Working on my first bike/build, a 350 Royal Enfield. Has a VM24 Mikarb round-slide, a licensed copy of the Mikuni VM24. I have a free-er flowing K&N pod filter and muffler than stock, and have upjetted from a 25 pilot/90 main stock combo to a 30 pilot/105 main as a starting point.
At the moment, the bike starts first or second kick when cold. (kick-only, no e-start) It will not start with the choke engaged and dies if you engage the choke once it's running. (I think it's technically an enrichener, but the lever says "choke.")
When warm, it gets harder to start and tends to pop and spit gray smoke through the air filter and stall out with a little kickback. It also frequently does this if you whack the throttle open suddenly from idle. (Fairly normal for a primitive slide carb without an accelerator pump, to my basic understanding, due to the sudden lean mix, right?)
I thought it was over-rich due to the choke issue, reasoning based on the enrichener making it die instead of race, along with seemingly having a good mix for cold starting without the choke. But supposedly the gray smoke is a sign of a lean mixture. What gives?
Finally, it like to die off silently as you brake to a stop. The harder you brake the worse it seems; you can counter it by revving as you apply the brakes. I don't know what's up with this...clutch drag, fuel sloshing forward during braking and starving the jets due to improper float level?
Thx for the assistance and expertise; I am only an egg.