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YS 115S crank replace

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Old 09-25-2019, 01:29 PM
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Dan.H
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Default YS 115S crank replace

Should I use a Warbird Special crankshaft in a standard 115-S? Will that WS crank work with the stock S piston and rod?
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Old 09-26-2019, 06:46 PM
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speedracerntrixie
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It would be best to direct that question to Richard Verano at YS parts and service. There are two possible differences, the crank seal ring and the counterbalance.
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Old 09-26-2019, 09:45 PM
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Dan.H
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Thx Speed, Ill give him a ring.
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Old 10-06-2019, 02:24 PM
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Dan,

Flying standard 115s, 3 times had digital aileron servos fail on me, in-flight during race heats, on two different Fw 190D-9 Warbird racers. I was experiencing too much vibration out toward the tips of the wings. Since Richard installed the counter-balanced crankshafts into my three 115s, I have not had the same issues. It is not cheap to have them replaced; but for me, the cost beats not being comfortable to use the engine without risking the entire airframe due to resulting structural or equipment failures -- especially in competition.

Ollie
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Old 10-06-2019, 05:29 PM
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Dan.H
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Hey Thanks Ollie, did you use the standard 115s piston if I may ask? Thanks! Im getting good results with the 14x12N you suggested.

Last edited by Dan.H; 10-06-2019 at 09:55 PM.
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Old 10-14-2019, 09:02 AM
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Jimmy Skids
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Most are using the warbird special piston. It lowers the compression a bit, but the end result is a smoother running motor that can take a bit more nitro if needed. Shoot for a 9500-10500 RPM range on fuel prop combinations.
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Old 10-14-2019, 09:59 AM
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Dan.H
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Thank you there Jimmy!
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