More magneto mire

Anna, it's all well and good you stating the above but if we look to your earlier post, you were going to grind the body out to create clearance for an out of true armature. So maybe you can understand why certain reservations have been made.

Is a bit of a mess new armature that'sout of round by 0.005 thou which is just enough to catch in inside the body and make a contact shorting out the magneto process, So the only way I can think of is taking out about 0.005 thou out of the body the magnet fits to one side and its only magnetised steel I am grinding out bit at a time and very carefully to making measurements in-between times on my mill drill I use a fine set of stones from this process . has you cannot take anything off the armature you disturbed the windings inside

Anna's lathe method is perfectly OK. The armature is constructed in 3 separate pieces...Two ends cast in brass with cast in steel bearing spindles and the laminated steel centre section that the coils are wound on to.

The 3 pieces are located with tiny pins and pulled together with two set screws. It is easy for someone to reassemble them badly and sometimes different pieces are used if something has been damaged (spindle broken for example). After reassembly, it is often the case that the armature is not perfectly true and runs with a slight wobble, so it is fairly common practice for the complete armature to be set up in a lathe and skimmed, although the clearance to the magnet must not exceed 1 thou ( I think) as the concentration of flux through the armature is considerably reduced. Anna seems to saying it is just one small part of the magnet that is out and rubbing which is also a possibilty...not sure if she has skimmed the armature yet though?

Les

Personally, I would only entrust a magneto to a specialist, not to a marine engineer, or self taught "Expert" Possibly you can get a "Free lunch", but very rarely.

Personally, I would only entrust a magneto to a specialist, not to a marine engineer, or self taught "Expert" Possibly you can get a "Free lunch", but very rarely.

Well Anna, I can help with the money part, I have been emailing you to get an address so I can send you 15GBP for the partsbook coppies, but I have gotten no reply. I have 3 English five Pound notes left from my UK visit last summer, no good to me here, I just need to know where to send it.

Skip

Well Anna, I can help with the money part, I have been emailing you to get an address so I can send you 15GBP for the partsbook coppies, but I have gotten no reply. I have 3 English five Pound notes left from my UK visit last summer, no good to me here, I just need to know where to send it.

Skip

Well done George. Please keep us posted as to whether the new bush reduces (or even eliminates) the oil flow into the mag chain case. If it does that is the next job for the 19S. I'm sure I've mentioned this before but the inner steel strip from an old wiper blade is thin enough to go into the plug hole vertically, so no need for the 45? correction. Equally important it is long enough not to get lost in there if you let go.

Cheers, Ian McD

Looks vertical to me - dfr (do fine rightly)! And there are some handy casting lines on the head to serve as a datum. Just to stir the muddy waters some more do we know for sure that the plug goes in at 45?? Enjoy your run tomorrow.

Cheers, Ian McD

Gentlemen, may I recommend the purchase of a 16H ? They have a central plug above the piston and no valves to tangle.

I can however confirm that if one lets go of the carefully marked IKEA pencil on the downstroke, it will disappear and be crushed to smithereens before one can say 'Edgar Franks' !

Take it off and do it again !

Bad news George - I measured the plug angle last night, 50? from horizontal. But I don't think you will be re-timing for that!

Cheers, Ian

Almost at the end of this long running saga! Collected the mag from Brian Winter-Baker. New body fitted as the one I handed over had the inner end plate that holds the inner bearing broken off. He'd had it running on his test bed which I witnessed and it was sparking like a good 'un. Total cost £45 so very impressed. For those following this thread the original problems with re-assembly were 1) I hadn't tapped the Woodruff keys in far enough(they were very much an interference fit) and 2) one of the bearings was not in true causing the armature to be spinning slightly off centre hence hitting the magnets. Once trued up it all span proper! Hope to get it back on tomorrow and who knows - I may have the bike on the road buy Easter. Yippee! George PS My grateful thanks to all who contributed to this exceptionally long-running saga. I hope we've all learned something from it. I certainly have!

Well done George. Please keep us posted as to whether the new bush reduces (or even eliminates) the oil flow into the mag chain case. If it does that is the next job for the 19S. I'm sure I've mentioned this before but the inner steel strip from an old wiper blade is thin enough to go into the plug hole vertically, so no need for the 45? correction. Equally important it is long enough not to get lost in there if you let go.

Cheers, Ian McD

SEE the FBHVC website Ethanolfuels! Goerge ! yours Anna J