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Hello, I have a 94 Trx300FW. The bike runs great as long as the light switch is turned on. If I turn the lights off the bike idols fine, but will backfire and spit and sputter under a load. Also, the lights have to be turned off to start the bike. I changed the ignition switch in attempt to fix the problem, did not work. The only parts I have ever changed on the bike are the ignition switch and the CDI box. I purchased the bike second hand and it ran great when I bought it. It only recently started the problem I am having.

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