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This happens on any bike when it has been filled with too much oil and has been taken on a long run. There is a breather pipe (for air and oil fumes) between the engine and the air filter box. When there is too much oil in the engine it pushes up the pipe into the air box, then drips out where it can. Check oil level properly, ensure bike is level, not on sidestand, read manual on how to check the oil level. If necessary take some out, the easiest way is to do a normal oil change, or repeatedly syringe oil out of the oil filler hole. Then wipe clean the airbox interior and if the air filter is oily change it.
The engine breather pipe is mostly routed to the air cleaner box, if it gets oily means the piston oil rings are the culprit. You can do one thing to make sure though, remove the breather pipe at the air cleaner housing and start the bike, see if there are signs of bluish smoke or oil vapours emitting there.
The problem is the the air breathers inside the rocker covers. Sad to say,but nearly all of them do this. One solution is to take off the air filter cover. There should be two bolts..(one on each side of the inside of the housing) that SHOULD have hoses hooked to them. If they do not have the hoses hooked to them,then that is your problem. See,these bolts are hollow,and have a nipple on the ends of them. These allow the top end to "breathe",a crankcase pressure relief if you will.Anyway,..these nipples are SUPPOSED to have a small hose on each of them,that re-direct the oil/crankcase pressure, into the carb/throttle body,which eliminates the oil running into your air filter housing.Check to make sure they are in fact there,and let me know what you find.
Oil normally comes out of the air filter area a little bit, but over time, once the oil rings start to wear, more and more oil comes out. So you can either have new oil rings replaced, or you can put in a crank ventillation valve in there and it often helps slow down the oil from entering
yer change ya gear box oil and get all the old fuel out. just basicly anything you can clean or change do it!!! air filter,oil filter,water,spark plug and so on...and when you first start it let it warm up for bout 5 mins but no longer.
Open the air box,clean it from extra oil,renew the air filter if you have to and without the air box-air filter (or opened) try to start the bike while sraying with a carb cleaner spray through the air box towards the carbs.Don't spray too much.Little bit each time and do not twist the gas grip.Choke it too if you want.It may help.Of course before all that set the oil level to normal.
hmmm, a few posibilities, might well be split cab diaphragms but overhaul should have spotted that. sounds like either too much gas or not enough, either flooding/gassing up or fuel starvation. could try running it without the aire filter too see what happens. it should run weak so if bike is better then you have too much gas, if bike worse then runnig weak to start with. I have seen this before with one particular cause.... petrol tap was leaking, gas runs past pistons when bike not running, soaks past and into crankcases. as breather recycles vapour back in to air box, when bike warm it's as rich sas hell. take of oil filler cap on engine and have a good sniff. you should smell only oil, if it's a strong smell of petrol, change oil and filter, dump petrol tap or see if new seals available.
great bike but it pisses oil into the air box.
Ends up with the luxury of a self oiling chain and a huge mess on the side of the bike. This has been happening since new.
Am I putting too much oil in the tank should I only check oil when hot to allow for expansion or is this one of those crappy little problems with this motor that I will just have to live with?aways check oil when it warm and don't overfill it. make sure the air filter stays clean. if the crank's vented to the air box a dirty air filter will allow the crank oil to be pulled into the airbox.,,