The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: michael snellin on 28.07. 2013 17:48

Title: A10 small dynamo sprocket ???
Post by: michael snellin on 28.07. 2013 17:48
Hi, any one know how to remove the small sprocket ive tried all the obvious things,it does seem that it may well be the orginal sprocket really really, tight???? might have to cut it off.any ideas would be helpful.
Title: Re: A10 small dynamo sprocket ???
Post by: Ethelred on 28.07. 2013 18:50
I did mine recently and faced the same problem. In the end I used a two legged puller on the small sprocket on the dynamo. The dynamo drive sprocket was also tough and there's not enough room to get the puller in, but that eventually popped off with the use of a couple of pry bars applied simultaneously.
Title: Re: A10 small dynamo sprocket ???
Post by: trevinoz on 28.07. 2013 22:41
Sometimes you can lever them off with two large screwdrivers. Leave the nut a couple of threads on the shaft or you may noy find the sprocket.
For the really tight ones, I use a small bearing seperator.
Don't hammer the end of the shaft like many butchers do.

Trev.
Title: Re: A10 small dynamo sprocket ???
Post by: muskrat on 29.07. 2013 14:26
 Yep, haven't found one that beats on of those.
Cheers.
Title: Re: A10 small dynamo sprocket ???
Post by: RichardL on 29.07. 2013 15:17
Muskrat,

Nice. Looks like it would work well for getting the drive-side main bearing off the crank, but can't see how it helps for the small dynamo sprocket, what with the clamping bolts sticking out.

Richard L.
Title: Re: A10 small dynamo sprocket ???
Post by: muskrat on 29.07. 2013 20:50
G'day Richard. If it's stuck bad enough to need one of these, you'd have to take the dynamo off the bike.
Cheers
Title: Re: A10 small dynamo sprocket ???
Post by: sparx on 29.07. 2013 22:29
I tried a couple of pry-bars, tried a two-legged puller after grinding the legs to fit, then tried both methods with some heat with the oxy-acetyline bottles in conjunction with the puller, pry bars, and little hits from a big hammer. I ended up cutting into the sprocket with a disc cutter, parting it with a cold chisel, and ordering a new one.
   The new one went on with a bit of grease (copaslip) on the shaft.
Title: Dynamo sprocket !!!
Post by: michael snellin on 30.07. 2013 17:22
Well done to ,managed to get the sprocket off had to cut it off !!urgh !
                               thanks to everyone.

adm edit: merged with original topic
Title: Re: A10 small dynamo sprocket ???
Post by: trevinoz on 30.07. 2013 22:50
I've had some tight ones but have never had to cut one off and I have done more than most of you.
The worst one I had was on a Vincent Miller generator but it finally succumbed. It took some finding, though, after it flew across the shed!.

Trev.