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By carb tune, I assume you want instructions for adjusting a carburetor. Basic adjustment for small engines carburetors: Close (rotate clockwise) needle valve but do not overtighten since the coated tip may get damaged. Open (rotate counter clockwise) needle valve 1-1/4 to 1-1/2 turns. This should be ok to start the engine. Start the engine and allow to warm up for 5 minutes. Then fine tune the carburetor by SLOWLY closing the needle vale until the egine starts to stall for lack of fuel (mixture too lean). Then SLOWLY open the needle valve until engine starts to stall due to excess fuel (mixture too rich). Set the needle valve midways between the two extremes.

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17y ago

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