Hi Sprint
However, when I spoke to somebody else they advised that all you needed to do was the change all the gears on the existing RRT2 shafts to std gears, job done?
The standard and RRT2 mainshafts are different,
the standard has a spiral groove to take some oil into (or remove it?) from between the 2 bushes in the high speed gear
The RRT2 shaft is plain as the needle roller bearing runs where the spiral is on the std
I will take some photos over the next few days of the different parts and post them
Give me some time as I'm fairly busy at the moment
HTH
John
No problem whenever it is convenient to you. Your help and advice is very much appreciated.
As I have not stripped a BSA box before, let a lone a RRT2 box, it is difficult to fully appreciate the differences as there are no exploded diagrams of a RRT2 box that I have seen?
From what I understand the RRT2 box layshaft is supported by two needle bearing rather than the plain bushes of the std box? However, it seems that the bearing journals are a different size so that the two layshafts are not interchangeable?
It is also my understanding that the RRT2 box mainshaft is also supported by needle bearings? I believe it sill has the two roller bearings so does that mean that the mainshaft top gear has the two std bushes replaced by needle bearings?
Your comment about the bearing journal surfaces of the two then make a bit more sense? The spiral groves seen in the diagrams of the std layshaft, as you have indicated, either feed oil to the top gear bushes or try stop it finding its way into the chaincase, which are not present/needed with the needle bearings?
However, it seems that the journal sizes of the two mainshafts are the same size so either could be fitted, but not the layshaft?
There is still the question as to if the RRT2 and std box gears are in fact interchangeable in which case it is only a question of swooping the gears and leave the RRT2 shafts alone?
