ASP 108 Engine Transition Problem

I have been tuning this engine for a week and cannot get the full throttle to idle transition just right.


It seems to holds RPM's through the mid range for a bit before it decides to drop the rpm. I had it tuned nicely with the cowl off and a 3 hose tank system.

I then installed cowl with fuel filler valve and have had problems since then. Would the filler valve be leaning out the mixture?

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by: rcdude07

Yes, the fuel filler could be causing issues. I've seen problems with these for years (20+) and therefore we've not used them in our nitro birds. I recommend try bypassing the filler on the plane and see what happens. If the engine runs fine, then you'll know it's the filler valve.

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