Zenoah G23 won't run past half throttle!

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chriswhipple34 · 11-07-2009, 07:20 PM

I just picked up a G-23 and can't get it run past half

throttle. It runs great on the bottom end and mid range. Dies if you open up to full throttle from either mid range or idle.

Help!

MODE 1 · 11-07-2009, 07:49 PM

OK so what tests have you carried out thus far?

FuntanaS · 11-07-2009, 07:58 PM

At one point did it run good on the same setup?
The fuel clunk could be too small and not allowing enough fuel to flow.
Try opening the carburator and look for debris on the filter screen. This could be blocking fuel.

You need to remove this screw (below) to get to the fuel fliter.

rcign · 11-08-2009, 01:38 AM

Most problems like this are the throttle opening the wrong way...close the throttle and look in the carb..If you can see the head of the screw holding the throttle plate the carb is opening wrong...Take the arm off the shaft and put it back on so the threads of the screw are showing with the throttle closed.....
Check to see that the pulse holes from the cylinder through the insulator line up with the hole in the carb..
Check for air leaks under the carb...
Open both high and low needles 2 turns from closed, set the high first...

chriswhipple34 · 11-08-2009, 10:33 AM

Great. Both were way off. Got her screaming on the top end and richened her up a little from there.

Next problem is with the servo travel. There is such a short throw on the motor arm that half throttle is already wide open. Can you adjust end points on a Futaba T8UHPS or how would you fix this?

rcign · 11-08-2009, 11:26 AM

Shorter on the servo, longer on the carb.

chriswhipple34 · 11-08-2009, 02:00 PM

That worked too!

MODE 1 · 11-08-2009, 02:21 PM

If you have a good Tx you can improve it even more with a throttle curve

Chuck Vanderwege · 03-28-2010, 05:58 PM

	Quote: Originally Posted by chriswhipple34
	I just picked up a G-23 and can't get it run past half throttle. It runs great on the bottom end and mid range. Dies if you open up to full throttle from either mid range or idle. Help!

Different guy, same problem G-23. Read your suggestions. Checked fuel clunk. Was not sure mine was too small so took off completely to test making sure line was in gas inside tank. Opened carburator and looked for debris on the filter screen. No Debris. Hope I got it back in right side up?
Looked in throttle, saw small screw. Took carburator off, much larger screw on opposite side facing engine. Put back. Fired right up. Still won't run past half throttle???

barchiolaNJ · 03-28-2010, 08:53 PM

nevermind

11-07-2009, 07:20 PM	#1
chriswhipple34 Flyin' Around Join Date: Oct 2009 Posts: 13	Zenoah G23 won't run past half throttle! I just picked up a G-23 and can't get it run past half throttle. It runs great on the bottom end and mid range. Dies if you open up to full throttle from either mid range or idle. Help!

11-07-2009, 07:49 PM	#2
MODE 1 Has moved on Join Date: Jul 2008 Posts: 4,153	Re: Zenoah G23 won't run past half throttle! OK so what tests have you carried out thus far?

11-07-2009, 07:58 PM	#3
FuntanaS Flyin' Around Join Date: Nov 2009 Posts: 1	Re: Zenoah G23 won't run past half throttle! At one point did it run good on the same setup? The fuel clunk could be too small and not allowing enough fuel to flow. Try opening the carburator and look for debris on the filter screen. This could be blocking fuel. You need to remove this screw (below) to get to the fuel fliter. Attached Thumbnails 52.0 KB · Views: 28

11-08-2009, 01:38 AM	#4
rcign Bad-ass Super Contributer! Join Date: Jan 2006 Location: Williams, Az USA Age: 76 Posts: 2,439	Re: Zenoah G23 won't run past half throttle! Most problems like this are the throttle opening the wrong way...close the throttle and look in the carb..If you can see the head of the screw holding the throttle plate the carb is opening wrong...Take the arm off the shaft and put it back on so the threads of the screw are showing with the throttle closed..... Check to see that the pulse holes from the cylinder through the insulator line up with the hole in the carb.. Check for air leaks under the carb... Open both high and low needles 2 turns from closed, set the high first... __________________ It will either work or it won't

11-08-2009, 10:33 AM	#5
chriswhipple34 Flyin' Around Join Date: Oct 2009 Posts: 13	Re: Zenoah G23 won't run past half throttle! Great. Both were way off. Got her screaming on the top end and richened her up a little from there. Next problem is with the servo travel. There is such a short throw on the motor arm that half throttle is already wide open. Can you adjust end points on a Futaba T8UHPS or how would you fix this?

11-08-2009, 11:26 AM	#6
rcign Bad-ass Super Contributer! Join Date: Jan 2006 Location: Williams, Az USA Age: 76 Posts: 2,439	Re: Zenoah G23 won't run past half throttle! Shorter on the servo, longer on the carb. __________________ It will either work or it won't

11-08-2009, 02:00 PM	#7
chriswhipple34 Flyin' Around Join Date: Oct 2009 Posts: 13	Re: Zenoah G23 won't run past half throttle! That worked too!

11-08-2009, 02:21 PM	#8
MODE 1 Has moved on Join Date: Jul 2008 Posts: 4,153	Re: Zenoah G23 won't run past half throttle! If you have a good Tx you can improve it even more with a throttle curve

03-28-2010, 08:53 PM	#10
barchiolaNJ build, fly Join Date: Feb 2010 Posts: 280	Re: Zenoah G23 won't run past half throttle! nevermind Last edited by barchiolaNJ; 09-09-2010 at 01:38 PM.

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