I have a 2002 Honda Shadow with about 100k miles. Recently, while riding, the bike was losing power at a slow speed when rolling the throttle. On the next ride, anytime the throttle was opened even a small amount, the engine would start "coughing" and then shut off.
Opening the air cleaner compartment, I found engine oil puddled in the bottom of the case. I also found a small amount of oil on the outside of the rear cylinder near the head gasket. Could these be related?
They could be related - but what you need to do is first clean out the oil that has collected in the air filter housing - and replace the air filter. Then, clean the oil from the engine - Simple Green and an old tooth brush works great for this. Wash the engine and surrounding areas with soap and water.
Now, with things cleaned off, you'll be able to tell where the oil is coming from after a short test ride. It could be that the oil you saw near the head gasket was actually running from the air box. Hopefully, a new air filter will cure the problems you had with low power and poor throttle response.
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