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Exhaust residue.....

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Old 09-14-2012, 02:50 AM
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BobV1700
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Default Exhaust residue.....

I have a 35cc MVVS gas engine that's only had about 4 hrs running in total and is still slighlty rich. I'm using a 1:40 oil/petrol ratio and the engine appears to be running well but the exhaust residue is thick, black, and has a sticky consistency. I am I right in assuming the residue is caused by the slightly rich settings still? The plug is a nice 'sand' color with no significant oily coloration and I'm using a high quality spec 2stroke oil.


Thanks Bob V
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Old 08-15-2015, 09:14 PM
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Sounds correct...I am running in an engine on 20:1 in the plane. I have spots of black all over the bottom. At 32:1 it's not bad at all.
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