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06-04-2011 04:12 PM  8 years ago
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MartyH

rrProfessor

USA

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OS91SZ-H shims
It's 1 shim for 15% fuel yes? I bought a used OS 91SZ-H engine that had 3 shims in it.

Marty
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06-04-2011 05:01 PM  8 years ago
MartyH

rrProfessor

USA

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I had 2 .008's and a .005. I'm guessing from memory that stock it has 1 .008 shim installed for 10% and 15% fuel. That's what I put it together with and will go try it.

Marty
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06-05-2011 12:25 PM  8 years ago
jsenicka

rrProfessor

Eagle River, WI

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Down here at sea level we fly .020 (two ,oo8 and one .004) for Wildcat CY30 blend. Any less and we get detonation on hotter days. Sounds like someone had that one setup for CY30Jim Senicka
Team Manager, GrandRC Flight Team
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06-06-2011 12:10 PM  8 years ago
MartyH

rrProfessor

USA

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Well, I went with a single .008 brass shim and it seems to be happy. I run Wildcat 15% Helimix. It tuned in great and runs fine. I have about a gallon through it already. I'm satisfied. Outside temp has been in the 80s and elevation is 560ft.

If anyone knows definitively that I'm headed for trouble I'd appreciate a heads up.

Marty
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06-08-2011 03:35 AM  8 years ago
Kloss08

rrApprentice

Bradford PA USA

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order a new rear berring then you will need it.Team Futaba
Team Pulse Batteries
Enjoy it today
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