Hello.
A good flying buddy gave me a U.S. 41cc Gas Engine in good shape. It is all original, operates with the factory magneto, and has a spring starter, built in and has the standard walbro carb.

Can anyone kindly tell me what size yellow tygon gas fuel line to buy for it? I know that there are multiple size options as far as the I.D. of the line, from 1/8" up. From reference charts, it appeared that the .15 to .20 sized gasoline engines used a 1/8" diameter I.D. line. I figured that the larger engines would need a larger size but I could not find a cut-off in the range charts to tell me when a larger size is needed.

Also, I have been looking for a copy of the original instruction manual for the engine and have been unable to find one. Would any one have one that they might copy to a PDF and send me a link to download one?

Thank you.

Way down in Denham Springs, Louisiana