Why Is my Bike Leaking Oil from the Exhaust?

By Max. D Gray. Updated: January 20, 2017
Why Is my Bike Leaking Oil from the Exhaust?

If your bike leaks oil from the exhaust it may be due to many causes. The important thing is to not miss this symptom of what may become an important and costly damage to your bike, if you don't catch it in time. When you're done with the problem, good maintenance reduces the chances of something similar happening again. To help solve the fault, here at we give answer to the question of why your bike is leaking oil from the exhaust.

Steps to follow:

The most common cause of motorbikes leaking oil from the exhaust is that there is a greater proportion of this fluid recommended for gasoline blending. This mismatch causes excess oil to be removed from the exhaust. Generally, the percentage thereof should be 2% but it is best that you consult the manual of your bike to check.


In the event that there is no problem with the mixture ratio, the cause of the the bike's oil leakage can be found in the carburetor float. This is a tilting member which floats on gasoline, which is also called float. When the mixture is at a certain level, the float closes a valve which blocks the supply of gasoline. If the float fails, it can cause the Oil output from the exhaust of the motorcycle.


A crankshaft main bearing seal that is broken can also cause that the bike's oil leakage. Deterioration of this element causes the oil to pass to the crankshaft and eventually be expelled from the exhaust end.


Changing the oil filter could also end up with a problem where the bike will leak oil from the exhaust. 10,000 or 20,000, proceed to perform this maintenance task that should not be overlooked. In general, every two oil changes motorbike, You must replace the filter.


Another cause that makes the bike leak is worn piston rings. In the event that the wear is very strong, these rings may become split. So if you meet this symptom, do not discount this possibility.


Never underestimate any symptoms of failure such as that the exhaust of the motorcycle tire oil, Albeit sparingly, as investing time and money in solving avoids a major problem.

If you want to read similar articles to Why Is my Bike Leaking Oil from the Exhaust?, we recommend you visit our Motorbike Maintance and Repair category.

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What did you think of this article?
I have a 2019 Honda CBR 500R. Oil is coming off the exhaust pipe. and my headlamps are not coming on. What could be the problem?
Check ur piston rings
Why my exaust shows some oily.
But its not leaking. just looking some oil is apply by hands
edward hart
am a bout to by a old bike 125 cc dreg kawsaiky kh a drop of oil leakt out off the back of the exhaust near the baffell whare the fumes coms out .its a 2 stroake
Why Is my Bike Leaking Oil from the Exhaust?
Why Is my Bike Leaking Oil from the Exhaust?

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