or plug. Maybe swap them round and see if the problem stays or moves.

[Big Jim]

surely if the carbs were set up wrong, the problem would be on all cylinders

Not necessarily, the idle screw on No 4 cylinder could be too rich, in fact it could even have a wrong jet in, that's why i ask if they've only just gone on, or have been OK before.

Could be lead or plug. Maybe swap them round and see if the problem stays or moves.

It could be, but it's seems like it's firing, as he says "carbon-like deposit"

Anyway, there's a few things to check.