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Old Sep 25, 2012, 10:48 PM
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arik434's Avatar
United States, NY, Buffalo
Joined Aug 2012
520 Posts
OS 46 FX Engine Tuning Problems

I am new to glo engine planes and picked up a Nexstar from a co worker who never even flew it. It has been flow before he purchased it. I can get it to start up and seem to have gotten the high speed throttle tuned in. I dont have a tachometer, but it sounds great. I can bring it back to idle and seems ok, but if I 'blip' the throttle real quick, it does seem to stumble. It will eventually clear out and get up to speed. I am running brand new 10% fuel and a brand new #8 glo plug. The manual says the start point for the mixture screw is 1.5 turns out. To me, it seems like this is a rich bog and I try to lean out the mixture screw, but that doesnt really seem to do a whole lot. Then I tried to go the other way and again, didnt seem to make too much of a difference. Also, the manual said that I should see 'smoke' coming out of the exhaust. I really dont see much smoke, but do get quite a bit of wet fuel coming out of the exhaust. Is that normal ?

Scratching my head here...any suggestions?
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Old Sep 26, 2012, 01:04 AM
Registered User
United States, OR, Canby
Joined Aug 2011
2,525 Posts
It sounds rich, if it were too lean it would die when you advance the throttle. Let it idle for a minute, if it slows down the low end mixture is too rich. If the fuel is synthetic oil you might not see much smoke, I don't really notice smoke until it's in the air.
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Old Sep 26, 2012, 08:11 AM
use the 4s luke, use the 4s...
scrub monkey's Avatar
Australia, QLD, Booyal
Joined Sep 2012
864 Posts
Turn the low end (the screw inside of the throttle arm) in 1/8 of a turn at a time until you can snap the throttle up after a minute or so of slow idle. Once you get that hit the high speed. So full throttle turn it till it starts to slow, deeper sounding etc then back 1/4 of a turn. (1/8 would probably do but 1/4 will give you some room since you are new to it) you will soon pick up the sound of when it reaches peak. I didnt think so but after about a half dozen times i picked it up.
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Old Sep 29, 2012, 10:05 AM
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United States, Mt, Bozeman
Joined Jan 2012
348 Posts
Definitely the low speed needle (assuming the high is set correct). It is a pain to get at, but you will notice that the raw fuel being spit out will decrease a ton when you lean that baby out.

You should be seeing a little smoke on the top end, which means you will be running a little on the rich side for the high speed.
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