Bax,

I have an OS FT 160 Gemini Engine # is: 2743. How can I tell if it has the old style carb, or the new style? Also, are accessory parts available for this engine? In particular, I need the prop spacer (I'm not using a spinner for this application, and the prop nut bottoms before the prop is securely clamped).

Can you tell me what size plumbing tubing is needed to extend the exhaust?

Thanks,
Bill, AMA 4720

The "old style" carburetor was an air-bleed type.

We're not sure what you mean by "accessory parts". Also, by "prop spacer" do you mean propeller washer? If your propeller's too thin, you may need to add an additional prop washer, though we'd wonder what propeller you're using that would be so thin that the prop nut is bottoming-out before it's tight.

Okay, how can you tell if it's the air bleed type of carb? I am using a Zinger 18X6 prop, and the prop nut (barrel) bottoms out before the prop is properly clamped. The prop washer is there, as is the jam nut. As I understand from the instructions, there is an additional apacer (washer) available. Should I order this, or will the tru-turn spinner backplate that I will be using sufficient for this purpose? I have not yet ordered the spinner and backplate. I can work the prop issue out, but I would really like to know about the carb issue. I do not know how to tell the difference between the two types of carb. If I have the old style, would I be better off to order the new type carb? Thanks.