78 mm ID Clutch Drum - Clutch Bell with 12 mm x 1.50 female right hand threads

78 mm ID Clutch Drum - Clutch Bell with 12 mm x 1.50 female right hand threads.

Clutch Drum, stamped 78 mm ID clutch drum that has a hub welded to the drum with 12 mm x 1.50 female right hand threads.
These clutch drum are to be used with the 1.16" tall engine spacer like parts # 3203.

We will be changing all the Drive rollers so they can be used with the smaller engines that use the 54 mm ID clutch drums and the larger engines that use the 78 mm ID clutch drum / clutch bells with the 12 mm x 1.50 female right hand threads.

Hub OD  .98" or 24.89 mm
Stands .61" above the drum. 
.865" or 21.97 mm deep inside of drum.
Over height 1.58" or 40.13 mm
Wall  0.78" or 2.06 mm
Depth of threads .70"  or 17.80 mm

Note:  The clutch Drums shown have been Zinc Plated.  They do not require zinc plating so you may get one that is NOT zinc plated as shown in the 2nd set of pictures.