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I have a yamaha g2 gas cart. It was sputtering and backfiring. The throttle cable was sticking open so i replaced that. Still doing the same thing. Sometimes the starter would not engage and discovered it would go with a little push. Removed the starter and the brushes were bad, so i replaced them. Put back together, still does the same thing. I noticed today that the backup buzzer would not work all the time, but if i rocked the cart forward or backward it would start to buzz. Traced the wiring to see which wires would be connected to something moving when engine moves. Besides the starter motor the only other wire i could see is the one going in by the flywheel. Disconnected that wire and rocked the cart forward and back, could not get the buzzer to come on. Bad ignition pick-up??? Could this be causing my starter to not engage and my sputtering and backfiring?
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It sounds like you're dealing with a couple of different issues here, but I want to start by addressing one of the most common problems in Yamaha G2 carts, loose or corroded ground connections. These carts are notorious for having grounding issues which can cause inconsistent starter engagement like you're seeing. To remedy I’d recommend taking the time to clean and sand down all the ground connections you can find, especially where wires connect to the frame or any metal components. Pay special attention to the ground wire on the engine block. You can even temporarily run a jumper ground wire from the engine block or other key components to another solid ground just to rule out any grounding problems.
I do think there’s more than just one issue at play here, but we want to tackle things one step at a time. Let’s focus on getting the starter to spin consistently before moving on. Once you’re sure the starter is working properly, we can start looking into the other symptoms like sputtering and backfiring which are likely related to spark or fuel delivery. But without a consistent starter, troubleshooting those will be difficult. Also, while you're checking connections, I’d recommend swapping in a known good battery just to eliminate that as a potential cause. Low voltage can also cause inconsistent starter engagement.
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