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HELP Simonini Mini 2 OVERHEATING OR NOT??


smaszczak
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I have a simonini mini 2 motor with bing 84 carb that starts / runs great. Probably has about 40hrs on it. My only problem is after i have been flying for about 25-45 minutes when i land and my motor goes down to its normal idle my kill switch doesn't work and it takes what seems to be about 20-30 seconds before the motor shuts down. I have changed out my kill switch button thinking this was the problem but still have the problem. I have tested my kill switch while flying and the motor does react to shut down while i have some throttle on in the air. The problem seems to be after a period of flying, after i just land and motor drops to normal idle (it doesn't shut down for about 20-30 seconds). It seems as if i am pushing the kill button and nothing happens until this period of time... I have no problems shutting it down any other time. I use Amsoil for my oil at 36:1 mix ratio, my spark plug shows normal coloration on it and i have cleaned my carb. I don't know if this is an overheating problem or electrical problem. If anyone could help or has experienced a similar issue it would be greatly appreciated.

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Sounds a bit like your motor is suffering from something known as pre-ignition. Engine gets hot and glowing carbon deposits inside the compression chamber ignite the fuel mixture. Caused by poorly timed ignition and or mixture settings I think. That's a fairly rich oil mixture too. Could be where the carbon is coming from. Does it smoke much ?

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It doesnt smoke anything out of the normal and i also pulled my exhaust off and peeked at the piston from the exhaust port. There is carbon but it appears to be normal from my opinion, but then again i am not a mechanic... What oil mixture should this be running on 32:1?

Also i only have about 30 hours on the motor. When you say de-coked it, i assume you mean pulled the cylinder head off and cleaned the carbon off? that has never been done.

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Pete_B - i havent changed out my spark plug which is one thing i intend to do . The problem is it runs great with exception to my problem. But i will do this.

Dariuszk24 - This is good to know, but i dont have a tachometer on my unit. I am considering purchasing a cylinder head temp gauge to see if my unti is really running hot or not...

I appreciate all of your feed back.

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