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Torque Specs

torque article illustrationThe chart below is from the Yamaha Service Manual for the Yamaha DT250B and DT400B

The chart is for stud/bolt sizes with standard I.S.) pitch threads. For bolts with other thread pitches, consult your manual. Torque specs call for clean, dry threads. Components such as the cylinder or cylinder head should be at room temperature prior to torquing. Components with multiple fasteners such as a cylinder head should be torque down in a cross-hatch pattern in successive stages until torque specification is reached.


A

(Nut)

B

(Bolt)

Torque Specification
m-kg. Ft-lbs In.-lbs
10mm 6mm 1.0 7.0 85
13mm 8mm 2.0 15 175
14mm 8mm 2.0 15 175
17mm 10mm 3.5 – 4.0 25 - 30 300 – 350
19mm 12mm 4.0 – 4.5 30 – 35 350 – 400
22mm 14mm 4.5 – 5.0 30 – 35 400 – 400
26mm 17mm 6.0 – 7.0 40 – 50 500 – 600
27mm 18mm 6.0 – 7.0 40 – 50 500 – 600
30mm 20mm 7.0 – 8.0 50 – 60 600 – 700
Spark Plug 2.5 – 3.0 20 - 22 230 - 350

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