Replacing exhaust stud and tapping new threads into cylinder head - 150cc GY6 Chinese scooter

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2 years ago
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gy6 chinese scooter china 150 125 50 cc engine start stop won't kill off wire wiring throttle cable plastic starter paul lab coat shpakov schpakov shapkov paulz1265 repair how to partsforscooters tao znen taizhou sunny roketa rocketa tahiti moped mopped sym honda yamaha kymco qmb 139 baja lifan qingqi sunl vento ice bear rank speedometer plug test fix dead gas change cvt transmission remove muffler exhaust engnine pull tap threads cut new stud studs pipe gasket

Torque specifications:
Exhaust studs to head (8mm size): 7.3 ft-lb or 10 Nm
Exhaust bracket to engine bolts: 18 ft-lb or 24 Nm
Exhaust nut torque (6mm studs): 8 ft-lb or 11 Nm
Exhaust nut torque (8mm studs): 12 ft-lb or 16 Nm
Muffler clamp bolts: 30 ft-lb or 40 Nm
Engine mounting bolt: 36 ft-lb or 49 Nm
Shock bolt to frame: 22 ft-lb or 30 Nm

Parts:
Exhaust studs 6mm (stock) or 8mm
https://www.partsforscooters.com/190-54-Stainless-Steel-Exhaust-Studs-with-Nuts-6mm-or-8mm
Metal exhaust gasket
https://www.partsforscooters.com/190-51-Premium-Metal-Exhaust-Gasket
Fan shroud set
https://www.partsforscooters.com/164-331-Emissions-Style-Fan-Shrouds
Fan cover gasket
https://www.partsforscooters.com/151-176-Fan_cover_gasket_qmb139

Tools:
8mm x 1.5 tap
https://amzn.to/3Hlpq7e

0:00 intro
1:02 remove the muffler
1:44 remove the engine
2:26 remove the fan shroud
2:43 drill out old studs from cylinder head
3:29 tap new threads
4:40 install new exhaust studs
5:22 install muffler
6:38 install engine
7:20 connect rear brake
7:43 conclusion

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