Triumph Triton Balance Factor

Can anyone confirm the balance factor for a triton crank in a 1964 featherbed frame. I think its 85%

 

Can’t help you with that but welcome in. Somebody will be around shortly to help.

 

Can’t help you with an answer but I wouldn’t have thought that the engine is in a 1964 Featherbed frame matters.
Surely it’s the size (cc) of the Triumph engine and whether it’s a Pre unit construction or unit construction that would be the key to finding out the balance factor. Dark man on here will most probably have the answer.

Before I forget, welcome to the forum B.T from Bedford