wr450 '05

I have a problem, when im starting the bike it's just misfire, and when its start it wont work properly, 
spark is good, fuel too maybe some eletrical problems ? help please, i'm newbie in this forum

Is the battery charged and good condition? For reasons other people here understand, the WR needs a good battery to run correctly. If not, it will run, but run very poorly

Probably time to take a trip inside the carb and verify correct jetting, clean jets, clean accelerator pump system, etc.

Do you have stock airbox, exhaust, and throttle stop?

If so, you must change/modify them to get the bike to run well and not so hot and lean.

Read the FAQ pinned posts at the top of the forum.

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