Vespa Grande with stock engine, CDI, SHA 13.13 carb w/ 66 jet, and some performance pipe I can't remember the name of.
I bought this thing in parts and put it together, got it running and it ran well. Decent acceleration, fast top end. At least from what I could tell with nothing to compare to. So It didn't have an air filter just pantyhose wrapped on the carb so I bought the "stock hi-flow" airfilter from treatland. Installing that killed the acceleration and max speed. So I bought some jets - 45, 55, and 60. Originally it had a 66. I installed the 55 today and it seemed to balance out the airfilter being on there but I wonder if I should just get a better air filter and THEN dial in the jet. Like this one- https://www.treatland.tv/vespa-malossi-high-flow-air-filter-p/vespa-malossi-filter-043687.htm Or go back to running no air filter and just pantyhose with the 66 jet?
Also... my exhaust pipe starts smoking after a few minutes of riding. It's not coming OUT of the exhaust but from the pipe itself. Like it's way too hot. Any ideas what would cause this?