XR400 carb problems
Posted 13 May 2013 - 04:31 AM
it was stored for the last 2 years ( I was building a house) and I forgot to drain the carb. So naturally I have stripped down the carb and cleaned the green gunk out with carb cleaner. Both main jets and pilot jet were soaked and cleaned and blown out with air. (Standard Keihn carb with standard jets). New air filter and plug. So I kick it and it starts first time, sweet, but....... it will only run on full choke. No amount of backing out the fuel screw on bottom of carb can richen it enough to run without the choke on. I'm baffled at this point! Could the jets be "beyond cleaning"? Anyone have any ideas? I hate to admit defeat and take it to the Stealer oh, I mean "Dealer".
Posted 13 May 2013 - 04:43 AM
You should have removed the air diverter valve and cleaned those passages too.
Run a small wire thru all carb drillings and blow them out with cleaner and air.
Posted 13 May 2013 - 07:01 AM
I bought a bike with a pilot jet that was plugged solid, like concrete. I spun it in a drill chuck and then drilled it with a wire from a wire brush. I don't recommend this procedure because the difference between jet sizes is .001".
It's time to install new jets and clean those passages in your carb. I would recommend getting a carb kit as well.
Trailryder42 has a good carb video on here which you should definitely watch.
Posted 13 May 2013 - 07:34 AM
I just stripped down the the float bowl, jets & floats. I kept the seals away from the corrosive cleaner. So I have to strip the whole thing down, oh well I was trying to avoid that - just out of laziness I guess. I'll order the rebuild kit.
Interesting about the pilot jet, at the time I didn't have any small gauge wire to pass through it and "assumed" the cleaner did its job. Maybe it is completely closed up. I'll order new jets to be on safe side.
I swear I'm never using ethanol mix gas again!!!!
Thx for all the help, most appreciated, will get to work and let you know how I got on.
PS is there a link to that carb vid that Trail guy posted?
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