Sean, I hope this issues are not concern with the by passing the prop selonid. Some of us when start having problems at the start up just diconect the prop line and jut insert the propane without using the selenoid. If by any reason we have to do this, wich is NOT recomended by the manuf. we still need to use the filter and restrictor, even if we use the regulator cap valve in the coleman bottle. Also important is that we need a one way valve to not causing any pressure difference between the air and propane while starting. This difference in pressures can cause a backdraft causing a reverse flame that can burn the festo conectors and lines inside the cowling. I'm no expert but this is what Juan Ramon told me at the phone last time I was having issues with the gas lines in my eagle. With the new bigger restrictor most of the problems at the starts had been solved. It's a shame that you are having problems with all 4 engines at the same time. [:@] I'm sure that Felipe and gang will take care of you. These engines are more delicate than the other brand we are using. There is not doubt that they are solid, reliable and fast. But care have to be taken with them. I'm very very happy with my engine and the support and service of the factory. Let us know what Juan find in your engines so we can continue taking care of ours. The artes family is growing very fast. Wow, now we have two big good familes. The other one don't have to be mention here. You guys know her very well. Sorry if I still mispeling, you know my english is not the best.

Rgs
Alejandro