Some DT400 Jetting Stuff
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09-12-2013, 08:52 AM
Joined: Sep 2012
Location: In the hot, hot, dezert
Put the CDI box in the oven at 180 degree's for 20 minutes and see if it changes anything. An old Yamaha mechanic told me this a few months ago.
I had the same kind of symptoms on my MX125C and the CDI box was bad.
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