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HomeAircraftHelicopterMain Discussion › Viper Head/YS91/MP2/8.45
02-08-2006 11:14 PM  12 years agoPost 1
bkervaski

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Birmingham, AL, USA

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Hi all.

I am having a heck of a time getting my YS91/MP2 combo tuned. It's very flyable, tons of power, but tail twitches from time to time. Even had a local expert working with me (Don Wade). On his recommendation, I ordered a ViperHead. I have another YS with a Hatori pipe, runs smooth as silk.

Was looking for opinions on a ViperHead/8.45/MP2/YS91 combo ...

Thanks for any input!

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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02-09-2006 01:09 PM  12 years agoPost 2
jbiter

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Sebring, FL

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I don't have any experience with MP2 setups on 91 size machines but I can say the 50 size MP2 really wants a single speed setup. What head speed are you trying to run?

Jeff

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02-09-2006 07:43 PM  12 years agoPost 3
BlakeMcBrayer

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Georgetown, Ky

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What type of fuel are you running. I had this same issue on both of my YS91's. At the time I was running Wildcat HeliMix 30% with HV oil. I switched to WC's Youngblood mix which has a LV oil in it and it cured my kick issue. This kikck only showed up at lower outside temps as well.

I don't think the YS likes to properly meter the thicker oils through the regulator at lower temps. Beside the YS manual calls for a LV fuel anyway.

HV = High viscosity (thicker)
LV = Low viscosity (thinner)

.

Don't come off the throttle untill you see your GOD!

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02-09-2006 09:10 PM  12 years agoPost 4
Havoc

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Ky.

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Do whatever Mr. Wade says.

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02-09-2006 10:05 PM  12 years agoPost 5
bkervaski

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Birmingham, AL, USA

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I'm flying powermaster 30. It's the only fuel I've ever flown. Don is a rep so if I use another fuel he'll most likely flatten my tires and bring a freq scrambler to the field when I fly.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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