5) Still at high throttle, perform pinch test. Briefly pinch then release fuel tube going into carb. If engine momentarily speeds up, then slows back down, you're done. If engine does not speed up, or quits, then it is too lean; richen needle some more.

6) Now throttle back to idle; let engine idle for a couple minutes.

7) Now perform another pinch test. This time pinch and hold line. The engine will want to speed up and die. If it speeds up immediately, it's too lean, richen low speed needle. It should take 4-6 seconds to speed up and begin to die. Any longer and it's too rich.

8) Also check throttle transition. With aircraft secured and engine idling for a couple minutes, advance throttle quickly to fully open. If engine hesitates, low speed mixture is too rich.

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