Cold centre cylinder

[Trev1958]

Help! 1976 kettle. The bike started really missing and banging. Changed the plugs and all good for 100 miles. Just been out for a short ride and it went onto 2 cyls. The centre one is cold. The plug was rather oily. Put another plug in, still the same. The bike has done 5k miles since full rebuild (C. Appleby).
Any ideas???

[Alan H]

Check timing is ok first, then check plugs - what plug numbers are you using? (eg GENUINE B7ES?) The cheapo chinky knockoffs are crap btw.
All else fails, perhaps your carbs need sorting - contact Baz on here - and he will clean and set them up properly. Baz lives in Dudley, but where are you?

[Trev1958]

Hi Alan, the plugs I bought were B8ES. The carbs were completely rebuilt and very nice with no surging at all. To my shame, the one thing I have never changed are the points. Will check them and get some more plugs which the manual says are B-8ES.

[Trev1958]

Just checked the pints. A bit iffy but cleaned them. Just checked for a spark and no spark in the middle or offside cyclinders!

[Alan H]

I wouldn't recommend cleaning points as they have a very hard coating on the working faces that is scrubbed off when 'cleaned'.
Fit new and make sure the insulating washers are correct like this - http://2.bp.blogspot.com/-BnTzhC9Q8ss/T ... +point.png

[Trev1958]

Where can I get a set of points from as Robinson’s and Crooks don’t seem to have them. There are some on fleebay but they are in the USA ?

[Scotch750]

Wuh,
Ur right with B8ES, or u cud try iridium plugs (doe oil up so easy)
Or the coil ?
Condensor ?
Not that r know eff all !