Yamaha YZ125 Owner's Manual

Also see for YZ 125: Parts catalog Owner's service manual Owner's service manual Owner's service manual Owner's service manual

CHASSIS8-9EAM30171FRONT FORK SETTINGThe front fork setting should be made dependingon the rider’s feeling of an actual run and the cir-cuit conditions.The front fork setting includes the following threefactors:1. Setting of air spring characteristics• Change the fork oil amount.2. Setting of spring preload• Change the spring.3. Setting of damping force• Change the compression damping force.• Change the rebound damping force.The spring acts on the load and the dampingforce acts on the cushion travel speed.EAM30172CHANGE IN AMOUNT ANDCHARACTERISTICS OF FORK OILDamping characteristic near the final stroke canbe changed by changing the fork oil amount.WARNINGEWA19190Adjust the oil amount in 5 cm³ (0.2 US oz, 0.2Imp.oz) increments or decrements. Toosmall oil amount causes the front fork to pro-duce a noise at full rebound or the rider tofeel some pressure on his hands or body. Al-ternatively, too large oil amount will causethe air spring characteristics to have a ten-dency to be stiffer with the consequent dete-riorated performance and characteristics.Therefore, adjust the front fork within thespecified range.EAM30173SETTING OF SPRING AFTERREPLACEMENTAs the front fork setting can be easily affected bythe rear suspension, take care so that the frontand the rear are balanced (in position etc.) whensetting the front fork.1. Use of soft spring• Change the rebound damping force.Turn out one or two clicks.• Change the compression damping force.Turn in one or two clicks.TIPGenerally a soft spring gives a soft riding feeling.Rebound damping tends to become strongerand the front fork may sink deeply over a seriesof gaps.2. Use of stiff spring• Change the rebound damping force.Turn in one or two clicks.• Change the compression damping force.Turn out one or two clicks.Recommended oilYamaha Suspension Oil S1Standard oil amount315 cm³ (10.7 US oz, 11.1 Imp.oz)Extent of adjustment300–365 cm³ (10.1–12.3 US oz,10.6–12.9 Imp.oz)A. Air spring characteristics in relation to oilamount changeB. LoadC. Stroke1. Max. oil amount2. Standard oil amount3. Min. oil amount