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Old September 19th, 2018, 06:37 AM   #6
greg737
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Join Date: May 2009

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Yeah, could be ignition heat related, but what are you gonna do? The EX250's ignition control box is located way back on the left hand side of the bike, it's in about the coolest location you could possibly put it.

One of my older motorcycles, a 1993 Suzuki GSF400, is a model that's known (and is notorious) for its ignition box problems. As the GSF400 ages the ignition control transistors (the three-leg Darlington Transistors that handle the high-energy grounding of the coils) in the ignition control box become less and less willing/able to do their job. Just like your EX250 they only work when cold. The only solution the GSF400 guys have come up with involves having a guy with electrical skills break into the CDI box and remove-replace these transistors.
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