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HomeAircraftHelicopterMain Discussion › Viper Head Which shim do I use?
02-12-2006 08:00 PM  12 years agoPost 1
JoeHeli

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Hey Guys, need assistance I forgot.
When installing a Viper head on a YS91, Do I use "Only" the shim that cam with the viper head in place of the regular YS Shim? Or Both?
Thanks

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02-12-2006 08:13 PM  12 years agoPost 2
DOKEY

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Northamptonshire UK

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Just the one that comes with the Viper head
(0.04 is it ?)

Ryan.

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02-12-2006 08:14 PM  12 years agoPost 3
Flyinrazrback

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Fort Smith, AR

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If your using Cool Power 30% or Power Master 30%. The .004 shim that came with the Viperhead will be the only head shim you need. The YS in stock form should have just had one .008 shim under the head. If your using Magnum 30% fuel. You will most likely need the .004 shim that comes with the VH. Plus the stock .008 shim that is already with the YS for a total of .012 in shims under the head.

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02-12-2006 08:51 PM  12 years agoPost 4
u.k. sailor

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cambs uk

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no wish to hijack this thread but i am wondering a similar question, well almost. I have the big bore modded cspec with the twin plug viper head, and am having some difficulty setting it up. last time i tried to get it running it kept going backwards,. i have both the thick and the thin shims fitted that came with the head and run 30% fuel. can any body confirm that i may have decompressed the head too much?

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02-12-2006 09:53 PM  12 years agoPost 5
Flyinrazrback

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Fort Smith, AR

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uk sailor, have you seen this?

http://www.oneals.com/VHInstructions.pdf

what fuel are you running?

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02-12-2006 10:28 PM  12 years agoPost 6
u.k. sailor

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cambs uk

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I think I followed the instruction that came wit the head, but my question remains would decompressing too far help cause aan engine to run backwards, I have had this on aero engines but never a persistant problem wit a heli engine before

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