Hi Doug,
I know you think a Koel engine may have a lot better quality but don't count on it.... I'll bet a lot f the parts in your gus could be found in a Koel...some friends work at a local machine shop dedicated to natural gas compressors / engines... a lot of the Cummins NG stuff comes from india... now you would thing Cummins would be Cummins quality no matter where it's made... well they told me horror stories about the indian cummins engines... poor fit, rough castings, dirt... yes dirt... in a cummins... Petteroid and listeroids may be the bottom of the barrel... since more folks can make them... but I have to think the real problems.... or should I say challenges come from the indian culture of "that's good enough for what it will be doing"...
Maybe Koel would be interested if you were ordering 50 engines... but for a one engine sale I think these folks have bigger fish to fry..