Yes, thats is too much. I usually put in between 1.25 and 1.75 L depending if i change oil filter. Fill to the halfway mark on the stick.
For the breather...
I can take pics of mine if youd like.
Sure... a pic or two would be helpful - I don't even know what the can looks like / where it mounts.
I guess I'm substantially overfilled, that's likely the problem, fits the symptom. I wonder how these techs got that wrong, being that they service 30-odd of these bikes? They stock oil in 3L cans, 2.5 for the engine, 500mL for the primary, they say. Weird.
Mine doesn't have a catch can at all right now, I'm pretty sure that none of the AVL's here had them as OE. I need to check if some other model of Bullet came equipped with it, if so can probably order and retrofit.
Or if filling with less oil minimizes the amount being thrown out, I can just leave things as they are and fix the end of the vent down near the chain for auto-lubing (though I've got an o-ring chain now anyway).
***
I put some more distance on it today, ran up-valley several km's, a fairly steep/steady climb. I went a little heavier on the throttle, a few more revs. Engine didn't get noticeably hot doing it, I think richening the carb has helped, it actually seems to run cooler now than before the rebuild. Running very strong low / lower-mid, and no detonation at all. I'm sensing that the power's going to taper off pretty substantially at high-mid to higher rpm's though - it just doesn't seem to have that kind of "ramping up" of output that I felt in the cast iron 500 I rode recently (though this one is definitely stronger down low). Might try bolting on the 32mm CV carb / filter setup next week and gauge the effects; Besides being highly convoluted/restrictive and taking over my otherwise useful side box, the stock inlet setup is pretty leak-prone, so I want to be rid of it considering how dusty it can be up here.
If after some time with it I feel I still want more pull further up in the range, as per various recommendations here, I can think of retarding the inlet cam (or else maybe going for stock cast iron cams?) and fitting the 1-1/2" 350 pipe. I think that's about the extent of what I'd want to do with it, it runs great and hasn't cost me much to put together.
Resolved the leak (I think) in the primary case today - I believe what caused it was my mistake of installing the shaft seal behind the clutch
before fitting the housing to the engine/gearbox. Because production variations can alter the distance between the crankshaft and gearbox output shaft slightly, that seal needs to be installed
after the inner housing half is bolted to the engine/gearbox. The four mounting holes around the seal are oversized to allow the seal to center on the shaft before tightening down the bolts. The other potential culprit was a 10mm nut missing from the stud coming through from the gearbox behind the clutch.
Basically very pleased with how it's running, it's going to be a lot of fun around here locally. Even my wife felt the difference in responsiveness and pull (not sure she appreciates it entirely, though!). Earlier it took a few revs for power to build up, now it's just so immediate - despite its being CV-carb'ed.
Again, only changes were the .030" overbore/compression mod/squish, 3-angle valve job, very mild port/chamber work, removing the hot tube, and slightly opening up the header gasket and matching the header flange/inlet to it. I'm going to say it was worth that much trouble. Cylinder leakdown was minimal before starting the work, so whatever improvement is there is due mainly to the changes rather than the freshening up.
I would expect that as the engine gets more fully broken in, the performance should increase slightly.
-Eric