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Service Data
(NA = Not Available. We are still looking for this information. We don't have all the manuals)
(NS = Not Specified. We have the manual but this is information is not specified.)

Manufacturer Year/Model: Yamaha 1978 YZ125E
Starting Frame No./Starting Engine No.: 2K6-000101
Bore Size: 56.000 - 56.020mm (2.205 - 2.206in)
Bore Taper: 0.05mm
Piston Clearance: 0.045-0.050mm
Piston Clearance Measuring Point: 18mm (0.71in) From Bottom of Piston Skirts
Available Oversizes: 56.25, 56.50, 56.75, 57.00mm
Piston Ring 1 Gap: 0.3-0.5mm (0.012-0.019in)
Piston Ring 2 Gap: 0.04-0.08mm (0.0016-0.0031in)
Piston Pin Size: 16x47mm (0.63 x 1.85in)
Wrist Pin Bearing: Needle Bearing
Clutch Spring Length: 36.00mm (Limit 35.0mm)
Clutch Plate Thickness: 3.0mm (Limit 2.7mm)
Clutch Plate Warpage: 0.05mm
Crank Big End Bearing Clearance: 0.2-0.7mm (0.008-0.028in)
Crank Run Out: 0.03mm
Front Brake Diameter Limit: NA
Front Brake Pad Minimum Thickness: 2.0mm
Front Shoe Spring Free Length: 35mm
Rear Brake Diameter Limit: NA
Rear Brake Pad Minimum Thickness: 2.0mm
Rear Shoe Spring Free Length: 35mm
Front/Rear Wheel Vertical Run Out: 2mm (0.08in)
Front/Rear Wheel Lateral Run Out: 2mm (0.08in)
Ignition Coil Resistance: Primary 0.60 Ohms Secondary 6.0K Ohms

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