Yep,
My first bike, and EX500 sat for over a year while the previous owner messed with it... mostly wiring but a lot of attempted starts.
I got it and of course thought carbs... cleaned those out and thrashed the starter for another few months trying everything to get it started.
Going with the advice "most carb problems are fixed with valve work", pulled the head and found several valves that wouldn't close due to carbon buildup (miles on the road and a couple of boneheads trying to start it for months).
Valves aren't perfect by any means, but cleaned them up and it runs about 90%. Not looking for a race bike just something to learn on so 90% is about perfect for now. I would have saved TONS of time if I had inspected the valves after obvious carb work didn't solve the problem.
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