RS125 · 1993–2006

Torque settings

One figure per fastener. Where the two engines differ, the engine is named. The starter-motor bolts are printed twice, and both numbers are shown.

RS125 torque. Tightening order is not in this extract.
Fastener	Torque	Applies to	Note
Spark plug	20 Nm	122 and 123	—
Cylinder head bolts	30 Nm	122 only	—
Cylinder head nuts	20 Nm	123 only	—
Cylinder head cover bolts	10 Nm	122 and 123	—
Cylinder base nuts	30 Nm	122 and 123	—
Crankcase bolts	10 Nm	122 and 123	—
Clutch cover bolts	10 Nm	122 and 123	—
Clutch spring bolts	7 Nm	122 and 123	—
Clutch centre nut	80 Nm	123 only	The 122 clutch has no centre nut in the research brief. Haynes lists this nut for the 123 only.
Crankshaft pinion nut	70 Nm	123 only	—
Alternator rotor nut	70 Nm	122 and 123	—
Alternator stator bolts	10 Nm	122 only	—
Stator back-plate bolts	6 Nm	123 only	—
Alternator cover screws	5 Nm	RS125	—
Pick-up coil mounting bolts	5 Nm	122, and the shared engine table	An earlier offset reading of 2 Nm is discarded. The clean retake is 5 Nm.
Intake manifold bolts	7 Nm	122 and 123	—
Reed valve mounting bolts	7 Nm	RS125	Reed clearances themselves are not published.
Oil pump mounting bolts	5 Nm	122 and 123	—
Oil pump cover bolts	3 Nm	122 and 123	—
Water pump mounting bolt	5 Nm	RS125	—
Coolant drain bolt	10 Nm	RS125	—
Radiator bracket mounting bolt	10 Nm	RS125	—
Transmission oil drain plug	24 Nm	RS125	—
Exhaust manifold bolts	20 Nm	RS125	—
Exhaust pipe and silencer bolts	22 Nm	RS125	—
Exhaust tailpipe flange nuts	12 Nm	RS125	—
Exhaust bracket to frame	25 Nm	RS125	—
RAVE valve bolts	10 Nm	RS125	—
Engine mounting bolts, front	50 Nm	122 and 123	—
Engine mounting bolts, rear	22 Nm	122 and 123	—
Front sprocket cover bolts	5 Nm	RS125	—
Gearchange stopper arm bolt	10 Nm	122 and 123	—
Selector drum centre bolt	10 Nm	122 and 123	—
Starter motor mounting bolts	10 Nm and 12 Nm	RS125	Conflict. Chapter 2B prints 10 Nm. Chapter 9 prints 12 Nm.
Steering stem nut	80 Nm	RS125	—
Fork clamp bolts	25 Nm	RS125	Top yoke in the chapter 1 list.
Front axle nut or bolt	80 Nm	RS125	—
Front axle pinch bolt	10 Nm	RS125	—
Rear axle nut	100 Nm	RS125	—
Front brake caliper mounting bolts	22 Nm	RS125	—
Rear brake caliper mounting bolts	22 Nm	RS125	—
Front brake master-cylinder clamp bolts	12 Nm	RS125	—
Rear brake master-cylinder mounting bolts	10 Nm	RS125	—
Rear brake pedal pivot bolt	12 Nm	RS125	—
Clutch lever bracket clamp bolts	12 Nm	RS125	—
Clutch lever bracket pinch bolt	12 Nm	RS125	—
Handlebar end-weight bolts	10 Nm	RS125	—
Gear lever pivot bolt	12 Nm	RS125	—
Rider footrest bracket bolts	22 Nm	RS125	—
Passenger footrest bracket bolts	22 Nm	RS125	—
Rear subframe mounting bolts	22 Nm	RS125	—
Sidestand bracket bolts	22 Nm	RS125	—
Sidestand pivot bolt	10 Nm	RS125	—
Rear shock, upper	50 Nm	RS125	—
Rear shock, lower	25 Nm	RS125	—
Linkage, link arm to swingarm	80 Nm	RS125	—
Linkage rods to frame and link arm	50 Nm	RS125	—
Swingarm pivot bolt	100 Nm	RS125	—
Swingarm pivot adjuster	12 Nm	RS125	An earlier offset reading of 3 Nm is discarded.
Swingarm pivot adjuster locknut	35 Nm	RS125	—

Banjo bolts, bleed nipples, wheel-bearing nuts and head-tightening order areNot published in the pages this site has. Fork oil level is the same: the only level figure in the photograph sits in the RS50 block, so no RS125 level is printed here.

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Sources

Haynes manual 4298 (Aprilia RS50 and RS125 1993-2006) (opens in a new tab) — Haynes

Research brief dated 24 October 2026. Where this page says “the brief”, that is the sourced master plan behind the first edition.