a7 crank pinion

[edboy]

forgive my ignorance, but i m assembling a1960 a7 engine without the crank pinion 67 0641 but i have an a10 one with 2 dots stamped. is it safe to assume the dot to use for timing is next to the keyway and a10s are one tooth away from the keyway? i cant seem to find a photo of 67 0641 pinion.

[muskrat]

G'day Ed.
The 67-0641 is for the long stroke A7. You need 67-0339 same for A7 as A10.
http://www.ebay.com/itm/NOS-BSA-A7-A10-CRANKSHAFT-TIMING-GEAR-PINION-67-0339-RGS-Super-Rocket-B2103-/371865244462?hash=item5694e5532e:g:RyoAAOSwUKxYjnfV&vxp=mtr
Cheers

[beezermacc]

There's a very useful item on the Cheshire BSA Club site about the difference between A7LS gears and A7 / A10 gears
https://sites.google.com/site/cheshirebsa/tech-tips

[edboy]

thanks for both replies. i dont know why i thought the a7 valve timing was different from a10s but now i know for sure. i have looked as the cheshire bsa o.c. and impressed with tech info, but dont you just wish there was more? on my a7 engine i can move the drive side roller inner race along the shaft too easy- will locktight take care of it or will i need to heat the race first? are these ngk roller bearings cheap rubbish? the list goes on.