Topic: Hotter running spark plugs for cb550 f2 1977

[Paul P.]

Hi my bike is runing to rich and I would like to try and run a hotter plug to see if it makes a diffrence
I am using   NGK DR7ES could any one tell me the number  of a plug that would run hotter
it does not mater what make and may be you could let me know of a supplier I am in the UK MIDDX .

[TwoTired]

Your spark will be hotter if you simply change to non-resistor plugs.

With NGK plugs, the lower the number the Hotter the heat range.  Try to get them without the R in the number.

D7EA (or S) is correct for your bike.
D6EA would be hotter heat range.  This would suck less heat out of the combustion area.

Cheers,