Topic: 30% loss of power, any ideas?

[Deltarider]

I'd start with looking after your plugcaps and -wires. With 30% loss of power, most likely the problem is there. At least that's my idea. When caps and wires age, they become dirty. In rain deposits like salts will become conductive. When the weather is dry - hey, a miracle! - the problem is gone. Not so. If you keep the same plugcaps and -wires, bring a can of WD-40 when expecting rain.