Hi Everyone, I am new here but it looks like Yamaha XV250s will be part of my life for some years to come. My daughter loves this bike and I recently picked up an older on on the cheap for use as a "guest bike" (and a learner bike, I guess, for my grandkids). My daughter's 2008 model has been in my possession for a while due to it having been in an accident. She did not have the accident - someone else did....anyway the DAD Guarantee Insurance Company is paying to fix it. The bike has sat since last September. I repaired and upgraded a lot of parts on this bike and I am now down to making it run properly. I was not able to start it at first but I fed gas into the float bowl vent port and I was able to start it up - and ride it - although, unless I was running it at more than an idle it seemed to want to stall. It would restart and run though. I rode it for at least a half an hour and it ran "fine" (If I am feeding the fuel into the vent port, fine is a relative term.) Suffice it to say that in my mind there was nothing wrong with the idle/low speed or the high speed circuits in the carburetor. Now, the problem is that when I reconnect the fuel lines correctly, even though I can get flow through both the petcock (set at PRIme) and the vacuum fuel pump, the carburetor float bowl will not seem to either fill or fuel the engine. If I leave it set on prime for an hour or so, the engine will start for about literally two seconds and then die. I tried pumping fuel into the float bowl vent port and it will start and run briefly again. I was also surprised to find that there seems to be huge restriction in the fuel inlet port on the carburetor and the orifice (which looks to be about 1/16" or 1.5mm in diameter) for the seat in the float bowl. The first question I have is - Is the impression of a lot of back pressure - as in at least 1/2 a psi - a normal situation? The picture attached show two items. The larger item is the jet holder Internally, it is clear and clean. The smaller item seems to be a jet but it is not...there is a hole up through the center but it seems to dead end just prior to where the threads end. The bore, from the opposite end goes through the extension that had the bleed holes and dead ends about 1/16" high of the dead end from the opposite side. The next question - Is this correct? I have, of course gone into the carburetor to get these parts in order to photograph them. There actually was some fresh gasoline in there - but less than I would expect. I have reason to believe that this is a simple problem .... What am I missing? Is the float level too low? This I find hard to believe because the bike ran fine prior to the accident. Can someone offer me some insight here?