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idle not right

  1. 400ex won’t stay running I need help plz and thx

    Repair & Maintenance
    It’s an 2002 trx 400ex Been bored to 440. Has hmf exhaust it will crank but won’t run. U have to give it 1/4 throttle for it to run but then it’s loud and the timing is right every single time. I’ve changed ever electrical part cam new battery changed the fly wheel took the head off checked the...