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Twins / BSA A10 Gearbox mainshft
« on: 18 September, 2017, 20:37:24 »
I have been waiting for a local racing company to produce a batch of 5 speed gearboxes but is taking forever. Having fitted an oversized needle roller, for the layshaft, that inner plate is now unusable. I have acquired another box and a needle roller layshaft from Draganfly, but my mainshaft, where it goes through the Clutch side bearing, has wear. I have read they can be hard chromed and ground to the correct diameter. I have only found 1 place in the south of England (Hounslow) that can do this. Has anyone a good recommendation of where I can go and an idea of price. Stripping engines, a rewire,12 conversion, electronic ignition new fork springs, I can do, machining is a new game to me.

Twins / Needle bearings
« on: 11 June, 2017, 20:24:40 »
I have converted my STD gearbox on my 1961 A10 to needle rollers. As the needle roller has no thrust washer portion that the bush has, there is nothing to hold it in place. Should I arrange to have a groove machined for a spring washer?

Twins / Gearbox play
« on: 02 April, 2017, 18:13:38 »
The lower engine is back from SRM and turning beautifully. I started changing the worn Gearbox sprocket and when off including the spring ring, rotated the mainshaft. I am convinced like the engine, it has never been touched. There is a little rotational play but pulling the shaft, probably nearly 1.5 to 2mm of lateral play. Is this excessive, as I suspect an indication of worn bearings? It is not absolutely quiet in rotation either. I am happy stripping the box and replacing gears in situ where necessary, but drifting bearings in and out, then I think it could be going away. Please reassure me the movement is not a cause for concern. Like the engine I want to do EVERYTHING now, as I do not want to strip it completely again.

Does anyone have any simple tricks to get the oil seal out.

As always, any help is gratefully received.

Lionel (not the Lionel Smith in this month's Star!)

Twins / A10 SRM Five gear custer
« on: 06 March, 2017, 11:57:43 »
I am in the process of rebuilding the engine on my A10. It needed a double rebore and the journals ground to twice a normal grind. As the engine had been left too long before a rebuild I am assuming the gearbox will need attention. The kickstart sometimes sticks, according to haynes that is the ratchet or quadrant. I have a new final drive sprocket and SRM anti drip sleeve nut. Both Haynes and the service sheet say I must remove the gearbox to change the sprocket, is this true? Also Has anyone had the SRM five gear cluster fitted, are the ratios any better?

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