After a hard riding session, oil is leaking from the breather pipe. Is this normal??

check around the sump breather pipe. When you replace the bottom seal it is advisable to inspect the shaft as if there is a groove there the new seal will not work as intended.

oil comsumption varies depending on how hard and under what circumstances you ride, but you are losing more then normal.
my 06 Roadking only uses about 1/4 Qt. after 2500 miles of hard riding and I have the VO2 high flow breather from V&H

It is common to have oil leaking from your breather pipe when new engine kit is installed.as the engine worn out leaking would be normal.

Oil coming out of the breather is normal on these engines by the way of design, with basically no way to stop it. There is about 1/2 qt of oil in the bottom end of an engine, as the pistons travel downwards, the air that is under them is being pressurized and is vented out of the engine by a rotary breather valve in the case. The air picks up a small amount of oil from the bottom end as it leaves, then the air/oil mist is vented either into the air cleaner (EPA Regulations) or best if vented to the atmosphere. When it's vented into the air cleaner, some if it recirculates into the engine and out the exhaust, the rest saturates the air filter and then eventually gets blown all over the side of the bike. The best way to vent it, is to route a hose from the breather system down to the frame between the engine and trans, run it under the bike on the right side, point the hose down to the ground and zip tie it in place...Be sure to point the end of the hose down & away from the tire.
If your breather bolts start to leak oil...remove them, and use brake cleaner to completely remove all oil from them, the washers, brackets and threads in the head. Use liquid teflon thread sealant on the bolt threads, and a light film of black rtv on the faces of all the washers and brackets, install everything, let sit for 24 hours, then ride.......if done properly and rtv is CURED, it won't leak...
Also note that most HD's with the oil tank mounted under the seat and are left sitting for a couple months will PUKE oil from the breather, this is due to the gravity....the oil will slowly seep through the oil pump and collect in the bottom of the crankcase and get blown out the breather when the bike is started ...

Good luck...i hope this helps

a small amount of oil from the crankcase vent hose under hard acceleration is most likely normal.American bikes don't leak oil,they mark their spot!

excessive oil comming from breathers combined with the pipes being black could be blowby depending how long ago the conversion was done if it was just done someone didnt check ring clearance or put a ring in upside down if it wasnt just done proabley time to start saving for a top end job till then nothing you can do but ride it

yh thats the breather pipe they mostly leak because there is too much oil in the crank case or compression is passing the rings are causing pressure on the oil so it gets forced out the breather

You can give the chassis number and I will send you the diagram of it, normally this would be an engine breather pipe and usually it is hanging loose, some little oil in it would be normall as some people put too much oil in the engine, but I would start worry if it start leaking badly.

mine does the same thing ive been told its normal just keep an eye on oil level but make sure engine is warm before checking it other wise it wont read properly on dip stick

and with the V50 I thought I'd achieved my ambition. It was oiltight to begin with but not long after I'd done a bit of maintenance (oil and air filter change) I started noticing drips underneath - coming from the pipe that dangles from the air filter unit (yes it still has the original [expletive-deleted] item). For a while I ignored it as there were so many other jobs needing to be sorted, but it has just got worse. After a long trip, parking it is embarrassing - especially as everyone knows that Guzzis are oiltight . . . Now it seems to me that the oil could have come from one of three places - the crankcase, or either of the rocker boxes, as all of their breather pipes go to the underside of the air filter chamber. I therefore detached the existing pipes to the rockerboxes, stopped up their ends, and ran new breather pipes from the rockerboxes to vent under the bike. I reckoned that, with three pipes dangling underneath (Sherlock Holmes' three-pipe problem?), I should be able to see which part of the machine was responsible. With me so far? Did a 21-mile trip this morning, put it back up on its stand and waited. Result - oil drips from all three pipes! Thinks: when bought, the oil level was only just above minimum on the dipstick. When I changed the oil, I filled it to the max level - and someone has suggested that this is the cause of the problem. I therefore drained some oil out, and it's now at the half-way mark though without any effect on the oil drips. I'm reluctant to drain more, though that might be the next step. If it does effect a cure, would that point to some other, underlying problem? Any ideas or suggestions welcome, as at the moment this machine is not living up to the Guzzi reputation.,The breather system on the V50 works in a peculiar way. The two pipes from the rocker covers are the main engine breathers. They go into a chamber in the air filter housing, and the tube from there to the crankcase is actually a return pipe, to get the oil recovered from the breather back into the sump. On mine, I am sure the breather then goes into the air box behind the carbs, and I didn't think I had another pipe dangling down. Certainly too much oil in the sump can cause problems in most Guzzis.,,,