Hey all,
Have a few questions about my '46 45 wl and hope someone out there can help.

When I first get on the throttle, the bike stumbles like it's not getting enough fuel. Once I get past about 1/4 turn of the throttle it's seems to clear up. Runs good otherwise. On a related note, occasionally after I shut her down, fuel begins to spill out of the vent on the top of the carb. Stuck or saturated float or needle???

Next, there is an approx. 3/16 hole near the bottom of the cam cover. I believe this is for the breather valve. I've got oil leaking from here. Normal? Would like to stop if if I can.

Thanks for any advise you can provide.

 

Been a long while since I messed with a 45 Flattie. Sold mine back in '78 or so. Anyway, a stumble off idle is usually caused by too much gas. Since you also say it spills gas out the vent when you shutdown, I'd look at any and all things to do with the float - float itself, level it's set at, float valve, float valve seat.
I don't remember where the breather is located, but I'll head out to the shop and see if I can find something.

 

Couldn't find a good illustration in the old Chilton's book I have. Have you ever checked the breather timing? Might be a good place to start.