HELP serious rich running problem

[Pops]

All good stuff thanks everyone

As it happens I've got a suitable Spring balance for checking the pull off Strength of the magnets

Some of the things listed have been checked some haven't. Distance is proving a problem so if not sorted in the morning I will derig and bring back to home airfield in any case so I can work on it properly

Didn't occur to me - or my engineer - that fuel pump Spring going week could cause increase pressure spikes

Anyway - it will be a lot easier to sort once at home

[Garyo]

I think the heads are going to have to come off

[Pops]

Which is not a big deal but what are you suspecting?

[Garyo]

Valve seat moving when warmed up

[pilottrev]

When I had rough running engine problems we went through all of the scenarios as people have suggested and more, it turned out to be deposits on the contacts inside the dizzy caps, once cleaned off with the blade of a pen knife the engine ran sweet as a nut, worth a try,