^ not just that a number of factors come into play..
- the mounting nuts/bolts etc do loosen up slightly and need to be re-tightened from time to time.
- Chain and sprockets start cutting and bedding in.. that eventually also adds to a lot of footrest vibration
- Seals, bearings etc start wearing out.. You need to remember that in your single cylinder engine, its reciprocatory motion that gets converted to rotational.. so when the bearings and everything starts wearing out.. the vibes go up.
- Eventually the rings also wear out beyond a certain limit and that adds to the vibrations ( the piston is free to move laterally )...
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