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A buddy of mine has a '94 XR600 Honda that's been maintained well enough (indestructable bike) but lately something strange is happening:
When the bike is started up, hot or cold, it makes a knocking noise that goes away in a couple minutes.
Bike runs fine and pulls good, no noises when running or under load. Just when it's sat for a few minutes, the knocking noise starts again, and goes away. Plug is clean and the motor uses no oil. Oil & Filter is clean. Using the recommended 10/40 Honda Motorcycle oil. Ignition timing checks out.
Any ideas you MOrons?
When the bike is started up, hot or cold, it makes a knocking noise that goes away in a couple minutes.
Bike runs fine and pulls good, no noises when running or under load. Just when it's sat for a few minutes, the knocking noise starts again, and goes away. Plug is clean and the motor uses no oil. Oil & Filter is clean. Using the recommended 10/40 Honda Motorcycle oil. Ignition timing checks out.
Any ideas you MOrons?