Engine won't start when it's Hot.

[Mart]

I'm not sure if I can help any but this a harman collins set up, right? Correct me if I am wrong, but isn't this two separate 4 cylinder ignition systems? If you had said it only runs on 4 cylinders, I could believe that one of the sides of the ignition system has failed. As it does not fire at all, we need to be looking at something that is common across both ignitions.

Are you 100% sure it is a non start due to no spark? Or could it be a typical over rich problem, or vapour lock? I'm familiar with over rich situation in 94s but have never ran a stromberg. I have not experienced vapour lock.

Next time the non start situation arises, connect one of the plug leads (or one from each side of the ignition) to a spare spark plug and see if it sparks.

I'm wracking my brains trying to think what the problem might be, but other than the above, I can't think of anything.

Mart.