Here's some info from two of our luminaries in the "Bullet with UCE" thread. The Hitchcocks carb kit will be very close, and they will have tuning information and parts as well. It'll save a lot of flailing. If I had a UCE it'd get a carb immediately, I see no point to overly complicating a nicely designed long-stroke, 2-valve, pushrod equipped "classic". If it stops running well, dump the water out of the float bowl and blow out the dirt. With a good filter even that's unlikely to happen. Modern electronic ignitions are pretty bulletproof. - ACR -
From ACE:
Re: Bullet 500 that won't rev past 3750rpm ; Reply #36 on: September 27, 2020, 01:22:53 pm
I am pretty sure there is a way to change the electronics over to the one used on the AVL . The early Hitchcock carb conversion kits had something like that with it.
The injector housing bolt spacing is the same as the carbed Bullets. Get a manifold and bolt it right on. However, I strongly recommend a Mikuni. Amal carbs are very poorly made, and the cost a lot of money compared to Mikuni.
You need to get a petcock conversion for the tank after removing the fuel pump.
From Adrian II:
Re: Bullet 500 that won't rev past 3750rpm ;Reply #37 on: September 27, 2020, 02:40:44 pm
If this was a carb-fitted model from the factory (some home market UCE Bullets were, the 350 carb-fiited UCEs were also exported to some markets) it will already have a petcock, probably the same one fitted to the tank with two M6 hex set screws as used on the Electra-X (but not the AVL Classic!).
For some reason the iron barrel Bullets (or at least the later ones) have 58mm carb stud centers, the spacing on the UCE 500s is 60mm, same as the AVL, I bought a UCE carb rubber cheap which also fits the PWK34 clone I bought ludicrously cheaply to try on an Electra-X, these rubbers take carbs with a 40mm stub, so a VM series Mikuni of the right size will fit, presumably the TM will as well if there's enough under-tank clearance. There's plenty of information elsewhere on the forum about folks' successful settings for various carbs, so something that works on a 500 AVL would be a good starting point.