Aprilia rs4 125 chain tighten

After checking it becomes necessary to adjust the chain tension:
Place the vehicle on the rear support stand Loosen the nut (1).

ATTENTION centering wheel fixed references are provided (2-3) in the locations identified on the tensioner arm fork, before the wheel. Loosen the two locknuts (4). Act on the (5) and adjust the chain slack, on both sides of the vehicle, which coincide with the same references (2-3). Tighten the two locknuts (4). Tighten the nut (1). Check the chain slack

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loosen the axel a little enough to move the wheel rearward now tighten the adjusters the same number of turns 6 flats is 1turn now adjust wheel rearward get about 1 inch deflection up and down with you on the bike hope this helps