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A lot of things can cause a lean situation. Bikes with CV style carburetors may be self adjusting to atmospheric pressures. Bikes that have had aftermarket exhaust systems, or slip ons installed with the baffles removed can also cause a lean situation. A leaking intake manifold can as well. Bikes with smog (EGR) equipment run lean by design.

If the bike is fuel injected, the mixture is controlled by the on-board computer. If a lean condition is present in this situation, it's most likely an air leak in the manifold, exhaust manifold or air cleaner system. To check for leaks, fill a spray bottle with a weak dish soap and water solution and spray the questionable areas while the bike is running. If you see bubbles, or you hear a big change in idling, you may have a leak.

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Q: Why would your Harley Davidson run lean?
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