Magneto removal
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Magneto removal
First post - not much mechanical knowledge - just taken ownership of Fathers old bike I want to get roadworthy. 1951 AJS 18S not started for 50 years but in not bad nick. Initially wanting to get it going so after some advice want to send magneto away for a refurb. Taken it off apart from separating it from the magneto chain; advice please of how to separate it.
Many Thanks, Roger
Many Thanks, Roger
If no reply - Gone fishing!
- clive
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Re: Magneto removal
Not quite sure how you have almost got it off without removing the magneto sprocket. You will need a two legged sprocket puller as trying to lever it will damage the chaincase. Once the sprocket is off the mag, attached to its platform, should withdraw. Welcome to the forum, it sounds as though you would be advised to join the club as your time as a guest is limited.
Regards
Regards
clive
if it ain't broke don't fix
if it ain't broke don't fix
- Rob Harknett
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Re: Magneto removal
I would have first tried the mag. I've had bikes spent years in a field, mag was OK. 33 years later still start first kick. Never to even took the mag off or checked timing. Only cleaned points and made sure carbon pick up brush was free and clean wire connection
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Re: Magneto removal
Thanks for replies so promptly. I am a club member. Cleaned points, wasn't getting a spark on plug. Is the sprocket you talk about basically the sprocket around/behind nut I can see ,having taken the chain case off, that the chain goes round? I have taken all other fixings from the platform so it's just the connection to the chain that is preventing me removing it. Been gentle, don't want to damage anything! I have seen other posts about the two legged sprocket puller so will have to see about getting/making one. Many thanks again. Roger
If no reply - Gone fishing!
- Eamonn
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Re: Magneto removal
Roger, the Forum system doesn't see you as a full member and hence restricts what you can see/do on the Forum.RogerGillingham wrote:..... I am a club member. ....
This is because you have a different username on the Membership system to that of the Forum.
I'll send you an email with further information on how we can resolve this.
(Later edit: All sorted now)
Corners like a Lego man
- Rob Harknett
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Re: Magneto removal
You said you cleaned points. you need to check more. take the lead out the mag, check the carbon brush / spring is OK free, making contact. e do the wire, eg wire through the little washer, splayed out so makes good contact etc. Check the plug cap, either by trying on a bike that's OK or by pass it by pushing a solid bit of wire in the lead /on the plug. Cleaning points only is not enough done to consider it is the mag at fault. Mag may work when you spend £'sss on it But may only be due to the fact you have had to do the things I mentioned in getting the mag overhauled. You may have only needed a new carbon brush and spring
- Duncan
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Re: Magneto removal
Roger, it is usually easier to remove the bottom cam sprocket first, I use a tyre lever about 10" or 12" long with a ? shape on one end, it usually pops off after applying leverage in a couple of locations behind the sprocket. Sound move getting the ancient magneto refurbished at this stage as it will only let you down later as the capacitor/condenser fail and the shellac melts in the windings.
- ajscomboman
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Re: Magneto removal
Animal! You're such a cheapskate Moss! Get the correct tool, a nice little 2 leg puller does the job without the need for levers, if it's slim enough it'll slide behind the chain and just pop the whole lot off. My one does anyway. However when I can't find it, have I mentioned tyre levers work quite well.Duncan wrote:Roger, it is usually easier to remove the bottom cam sprocket first, I use a tyre lever about 10" or 12" long with a ? shape on one end, it usually pops off after applying leverage in a couple of locations behind the sprocket. Sound move getting the ancient magneto refurbished at this stage as it will only let you down later as the capacitor/condenser fail and the shellac melts in the windings.
- clive
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Re: Magneto removal
But surely the magneto will not come off with the mag sprocket still attached. Yes cam sprocket using levers if he was just retiming, but to get the mag sprocket off so that he can have the mag refurbished should not be done with a tyre lever as it will probably crack the inner timing cover.Duncan wrote:Roger, it is usually easier to remove the bottom cam sprocket first, I use a tyre lever about 10" or 12" long with a ? shape on one end, it usually pops off after applying leverage in a couple of locations behind the sprocket. Sound move getting the ancient magneto refurbished at this stage as it will only let you down later as the capacitor/condenser fail and the shellac melts in the windings.
clive
if it ain't broke don't fix
if it ain't broke don't fix
- ajscomboman
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Re: Magneto removal
Agree 100% I wouldn't use a lever on the mag sprocket despite what the workshop manual says! It's not as well supported as the engine sprocket and as you say Clive is highly likely to stress crack the ali case. A puller is recommended for this every time.clive wrote:But surely the magneto will not come off with the mag sprocket still attached. Yes cam sprocket using levers if he was just retiming, but to get the mag sprocket off so that he can have the mag refurbished should not be done with a tyre lever as it will probably crack the inner timing cover.Duncan wrote:Roger, it is usually easier to remove the bottom cam sprocket first, I use a tyre lever about 10" or 12" long with a ? shape on one end, it usually pops off after applying leverage in a couple of locations behind the sprocket. Sound move getting the ancient magneto refurbished at this stage as it will only let you down later as the capacitor/condenser fail and the shellac melts in the windings.