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As a vehicle ages, the timing gets off, and the Octane of fuel will compensate for an out of timing vehicle.
Bad gas is main culprit, also dirty/clogged fuel filter, or clogged carberetor or injectors!
Use a "GOOD" fuel system cleaner for the next 3 tankfuls, and use a higher octane fuel at the same time!!! This is important. After 3 tankfuls and 3 additions of a Fuel System Cleaner, go back to a lower octane fuel. Drive up a hill and see if the problem is gone. If not, then either take it to a mechanic and check timing, hopefully you replaced the fuel filter by then.
Hi Anonymous, for a free wiring diagram, please visit the website below. If you need more information about a specific electrical issue you can reach me at email@example.com. Good luck and have nice a day. Harley Davidson Wiring Diagrams and Schematics
The oil and transmission drain plugs are on the bottom of the transmission. The engine oil tank is there. The center plug is the engine oil and the plug on the side is the transmission drain plug, I think. I don't work on the newer bikes and I'm not sure about which plug is which. I think I'm right though. I work on the older bikes (shovelheads and such) that the dealers will no longer work.
Your ignition timing may have advanced too far. Or it is now where it should be and is making more cylinder pressure during combustion causing the gasoline to ignite to early causing detonation or ping.
Make sure the ignition timing is correct. If it is try better fuel meaning the octane rating.
If you can go up to the next octane level. For example if you are using 87 go to 89 and see if it goes away. 3 of my wife's last cars a 1986 Honda Prelude, 2000 Neon, and a 2003 Neon had some ping under medium to hard acceleration. She switched to 89 octane and the ping went away completely in each vehicle. Each of the vehicle had a good deal of miles on them.
The 2003 Neon has 75000 miles on it now and runs great on 89 octane. About a year ago I tried 87 Octane in her car and the ping came right back.