Having spent some time recently wrestling with the rebuilding of my Sq4 BA gearbox, I am confused here. Why does the sprocket spacer have anything to do with mainshaft end float? Surely the mainshaft end float is controlled by the location of the mainshaft bearing and the length of the kickstart rat...

I have finished the gearbox to my satisfaction and now need to put some lubricant in. Apart from a little squirt of oil here and there on assembly the box is empty. I know this subject has been done to death, but I have been given a can of commercial vehicle semi fluid grease for the automatic oilin...

Thanks Nev. I will happily take your advice.

The 1947 Square 4 I am building was about as dismantled as you can get. My current project - the gearbox was no exception, except extra parts were in the box to make life more interesting. However I have fully built the gearbox and it does work, engaging all gears and free in neutral, UNTIL I do a f...

Our treasurer has kindly fixed me up with a set of correct springs and cups. Just for reference, my shorter cups are correct but the long springs although similar to look at are a much heavier version, being 1.75 inch long with 8 coils of 2.0mm dia. wire, whereas the correct spring is 1.625 inch lon...

Thanks Paul, that is what I need to know. So the shorter shaft is from a single. You seem to infer then, that the springs like the longer cup I have are also from an inferior make, as when installed in the shorter cups, they poke out a long way! As for the main shaft, I am fairly confident it suits ...

I am piecing together a BA gearbox and clutch to fit a 47 Sq4, from boxes containing the dismantled giblets of a couple + Burman gearboxes and clutches. Am I correct in thinking, that the lower of the two mainshafts pictured is the one to use and what might the shorter shaft fit? Amongst the clutch ...

Pm on the way Dave.

Looking at the Draganfly parts lists, I see they do a 40t as well as the normal 44t clutch sprocket for twins and fours. I am missing the 44t sprocket for my NH engined project and I am wondering whether to buy a 40t sprocket for my 47 Sq4, which I do find a bit "buzzy", being a four and f...

Having been a BSA enthusiast until I bought my first Ariel (a dismantled 4G) nearly 10 years ago. I knew nothing about Ariels and largely that is still a fair description, so I joined the AOMCC. It was a great move as the club and forum were an essential source of help in the completion of that proj...