Carb Tip
 

I rebuild and repair lots of little engines, from stock rebuilds up through my "full tilt boogie" hop up projects. When I do a rebuild on any engine, whether a 500 inch V8 or a 1 cubic inch weedeater engine, I always rebuild the carb too.

I have a test stand that I use for the little engines, and on it, I have a good size fuel tank outfitted with a longish length of clear fuel line. This way, I can monitor the fuel being drawn up to the carb while choking the engine. I have always wondered why one engine will draw fuel perhaps say 6" per prop flip, while another, identically prepared engine with the same model carb might only pull fuel about 1" per prop flip.

I think I just stumbled across the answer, and I am really surprised I never considered it before myself. Click on "More Comments" near the bottom of the page, and read the first comment here:

http://www.instructables.com/id/How-...ne-Carburetor/

Don't pay much attention to the Instructable itself, as I disagree with it on several points. Also, don't sand the carb as the comment suggests. It should be sanded on a perfectly flat surface such as a piece of glass, while keeping the carb perfectly flat and using alternating strokes. Start with #220 paper and work up to 1500, or you'll be at it forever. Actually number 800 paper would be plenty fine enough paper and finish.

I will be doing this on all my carbs from now on....

AV8TOR

The "sand the flapper mating surface" post is now right under the video link, but yes, it sounds pretty good. Thanks.