magneto????k2f

[michael snellin]

Hi, just want to know does the diven end of the mag??? turn clockwise when the rest of the timing gear runs ie;  the camshaft, and  the crankshaft in the direction of clockwise?? otherwise they dont mesh with the av/rt unit, a little baffling?????? somewhere i know i have it wrong.

[a10 gf]

About the mag itself, see http://www.a7a10.net/forum/index.php?topic=7620.msg53565#msg53565

[bsa-bill]

I think what your after is - crankshaft turns clockwise which turns the idler pinion anticlockwise which turns the camshaft clockwise which then turns the A/R unit (and magneto) anticlocwise
so it is the idler gear that keeps both the crank and camshaft turning the same way
I'm not so sure what you mean by

otherwise they dont mesh with the av/rt unit

is this to do with timing the magneto?, if so I'm sure we can help further , just need to know what stage your at with fitting the magneto

[wilko]

This is what confuses most people when looking for the correct rotation tacho drive!

[KenF]

Hi, just want to know does the diven end of the mag??? turn clockwise when the rest of the timing gear runs ie;  the camshaft, and  the crankshaft in the direction of clockwise?? ...

Some time ago, we put a quiz up on our web site about which way a magneto turns. See how well you can do!

http://brightsparkmagnetos.com/faqs/FAQs%20about%20magnetos%20generally/Why%20are%20some%20magnetos%20driven%20clockwise%20and%20others%20anti-clockwise.htm

Ken.

[duTch]

 

 Still ends up same rotation, but what engine is that???

[beezermacc]

Hello Michael. The magneto you have there is quite unusual and I would suspect from a Royal Enfield or even a Vincent. How do I know?.. Because the manual advance/ retard cable housing is on the right hand side of the points when looking directly at the points. I would expect all K2F's to have a 'slack cable advance' arrangement i.e the magneto is in the fully advanced position when the adv/ret cable is in the relaxed position on the handlebar lever. The magneto in your picture, if it is unmolested, is designed to run clockwise drive / anticlockwise points, so is unsuitable for A10. The majority of magnetos passing through my workshop have got mismatched components, but when the components have been swapped between magnetos of different rotation all sorts of head scratching can follow. It would be possible to use your magneto provided you have the correct cam ring and points but then you will have a 'tight wire advance' arrangement. if you send me a close up photo of the points and cam ring in situ I can let you know what you've got and how to proceed. www.priorymagnetos.co.uk   www.priorymagnetos.co.uk

[chaterlea25]

HI All,
Remember that the A10 needs a chamfered body as well !!!!

HTH
John

[trevinoz]

Not always, John.
I had a competition magneto on the RGS for years and it fitted with no clearance issues.
Getting the pick-ups out was another story, though!

Trev.

[duTch]

 Out of curiousity, never worried about this info before, but which bit needs chamfer..?
 Also, what model K2fs are normally fitted to A10/7....?
 
 I have a  42174 B with auto, and it fits fine- as per photos, but I have no idea what it's originally fitted to, even the Lucas book doesn't say, but it does mention it at least..?

[chaterlea25]

HI All,
Pictures of the chamfered body in this post

http://www.a7a10.net/forum/index.php?topic=1385.msg9873#msg9873

HTH
John

[trevinoz]

Hi Dutch,
                    Your magneto was originally fitted to a 1950 A7/A10.
Or should I say the tag was? 

Trev.

[duTch]

Thanks Trev, I've had it since late seventies, but anything could've been done to it before that...nice to know though, that at least some of it likely started out on an 'A'......
 
 it's funny that when I started on mine I had no intention of restoring, mainly 'cos of lack of info/parts,(just wanted to keep it all BSA) but as things go there's more 'legitimate' parts than I expected....the path of least resistance.....

cheers

[beezermacc]

Hi Dutch,
                    Your magneto was originally fitted to a 1950 A7/A10.
Or should I say the tag was? 

Trev.

The tag looks pretty original with the original rivets so maybe the whole body was A7/ A10 but the cam ring housing has certainly been flown in from elsewhere!

[duTch]

 

maybe the whole body was A7/ A10 but the cam ring housing has certainly been flown in from elsewhere!

 eeeerrrgh ...ok thanks Beezermacc, I've seen piccies of bikes with that cover, but not taken lots of notice, I don't care so much- just curious, cheers