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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> ys fz91
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ys fz91 - 12/1/2002 11:47:24 PM   
RS-cap



Posts: 13
Joined: 4/21/2002
From: North Liberty, IA, USA
Status: offline 		I currently have 6 YS engines and have been flying them for 5 years. The APC 15x8 prop seems to be what works best on the YS91FZ, I do wonder why you feel a need to use 30% Heli fuel, 15-25% fuels work great, just make sure you use something with 18-20% oil and at least half of it is castor.
       Post #: 1

ys fz91 - 12/2/2002 9:25:38 AM   
rtn9105



Posts: 702
Joined: 8/12/2002
From: Hutchinson, MN, USA
Status: offline 		RS-cap, why do you recommend fuel with castor oil? YS recommends fuels with all synthetic oil be used in their engines.

(in reply to RS-cap)
       Post #: 2

ys fz91 - 12/2/2002 9:52:10 PM   
maxtenet



Posts: 707
Joined: 10/18/2002
From: Towson, MD, USA
Status: offline 		YS recommends synthetic because castor gums up the fuel regulator if allowed to sit for any extended period of time. However,castor is always a good idea because of its affinity for metal and superior lean run protection and main bearing protection. Hence the dilemna. I run the season with castor but on the last run use synthetic only and then a good after run oil. After five years everything still works perfectly!
Max

(in reply to rtn9105)
       Post #: 3

ys fz91 - 12/3/2002 3:26:13 AM   
Ladyflyer



Posts: 1035
Joined: 1/13/2002
From: North Am, PA, USA
Status: offline 		Ive had no trouble with castor in YS engines. It really helps retard rust and cam gear wear. ALL of the worn cam gears in YS engines I have seen were in engines that used straight synthetic oil.

Another good prop for the 91 is the 15 x 6-10 progressive pitch. They pull vertical like a 6 pitch and give a flat out speed close to the 8 pitch props. The dive braking is not as good as the 15-8 however.

(in reply to maxtenet)
       Post #: 4

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