How Motorcycles

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chains clip type master link rivet type master link grease lubricant apply to pins clip groove pin o-rings clip side plate o-rings roller pin inside some chains are called economy chains standard chains non o-ring chains etc non-o-ring chains wear out much faster than o-ring chains x-ring type o-rings hold lubricant inside their pin better under chain flexion and actually hold little pockets of lube themselves link plates xw-ring x-ring o-ring plane of section end of pin gets riveted flattened lubricant helps pin from wearing out inside the next connecting link bushing o-rings hold lubricant inside and allow link to pivot with next link clip-type master link always install clip with open end facing away from direction of chain movement to prevent accidental removal direction of chain movement RK 520 why chains need slack the swingarm pivot point sprocket pivot/rotation point rear sprocket swingarm pivots up and down as the swingarm pivots it changes the distance between the front and rear sprockets chain is at it's most tense point when all these three points lie in one line chain will be slack when there is no weight on the motorcycle swingarm is pivoted downward pythagorean theorem right triangles c squared equals a squared plus b squared other triangles c squared equals a squared plus b squared minus two a b cosine gamma