I put a new sparkplug in,It will last about 2 weeks. Then it will start and idle but when u give it some throttle it boggs and backfires and won't move and has black smoke,Put in a new plug and it will run great for another couple of weeks,Just hate having to keep buying plugs.Also my carb does'nt have a air/fuel screw.2001 Yamaha beartracker 250 4 stroke.
2001 Yamaha beartracker issues.?
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