Hey guys n gals

Recently the old girl seems to be misfiring usually in high gear full load at about 4-5.5k rpm, once passed this point it clears up.

I've put new plugs in and cleaned the Perrin foam air-filter, unfortunately I'm thinking along the lines of a coil pack starting to fail.

So before I go down the route of trying to source good working packs is there anything else unusual I've not thought about?

 

gapped to 0.65mm ? or cambelt change recently ? 1/2 a tooth out cambelt can cause a missfire at these sort of rpm's , it only happened on mine when the belt was changed and the nearside pulleys weren't clamped before releasing the tensioner and they then jump 1/2 a tooth

 

Ummm. ok never thought of that but not touched the belt and its done track days with it not touched.

Nothing changed, eg plugs, belt since last major service and its done Silverstone and a day at Cadwell since, this just came on one day so I have swapped plugs after the problem occured