Cylinder studs 139FMB and 139FMB-B Archive, Mash, Masai, Orion ...

Cylinder studs 139 FMB-B and 139 FMB Archive, Masai, Orion, Mash... 50

New high engine mounting studs adaptable for 50cc motorcycle Mash, Masai, Archive... with 139FMBB 50T vertical or 4FMB 139T horizontal motor. Also remember to replace your cylinder head tightening nuts if you are replacing a damaged stud. Advice: if your old stud does not loosen from the crankcase and remains stuck, you can use the locknut principle by putting two nuts on top of each other, the lower one being used to forcer with a key to extract the stud without risk of damage.

Technical characteristics and dimensions of the crankcase screw

• Brand: generic
• Total stud lengths: 194 mm and 203 mm
• Threaded end lengths:
• Stud diameter: 5 mm
• Diameter of the threads: 6 mm
• No threads: 1.00