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YS110FZ lost some power

Old 05-01-2008, 07:28 AM
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Default YS110FZ lost some power


I have a YS110 motor pulling a Venus 2 over more 300 flights.
I am using Cool power Heli 30% Nitor 22% KLZ 198 oil with OSF plug and APC 15x8 prop.
motor is stable and reliable with very nice and low Idle - no problems.

Lately I noticed loss of power and the typical YS110 motor bellow is getting weaker.
I opened the motor changed the bearings, the ring and made a full valve work.
I assembled all back and motors is working very nice but still weak. To be honest, despite my hard work there is no change in power.

Any Ideas?

Very best regards

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Old 05-01-2008, 10:24 AM
Troy Newman
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Default RE: YS110FZ lost some power

Did the cylinder have any scratches in it? depending on you flying conditions, flying off dirt or grass runways will pick up small dirt and grit this can put scratches in the cylinder. This would keep the ring from sealing.

A new ring at about 250-300 flights usually is all that is needed to restore the power.

What was the ring end gap of the old ring, and that of the new one. Usually they start to loose power at about 0.014" and a new ring is around 0.004-0.006"

Another option is perhaps you have some build up on the exhaust port or the exhaust valve that is not allowing it to close 100% and its leaking a little..

Next possible is the cam gear. Do the tops of the lobes look worn excessively. They should not be at 300 flights but again it depends on the conditions the engine is run in.

Troy Newman
Team YS

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