Hi All, Sherco 2004 250 Dellorto carb
Bikes been running like a dream, until recently, after a fast 5 gear run it started to bog down and then cut out. Tried to start it again and it wouldn't start. Tried it with choke and it started, just wouldn't tick over as if the pilot jet was choked. Gave it a few revs and it cleared up ok. Anyway stripped the carb out of interest to empty the float bowl and found nothing, all jets clear.
Next outing it seems to have got worse. It will start ok first time, run for 30 seconds then bogs and dies, leave it 30 seconds and its starts again and does the same. As if its a fuel restriction that is starving the bowl from filling up fast enough.
Checked fuel pipe, inlet carb fuel filter, flow from fuel tank, pilot jet, main jet, fuel air mixture, idle screw, floats for getting stuck, inlet needle all free and good seal and not sticking.
After re-assembly it now wont start or run on anything other than choke. So in my mind the only thing left is a big air leak somewhere (replaced big end seals months ago and run fine, used viton) but everything looks fine.
Anyone else had this issue? Scratching the noggin for sure, bloody bikes..