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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Viper head for YS 91
11-23-2006 10:59 PM  11 years agoPost 1
pepenk

rrApprentice

Jakarta, Indonesia

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I just got Viper head for YS. What I want to know which head shim should be use for optimal running of the engine. Fuel is CP 30% and for F3C flying.
Any suggestion will be much appreciated.

Thanks and regards,
Ferri
INA 0083

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11-23-2006 11:01 PM  11 years agoPost 2
RobRoy

rrKey Veteran

Huntsville, Alabama

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According to what I've been told, and am running myself, just use the .004" shim that came with the viper head.

Ignorance is curable, stupidity is for life.

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11-25-2006 11:35 PM  11 years agoPost 3
pepenk

rrApprentice

Jakarta, Indonesia

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So the original shim from YS is not used?
Thank you very much for your suggestion.

Thanks and regards,
Ferri
INA 0083

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11-25-2006 11:39 PM  11 years agoPost 4
RobRoy

rrKey Veteran

Huntsville, Alabama

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No, the original shim from YS is not used with the viper head.

Ignorance is curable, stupidity is for life.

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02-11-2007 02:19 PM  11 years agoPost 5
Roland

rrNovice

UK

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What shim is best when using 20% cool power .008 or .004??

all the best ro

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02-16-2007 04:17 PM  11 years agoPost 6
Dusty

rrApprentice

Edmonton, Alberta - Canada

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I just pulled my engine apart to replace the bearings and check things over... I've left the shim out completely... seems to be working better actually... I guess it depends on more than fuel. Altitude for one thing would be a factor.

Canada Shawn

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