I just bought a used 05 400ex. The guy bought it new, road it a couple times, putted around in the city on it, but never road anymore. But basically looks brand spanking new. But, in all this time, it has been sitting.
Has roughly 20 hrs on it. Only maintenance he has done was oil change and the valve job.
We picked it up, was low on gas, but ran completely fine in the drive way and up on the trailer.
Brought it home, has an idle problem. Put fresh 93octane gas in it. But just wont stay started until really warm, then its fine.
Took it to a friends place to ride this weekend. Would do fine.
But problem lays when under load, any gear. It almost sounds like its hitting a Fuel Cut. I would let out of the gas, get back into it, and sometimes it would do fine. Others it will still do it. Almost as if its dyeing out. Idle was, would rev fine no matter what, but sometimes would also die out even when riding/idling down hill.
I've replaced the spark plug, and air filter was a little wet, so dried that out, still has oil on filter.
Any suggestions? Clean carb? CDI box ?