Hey Fellas, I find myself at a loss today. The rebuild saga continues...
I ordered new push rods from Draganfly which duly turned up very smartly and I assembled things as far as initial setting of tappet clearances to then notice exhaust rockers sitting too close to the rocker box (0.010" clear, covered in a previous post)
Stripped down again and measured the new push rods carefully with my big vernier caliper. I found the inlets OK but the exhaust rods were undersize, referred back to Drags description which showed 8-17/32" Inlet and 9-17/32" Exhaust.
I got back to Drags and they confirmed after a quick check at their end and refunded my money with apologies.
I would have been happy to wait until they got new stock in but they couldn't tell me when that would be so I accepted the refund and duly ordered another set from an Australian source which have now turned up (parts made in England) and of course first thing I did was measure them only to find Inlets at 8-17/32" OK and Exhausts 9-14/32"
These exhaust push-rods are even shorter than the Draganfly parts... 3/32" is .094" or 2.38mm which is significant when magnified by the rocker ratio.
I guess I'd like to get an idea if anyone has experienced this problem or even start a survey to confirm what the length really should be? I don't know what BSA's original design intent was but my bike seems to need the longer size i.e. in line with Draganfly's quoted length of 9-17/32"
My originals measure 8-1/2" and 9-1/2" but they are all slightly bent so I can't be sure they weren't slightly longer before. I'm going to have to take this up now with the Aussie supplier but it would be very useful if we could do a bit of comparison on here to get a consensus of what size these darn things should actually be. If anyone has any loose A10 push rods on their bench I would be very interested to know what length they are
