I was wondering if anyone familiar with this plane has had this issue? I could not get the engine to advance to full throttle, after jacking with it all day, I noticed that everytime i advanced the throttle, the low speed needle valve would catch on the cowling and close. i made the opening bigger with my dremmel to give it clearence, and now I have no issues. I was wondering if this was a normal problem with this plane? If so it seems like a major design flaw?

i had to do the same, so did another person i know, so yea, it's normal along with you'll have to pull the pin on the high needle side after a few runs to richen it up

The only problem is those d-a-m-n blue restrictor collars.

BTW: Pulling the pin out alone is not sufficient to eliminate their effect. They still restrict closing the needle valve even with the pin removed, because the needle valve moves "in" as you turn it, and the restrictor prevents that.

jsngnn22: be aware that as the engine warms up the HS and LS needles tends to "walk" or turn by themselves.

We've resorted to putting a grommet, fuel tubing or a small segment of exhaust tubing around the needle to push the clip against the detents and hold your settings firmly in place.

I hadn't even thought about that, thanks, I'll do that tonight.

thanks opjose, i went brain dead and couldn't remember what thosw stupid things were called