Smells like it is running rich? blue coming out pipes. Not tons, but enough,and guys riding behind can smell the bike running rich..
Blue smoke usually indicates that engine oil is being burned; black smoke usually indicates that your engine is running rich. Blue smoke usually has a more "rich" smell; black smoke may smell like gasoline (which is exactly what it is--partially unburned gas). (White smoke would indicate that you're burning coolant--usually the sign of a leaking head gasket.) In your case, I'd hope for black smoke over blue smoke. It's usually much cheaper to fix one than the other.
It's likely that you are having a problem with one (but not all) of your cylinders. One way to diagnose what's going on is to pull the spark plugs for each cylinder. Each should appear more or less white, possibly with some spotty deposits on it. A spark plug that is covered with fluffy black carbon isn't completely igniting the fuel in the cylinder; this could indicate a bad plug, a weak coil, or a carburetor out of adjustment. A spark plug that is oily shows that oil is leaking into the combustion chamber, most likely through worn valve guides or possibly a slipped ring on the piston itself.
While your spark plugs are out, it also makes sense to take a compression test of each cylinder. You can borrow a compression tester from many auto parts stores, and buying one isn't all that expensive, either. Test your compression with all the spark plugs pulled--that will let the engine turn over fastest and will generate the best readings. It's also best--though not always possible--to test the compression when the engine is warm. Expect a cold engine to test 10-15 psi lower than one that's been warmed up.
The compression test will show several things. First, look for consistency across all the cylinders. If one cylinder reads dramatically lower than the others, that's almost certainly where your problem is coming from. It's not particularly likely in this motor, but excessive carbon buildup can also make a cylinder read higher than it should.
If you find a cylinder with a low compression reading--and/or the spark plug has shown that something unique is happening in that cylinder--pour about a tablespoon of motor oil into the cylinder through the spark plug hole and retest. If your compression reading is much higher, then the problem is most likely in the piston rings rather than in the valves or valve guides.
The description of an older bike with highly aromatic blue smoke suggests to me that you may have an oil burning problem. If that's the case, you may be able to temporarily reduce oil consumption by bumping up to a heavier oil. However, some oil will continue to migrate into the combustion chamber until you fix the actual gap or place where the oil is leaking in. Ultimately, with blue smoke, the proper fix requires some engine work.
Jun 15, 2011 |
1983 Honda GL 1100 Gold Wing