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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › 50 SX-H Won't Idle Down
06-24-2014 05:15 AM  4 years agoPost 1
PilotPin

rrApprentice

Indiana -- USA

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Took my Hirobo SDX out a couple of weeks back for the first time this year. First flight the engine ran normal. When I started it the second time the idle was rough and had to keep the throttle up to keep running. Then the clutch was grabbing. Changed the glow plug at the field. No change in idle. Took it apart at home. The rear bearing was bad. Changed both bearings and took carb apart to check and clean. No change in idle. Replaced ring and sleeve. No change in idle. Checked fuel lines. Tried with another tank attached to the heli. No change in idle. Idle mixture has very little effect. I have idle mixture set very lean now. Where when it ran normal it was only slightly on the lean side. Submerged the head and back plate in water to check for air leaks. Didn't see any. I'm out of ideas. What else can I check?

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06-24-2014 06:30 PM  4 years agoPost 2
balsabasher

rrVeteran

Central Ohio, USA

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Carb barrel for wear? Carb leaking at base?

Blades; what goes around, comes around!

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06-25-2014 03:09 AM  4 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

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Then the clutch was grabbing.
Broken clutch shoe? Happened in my EVO once.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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07-09-2014 02:20 PM  3 years agoPost 4
chris6414

rrApprentice

Sneads Ferry, NC USA

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Pinch test. Set back to stock and start over.

Century Hawk Sport, OS .32, Futaba 7C, GY-601 9251
Predator Gasser SE G-23, Fut 3010 servos, JR gyro/servo

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