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Why do I have uneven chain tension?

I adjusted the chain on my Kymco Pulsar, which I have done numerous times in the past, but this time although the indicators are identical on both sides of the rear wheel the chain is normal for half a revolution and then very tight for half a revolution, any idea how I can fix this?

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Chain Adjustment Part cut and pasted as follows:
Adjusting the tension:
Chain tension is very important. Chain stretches during use. This is especially true during the first few times you use your saw. Always check chain tension each time you use and refuel your saw.
1. Lift lever on bar knob and turn counter-clockwise 1.5-2 turns to loosen clutch cover.
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After runnung 6 km my pulsar timing chain creat noise


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Remove the crankshaft tappet cap at the front of the motor and the timing inspection cap on the top right side of the rear cover.
Take off your valve covers.
Rotate the motor clockwise and align the TL mark with the pulsar index mark. Check that all the valves are loose on the left cylinder. The left cylinder must be at T.D.C. top dead center on the compression stroke.
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Adjust the valves on the left head first ("TL" mark). Loosen the lock nut, turn the screw until there is SLIGHT drag on the feeler gauge. It is very important that you do not over tighten the valves. The Rocker assembly floats on oil and will zero tolerance the valves all by itself. If you over tighten the valves it will push the rocker to one side and damage the rocker bearing/shaft. Hold the screw and tighten the lock nut . Recheck the valve clearances.
Rotate the crankshaft clockwise and align the "TR" mark on the rotor with the pulsar index mark. The right cylinder must be at T.D.C. at the compression stroke.Make sure all the valves are loose. Adjust the valves and recheck the tolerance after tightening.
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1 Answer

Setting the valves


Remove the crankshaft hole cap on the front cover and the timing inspection hole cap from the rear cover. remove the spark plug caps and valve covers. Put 17mm socket into the front of the motor and rotate the crankshaft counter clockwise and align the "TL" mark on the rotor with the pulsar index mark(little arrow bump).The left cylinder must be at top dead center of the compression stroke(both intake and exhaust valve rockers are loose).Now adjust the valve clearances of the left cylinder. IN: 0.08 mm (0.003 in)
EX: 0.10 mm (0.004 in)
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1 Answer

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