PW50 Torque Tool — MasterTune Moto Suite

Essential torque specs for your PW50 engine rebuild. Grouped by assembly, with both Nm and ft·lb values.

💥 Crankshaft & Internal Rotating Assembly

Flywheel nut45 Nm (33 ft·lb)

Primary gear nut39 Nm (29 ft·lb)

Center case bolts10 Nm (7.2 ft·lb)

🏁 Clutch Shaft (Centrifugal Clutch)

Clutch bolt (centrifugal shoe)24 Nm (17 ft·lb)

Pressure plate screws4 Nm (2.9 ft·lb)

🚀 Output Shaft (Clutch Side)

Clutch nut39 Nm (29 ft·lb)

Clutch case bolts10 Nm (7.2 ft·lb)

⚙️ Rear Drive Housing (Final Drive Box)

Drive housing bolts10 Nm (7.2 ft·lb)

Output shaft nut34 Nm (25 ft·lb)

⚙️ Pinion Shaft / Bevel Gear

Bevel gear cover bolts10 Nm (7.2 ft·lb)

📏 General Torque Guidelines by Bolt Size (Yamaha Rule of Thumb)

Bolt Size	Standard Torque (Nm)	Notes
M4	2–3 Nm	Very small — used in electronics and covers
M5	4–6 Nm	Often used for small brackets
M6	7–10 Nm	Case screws, small clamps
M8	17–25 Nm	Most engine mounts, shock bolts
M10	30–45 Nm	Axles, swingarms, cylinder heads
M12	50–70 Nm	Rear axles, crank bolts
M14	80–110 Nm	Flywheel nuts, large suspension hardware