OS 90 / 7M carb - 2 questions - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-26-2011, 05:05 PM   #1
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OS 90 / 7M carb - 2 questions

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Just acquired an old Goldberg Ultimate that has an OS 90 in it with a 7m carb.
It started and ran great but wont shut off with barrel fully closed or with finger over carb. Are these motors know for any obvious air leaks ?

Also, it is setup to run with out any muffler pressure ( the plane appears to have quite a few hours on it without any repairs so i assume it has run well this way ) noticed the main needle is out about 5 turns which I assume is due to the fact there is no pressurized tank ?

Any thoughts- wondering if I should tinker or just fly it as is ...
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Old 04-26-2011, 06:07 PM   #2
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Re: OS 90 / 7M carb - 2 questions

If it runs ok and idles ok it ain't broke don't fix it. Just pull the fuel line off to kill it.

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Old 04-26-2011, 06:57 PM   #3
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Re: OS 90 / 7M carb - 2 questions

High speed turned out 5 turns is the reason it keeps running with throttle closed. Lean it out, you'll be surprised at the power it has.

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