Some of the things that have been tried are fairly simple. The object is to keep a negative pressure in the engine. If it becomes pressurized, oil will pump up the timing chest tube. That tube is intended to return any oil from the catch can to the engine.At this point I have blocked the return tube and installed a brass drain cock in the catch can to facilitate draining the goo. I cleaned off the engine and bike thoroughly, which enables me to get a better idea of where the oil is going. So far, I have seen no evidence of it going through the catch can, nor do I see any signs of weeping. I also replaced all the hose clips with real screw type hose clamps. While it is no longer escaping through the breather network, oil is still disappearing. With 10,000 miles on the odometer, I am beginning to wonder if my rings are letting oil be burnt. After having adjusted the valve pushrods, I can stand on the starter without losing compression, though. I replaced the plug last week and found that the old one was pretty crusted with carbon, but it had been in there for about 6,000 miles. I haven't looked at the new one yet.
I have a continuing problem with disappearing oil at higher speeds (higher than 50mph). I have the free flow exhaust and air cleaner on my 2005 ES with 18 tooth sprocket. The slightest blockage in my breather tube will cause oil to squirt out of the timing case tube, on one occasion thick enough to cover the windshield of the car foolish enough to stay behind me in the right lane of Rte 301.I have blocked off the tube from the timing chest, but oil still seems to disappear at the rate of about a pint in 20 to 30 miles when I am riding above 50 mph. To paraphrase the old song, I just "Put a little oil in the old saddle bags and ride, ride, ride!" but I would like to find a better solution. Has anyone tried the Bunn Breather on a Bullet?Yrs,Bill in Bethesda Maryland
Blocking the tube from the timing chest will make matters worse because it is the return route for the oil that the positive pressure in the crankcase has pushed to the catch can under the seat. Make sure all the hoses are clear. You can blow them out with an air hose, and then check, the airbox and air filter for excessive oil contamination. You may need to replace the filter if it is oil soaked. Then follow HRAB's advice he hits it on the head.
Mike and others;Well I think my catch can has been retired from the bike by the previous owner being that I don't see one on the bike. My crank case vent pic below shows the tube entering right into the air box to make its journey through the intake. I pulled the box and removed the tube to test for blockage. The valve seems to be allowing suction and a slight amount of oil can be seen at the carb's inlet. I'm still concerned since I am dealing with a messy oil loss around the engine.I'd like to unplug the timing case vent hose and see if that eases the oil leakage situation. Can they both be vented directly overboard (environmentally aside) or does it require a certain amount of restriction for proper operation? Thanks Little ao
Since it looks like it's on your tappet cover i would check the head gasket, maybe re-torque the head.
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