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OS FX 91 carb swap

Old 11-08-2012, 12:28 PM
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Default OS FX 91 carb swap

Hello there.
I have a new in box OSFX91. It's been in my draw since the 91 FX fistst came out.

I have just bought one of the arf dirty birds and have toyed with putting the engine in.

On doing some research I notice all the threads about carb/needle valve issues.
I have the early type of engine with the metal valve housing.
My question is can I just fit a carb with the needle valve at the front and totally dispense with the rear mounted needle valve?
If I can what's the part number?

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Old 11-12-2012, 07:57 AM
Join Date: Apr 2002
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Default RE: OS FX 91 carb swap

You will need to measure the intake diameter to see what size carburetor the engine can take. Then, purchase a .91-sized carb with that dimension at the neck of the carb that goes into the engine. O.S. doesn't have a part to fit.
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