Looking for some advice with my 2010 Evo 300 4T. The bike has been running fine for some time, but at a trial few weeks ago the carb had come loose from the engine when the rear boot to the airbox had failed. I got it reconnected and it did run for a while, but stalled in a section so I retired.
I have replaced the boot to the air box and stripped the carb to blow out the jets and also fitted a new mixture screw. The bike now starts OK, especially when cold but as I ride it, if I hold the throttle slightly open the bike will judder and stall. If you get past the low revs it will rev OK. After a few minutes at tick-over the bike will usually stall.
Another thing I did notice was that when I have the bike on a paddock stand it ran OK, but when I then lifted it off, the movement of the bike seemed to start the symptoms – maybe something to do with the fuel supply or float?
I have tried the adjust the air screw using a type of right angle screwdriver – is it possible that the wrong setting (I was running it at 2 turns out) can make such a difference?
All feedback welcomed.