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More magneto mire

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Re: More magneto mire

Posted by George Phillips at April 01. 2017
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!

Re: More magneto mire

Posted by George Phillips at April 01. 2017
By the way - to all those kind guys who offered help, please understand that the guy I went to is only a half hour drive away and came with good credentials so it was simply a matter of finance. Postage on a mag does mount up! Cheers George

Re: More magneto mire

Posted by George Phillips at April 12. 2017
Just to tidy up this post - new inlet cam bush fitted, new timing chain, refurbed mag, a few new gaskets and new rocker box bolts. All refitted, retimed (using the rod-down-the-hole technique (suitably corrected for 45deg angle!) pushrods adjusted and - after some initial niggles it now sounds great. Had a test run and all seems OK. Roll on Summer! Many thanks for all your interest and support. George

Re: More magneto mire

Posted by Ian MacDougall at April 12. 2017

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

Re: More magneto mire

Posted by George Phillips at April 12. 2017
Thanks Ian. I'll check that out. I've always hated throwing away old wiper blades but couldn't think of a use for them! I have an 80 m round trip to the local NOC meet on Saturday so I'll check the timing chain on my return and report back. Cheers, George

Re: More magneto mire

Posted by George Phillips at April 14. 2017
Just for fun, Ian, I did a sum based on a 14mm plug diameter and a 19mm plug depth to see if it really was vertical. Assuming an infinitely thin blade I make it 81deg above the horizontal so close enough for jazz -as Elvis used to say! The thicker the blade the less the angle above the horizontal. Still better than my 45deg method though. Cheers George

Re: More magneto mire

Posted by Ian MacDougall at April 14. 2017

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

Re: More magneto mire

Posted by richard_payne at April 14. 2017

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 !

Re: More magneto mire

Posted by George Phillips at April 15. 2017
Ian - you've spotted the flaw in my argument! I was aware that my 45deg was an assumption. I'll see how she sounds on the run today. Cheers, George

Re: More magneto mire

Posted by Ian MacDougall at April 15. 2017

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

Re: More magneto mire

Posted by anna jeannette Dixon at April 15. 2017
Previously George Phillips wrote:
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!

 

 
 Hello  yes because the woodruff key was too fat  I filed it up so it would fit right and the threads for the end nut has they been damaged the housing was not one of the best it had damage on it too  and  a brass  shim was missing  yours  anna j

Re: More magneto mire

Posted by anna jeannette Dixon at April 15. 2017
Previously Ian MacDougall wrote:

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

Hello Never ever  use anything metal  down a plug hole its damages the top of the piston  with small scratches, please use a long artist type paint brush handle end  its made of wood and rounded off too  then you can simply mark anywhere you like  for top dead centre   and the like     yours anna j

Re: More magneto mire

Posted by George Phillips at April 16. 2017
Sorry for the delay, Ian. I thought this thread was dead. 50º above horizontal gives a vertical difference (from the 45º measurement ) of 2mm or just over 1/16". So the measurement along the inserted stick would be 21mm instead of 23mm or 7/8" instead of 13/16". Not massive but if I'm going to re-do it I may as well try and get it right. See my new thread query about the effect modern fuel may have. Cheers, George

Re: More magneto mire

Posted by anna jeannette Dixon at April 17. 2017

SEE the FBHVC  website  Ethanol fuels!     Goerge !     yours  Anna J    

Re: More magneto mire

Posted by George Phillips at April 24. 2017
Righjt! All back together and going like train! I took Ian's figure of 50º at face value and calculated that a 5/8" (16mm) vertical advance was equivalent to a 13/16" (21mm) advance at 50º to the horizontal. I set it just a tad more than that to give me a bit of leeway with the ignition lever and it now sounds like a good punchy Norton should. If only I had fewer baffles......... George
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