YS 91FZ leaking....somewhere??  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> YS 91FZ leaking....somewhere??
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YS 91FZ leaking....somewhere?? - 1/5/2003 6:51:16 AM   
cmassa



Posts: 162
Joined: 1/8/2002
From: Chico, CA, USA
Status: offline 		I have about 3 1/2 gallons of fuel through my YS91FZ on a UCD3D. The engine is only 2-3 months old. It has been running great. Great power, great idle and transition. The last few days, It has started pouring fuel out somewhere. One flight will cover the bottom of the plane and wing with fuel/oil. I ran it without the cowl and it appears to be coming from the rear of the motor somewhere (around the air chamber?) I'm also seeing some black residue on the exhaust side of the engine where the cylinder meets the case. I checked all the bolts and they are tight. The gasket on the air chamber seems OK. Power at full throttle is down significantly and it wont die when I close the throttle any longer. The valves have also been adjusted. The needle valve setting seems to have gotten quite broad (ie... large changes make very little difference in how it runs.

Any ideas?

Thanks,
Chris

< Message edited by Chris Massa -- Jan 5 2003 11:09PM >


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Chris Massa
Butte R/C Club
       Post #: 1

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> YS 91FZ leaking....somewhere??
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