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HI,
First u need to know your clutches
most likely 770,780,790 series comet ??
The info i am aware of applies to the above clutches fitted to a 18 vanguard v twin
1 3/16 top width belt
780 drive with a 770 driven
[there are 3 different diameters of secondary 770, 780,790]
14.75--15.0 inch centres is a 49.5 to 50 inch belt
source of belt .....richard relics ...
It is a Bando belt industrial type
NB .. between 46.5 and 52 inch belt there is little available in the ATV type
industrial type is then used
An ATV belt is constructed differently to a ATV belt and may cause some issuses
I pesonally have my setup done but i am rebuilding machine so in the near future it will be running
### the biggest issue u will have is the valve cover hitting the seat frame base therefor this will determine the centre distance and belt