Tech Tim
Your AD Here....
Yeah Webers aren't the greatest carb for offroad, but they're great for tunability and working on yourself. I don't know if i should be kicking myself for not stripping the EFI out of the swift, but I really like the simplicity of a carburetor. I shoulda at least saved the throttle body, it probably could have been used with a microsquirt down the road.
Webers can be made to work, but you gotta do a lot of little tweeks to get them decent.
Did some shakin' down this AM. About 10ish miles of highway driving to the local OHV area. Still very gutless on the highway, 55mph was about the best i could do on flat ground. Feels and smells like it's running lean. I was able to richen up the secondary main jet and felt a noticeable improvement on the foot to the floor uphill highway sections. all my spare jets are too small to fiddle with it anymore so off to order some more from Pierce or Pegasus.
I did modify the bowl vent on the carb with JB weld, piece of brass hobby tubing and a chunk of plastic tubing. It did die on me in a few really bouncy sections and once when pointing down a steep incline. I think some fuel bowl slosh is to blame. Never had any issue when the nose was pointed up though, like Weber's typically do.
carb vent:
You need to snorkel the air idle jets too. The fuel splashes up onto them and they choke out.