carb help

Hey guys, trying to finish my 1981 XS650, carb was doing good but now when you start bike low idle and no throttle, took off air boxes and notice when giving it throttle my carb slides are just shaking when using throstle but not going up, what's going on?

Does anyone know of a 650 Yamaha that the carbs use a N151.067 style pilot jet? I got a pair off of e bay.The add read carbs off of a 76 xs 650 Yamaha.I think they are off of a different brand motorcycle. Can anyone help Thanks

Removed my Carb off my 1980 XS650 and pretty sure it is a Mikuni BS34. However, the float bowl doesn't look like all of the diagrams I see for the BS34. Can someone help assure me that this is a BS34 and help find a correct diagram, been going round and round about this. Thanks! See pictures:

1981 xs650-sh My carbs are flooding like hell. The floats had been replaced with plastic ones when i bought the bike. The float needle looks new but the float seat looks like the original. The needle seat o-ring was shrunk up and brittle so badly the seats just fell right out. I replaced...

Hey all, I'm looking for help finding new replacement carbs for my bike. Miles xs is back ordered for replacement carbs and I'm usually sketched out by eBay. Anyone have any suggestions on where to buy replacements? Thanks.

Anyone know why the retaining disk would move up the piston wall, and get stuck? Causing the needle to jump out of the slide? Any help would be appreciated. Here is a pick.

So my bike has been running perfect for a couple weeks. Almost decided to ride to the other side of town and more problems. I stop at the gas station and fill up and when I leave my bike feels like it wants to die but it doesn't. It drops about 200 rpms then goes back up while idling. I checked...

Thank you in advance for your help. I just am wrapping up my first build by myself and it has been one looong road. I started in February with a rusty barn find and now have a pretty sweet looking bobber. I recently switched the stock carbs out with brand new VM34 carbs. The rubber connectors...