Fuel Additives

[Steve Jones]

That's what I meant in my post above, Mark. It's fine looking at all the complicated and obscure issues but if the mixture's weak, the float level is too low and/or the ignition is retarded you're wasting your time. Get the basics right first before thinking about the more obscure. My experience of updraught Zeniths is that a mixture that is slightly over rich and a slightly increased tickover speed makes a significant difference.

Steve