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HelicopterEngines Plugs Mufflers Fuel › ''Fuel for a 4-stroke engine, size 91''
04-25-2002 11:19 AM  15 years agoPost 1
Mick Hoey

rrNovice

Denmark

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I have a YS91 AC 4-stroke engine in my XL-Pro heli, anyone have experience with any fuel for this type? Now I'm using Cool Power with 30% Nitro and I think it's 23% oil, but I'm not happy about the amount of smoke it develops. How low can you go on oil mix in the fuel for the four-stroke, 20 or 17% or lower?

Have just ordered CP fuel with 25% Nitro, and 20% oil!

Anyone have experience with other fuelbrands? such as Wild-Cat

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04-25-2002 12:18 PM  15 years agoPost 2
ed vega

rrKey Veteran

nyc, queens

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can't say which brand is better but I also have the ys91ac and it like a lower nitro content below 20% .

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HelicopterEngines Plugs Mufflers Fuel › ''Fuel for a 4-stroke engine, size 91''
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