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AlignRC Thunder Power RC
Gazza

Heliman

Australia

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Hi guys
Have a spectra G with a TRM 231 with a hex starter , as I start the model I need to hold on to the head tight as it revs up before settling down to an idle , why would it do this and what can I do to fix it ....?

Cheers

Gary...

Melbourne Victoria

09-28-2016 08:34 AM
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RM3

Elite Veteran

Killeen, Texas - USA

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your ratio of the carb butterfly opening (throttle position) to your needle settings have alot to do with that.

if the engine provides plenty of power during flight and no other issues....

I used to have the same problem.... engine would start up and engage the clutch for about 3 - 5 seconds then would settle down.

depending on the carb, you will need to readjust the low and high needle accordingly along with the throttle position... your carb must also be able to kill the engine when it closes. an engine that sputters and then dies instead of quickly stopping when the throttle is fully closed is a good indicator of this.

showing a preference will only get you into trouble, 90% of everything is crap...

09-28-2016 01:40 PM
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Gazza

Heliman

Australia

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Gassers

Thanks for the reply RM3 , I did what You suggested and it worked , now I have the throttle rise when at a hover , I lift the model up into a hover and seems ok then rpm will rise to a fast pace , would this be high needle settings doing this ? or servo moving from engine interference , have a close to linear throttle curve , other than this all I can think of is air leak at isolating block of carby...

Cheers

Gary...

Melbourne Victoria

10-03-2016 08:35 AM
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mcfast

Key Veteran

Quebec Quebec Canada

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It is normal when you first start your motor it runs a little fast, because the motor is cold and the fuel to air ratio is on the lean side and causes a fast idle, but once the motor warms up the idle starts to settle, it only takes a short time to start warming up, like 15 to 30sec.

P.S. sorry for the spelling or the grammar I am dyslexic!

10-03-2016 03:44 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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whats your setup? are you running a governor?

if you are, consider disabling the gov until your curves are set and the carb is tuned and you can fly around comfortably.... sounds like the gov is coming online and engaging. otherwise if this rise in RPMs is not predicable then a leak is likely the cause. The carburetor isolation block is the first place to check. after that the sealed bearings, then the cylinder/crankcase gasket, then the muffler gasket (yes this has a marked effect too)

as Mcfast stated, the engine when cold will idle a little fast... but it should settle down rather quickly... its should however not startup fast to the point that it engages the clutch enough that you have to hold the head from spinning til it settles down.

if you can post a video, that would help us help you a little better.

showing a preference will only get you into trouble, 90% of everything is crap...

10-03-2016 04:55 PM
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