I guess my response here is to ask another question. I noted in one of the replies that it matters somewhat (idle bar vs. no idle bar) with inverted applications. Here goes my two pointed question. 1. I have an Evolution 100 that I am installing in a new (building process as we talk) Excelleron 90. This is installed inverted. Ok. One of my friends has a Quest 90 with the same engine and he is having a hell of a time getting the engine to run properly, at times even getting it to start.

Is running the engine inverted and his starting problems related? (are there some peculiar issues with running an engine inverted? my first experience is with my Venus 40 with an OS 50 (see below). Am I going to run into a problem with the Evo 100 inverted?

How about running it with an idle bar plug? Will that help with the running issues he ran into? (Keep in mind that I have not completed the Excelleron 90 build although I have run a couple of tanks through the engine, but upright on a test stand).

I also have a Venus 40 with an OS 50 inverted. I have to use a set of pincers to close off the fuel line to keep fuel from running into the engine until I start it. So far, though, the OS 50 has run just fine inverted, but that's not to say that I won't have a simlar problem with th Evolution 100.

Thanks.

DS.

Quick edit here.. I am using S&W Hi-Rev 15% fuel with 20% synthetic oil.