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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › YS 91 SR Carb Problems, Fuel Pooring out
03-31-2010 03:16 AM  10 years ago
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KingJoeMack

rrVeteran

New Baltimore, Mi USA

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YS 91 SR Carb Problems, Fuel Pooring out
Well I had started up for first time, and it was running irratic, I was told I may need a new diaphram.
Order & Installed
Went to start engine, and No start, and fuel is comming out of carb.
Thought maybe I installed diaphram in reverse, turned around, and still pooring out.
Looked at YS parts breakdown, and I believe small dimple goes against lever, and button twords carb/Head.
Any Ideas?
Fly with scheduled ground contact !
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03-31-2010 04:02 AM  10 years ago
Entityofme1

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Birmingham, AL.

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There is a small dimple that shares the same surface area on a larger disc on one side of the membrane and then you have the larger dimple on the other side which sticks out further. The smaller dimple will go against the spring lever away from the crankcase and the larger one that sticks out further will go towards the back of the crankcase. Hope this helps. You also need to make sure you install the gaskets correctly as there are holes in them that allow fuel to flow between the assemblies. I chased an issue once that had me scratching my head as to why the engine wouldnt start due to no fuel delivery. Just trying to save you any other issues you might run into. There is nothing like chasing a problem and then in the meantime finding another problem or developing one inadvertantly in the process. I've done this many times and it isnt fun. Good luck.
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03-31-2010 03:28 PM  10 years ago
nofear

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Chicago - NW Suburbs, IL

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If in doubt call yspartsandservice dot com

YS customer service is top notch.
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › YS 91 SR Carb Problems, Fuel Pooring out
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