Zenoah G26 Surging - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-11-2012, 08:38 AM   #1
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Zenoah G26 Surging

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I have a 5 yr old Zenoah G26 that since new has had an annoying surging right around the throttle setting I use for low cruise and landing approaches. This is in a H9 SuperCub so low cruise isn't a whole lot above a fast idle. Idle and full throttle run beautiful.
I have tried all sorts of different needle combinations but just can't get rid of this surge.
Throttle linkage is tight. Any ideas?
Thanks -Rob-
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Old 09-21-2012, 09:26 AM   #2
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Elec Re: Zenoah G26 Surging

Have you vented the carb? Sometimes the shape of the cowl combined with a certain airspeed or attitude will result in pressure differences inside the cowling that mess with the s diaphragm. Because of this I vent all of my gas engines. There are many threads on how to do this but the basic idea is to solder a small nipple to the diaphragm cover plate and then run a length of tubing from the nipple on the carb back into the fuselage (into an area where the air pressure will remain relatively constant).
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