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Ouch, think it may be time for a new gen head and go brushless. Unfortunately its not usually a simple swap because often the brushless heads are larger and it takes some fabrication work to make the change. Is it a Perkins 4.108 engine? You are getting some of the most solid advice I am sure from Gordon. I can recommend highly Central Georgia Generator if you are anywhere near there. Their gen heads are affordable and the best part is they have great customer support and tech support. 

We have a Wanderlodge member that put a 3 phase head on his 4.108 and he uses all three phases to run three different chargers to quickly charge up his battery bank, he has a custom built battery bank made from a chevy volt battery.