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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Crankshaft/back plate YS SR91
04-25-2009 05:01 AM  9 years agoPost 1
Tommy8275

rrVeteran

Mount Juliet, TN

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Does anyone know that YS St91 crankshaft and back plate will fit on YR SR91? I'm looking for a crankshaft and back plate to replace my old YS SR91 that has been damaged

Tommy K

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04-25-2009 05:03 AM  9 years agoPost 2
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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I dont want to say for sure
You might want to check with Richard at http://www.yspartsandservice.com/

or look at the manual and part numbers

AMA 334000

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04-25-2009 05:04 AM  9 years agoPost 3
george0079

rrElite Veteran

USA

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Not sure about the back plate... But the crank will work. Unfortunately, using the ST crank reduces the displacement of the SR, due to the stroke difference between the two engines.

It will turn your 91SR into something like an 81...

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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04-25-2009 04:30 PM  9 years agoPost 4
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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If you install a shorter stroke crank, won't the transfer ports not fully open, and the deck height will be considerably bigger? How can this work?

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