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FS120 series iii regulator leaking.

Old 03-13-2010, 10:45 PM
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Default FS120 series iii regulator leaking.

FS-120 Series III, ~ 6 years old, lots of flights, pulling very good revs on a 15x8. No issues with anything until this one. Same fuel used all its life (10% nitro, 18% oil). OS F plug. Problem started with surging at full throttle. Found a copious fuel leak from the vent on side of regulator.
Suggestions please, short of buying a whole new carb.

thanks.

jp
Old 03-15-2010, 09:24 AM
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Default RE: FS120 series iii regulator leaking.

You need a new regulator. That's usually a service center-only part, but most O.S. service centers should be able to repair it. Just contact your regional O.S. service center.
Old 03-16-2010, 07:32 PM
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Default RE: FS120 series iii regulator leaking.

Bax...Thanks. I have recently found a spare part listed for the regulator cover, which doesnt make sense when all I have read says 'Dont Open This item.' When I look closely at the regulator, I can see that the sides 90degrees from the fixing screws are not sitting flat on the middle plastic part , which might explain the leak? Would a new cover be a good start?
jp
Old 03-17-2010, 10:26 AM
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Default RE: FS120 series iii regulator leaking.

If the regulator parts don't fit correctly, then we'd also assume that the bad fit is the cause of the leaking.
Old 03-19-2010, 06:37 AM
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Default RE: FS120 series iii regulator leaking.

Well, for anybody else who gets this problem, and based on our experience, you all will sooner or later, the part no for the Regulator overhaul kit is 45582500. It includes a NEW and DIFFERENT cover plate, inner plate with diaphragm, and two new screws. One of our local hobby shops actually had one in stock, A$21.85, ~US$20.
Now if Only I could find something similar for the Series II FS120 I would be much happier. Then if I could get rid of the same problem on the FS120-SP thats only done 30-40 flights, I would really be laughing.
jp

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