Mikuni manual quadrunner6/2/2023 This circuit consists of pilot air jet(s), the pilot fuel jet(s), a pilot screw (either fuel or air screw), and pilot ports inside the carburetor throat (a.k.a. The Pilot circuit is responsible for throttle openings from Idle (0 throttle) - around 1/4 throttle. These 3 carburetor circuits can be troubleshooted by knowing the throttle opening they control. Secondly, there are 3 basic carburetor circuits: Pilot Circuit, Mid-range Circuit, and Main Circuit. By looking at the spark plug, a lean condition can be detected by a white, blistered plug. For instance, the engine sounds to be accelerating to higher RPMs, yet feels as if it has no power. Lean conditions can be detected by the engine losing power, yet retaining it's engine speed. By looking at the spark plug, a rich condition can be detected by a black, sooty plug.Ī lean mixture is caused by too little fuel compared to the amount of air being used during combustion. The black smoke you see is actually raw fuel that is not being burnt and is being wasted. In severely rich conditions, you may be seeing black smoke coming from the exhaust. Rich conditions can be detected by the engine spitting and sputtering, blurbling, or acting like a rev limiter, rapidly losing and regaining power. You either have a rich mixture, or a lean mixture.Ī rich mixture is caused by too much fuel compared to the amount of air being used during combustion. First off, there's 2 basic fuel related problems.
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