How rare is this?? New old stock K2FC Magneto

Johnnymac said:
Fast Eddie said:
Johnny boy... please hurry up and fit this damned magneto of yours. We need to know who wins here... the 'optimists' who say "just fit it" or the doom mongers who say the world will implode if you do.

Come on man... do the deed...
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Haha, thanks Eddie. Unfortunately the ass clown who is making my oil tank is awol again and since I sold my old one, I am in a holding pattern. It sucks.
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Bummer !
 
Fast Eddie said:
Johnny boy... please hurry up and fit this damned magneto of yours. We need to know who wins here... the 'optimists' who say "just fit it" or the doom mongers who say the world will implode if you do.

Come on man... do the deed...
Click to expand...

I say fit it! Just don't ride far from home and make sure it's down hill... lol.
 
Hey guys. I've gotten to the point where I need to fit my fancy new K2FC magneto on my Atlas. Can someone point me to a reference guide on the correct procedure for removing and installing the mag? I'm not concerned about setting the timing at this point. I read a couple things online but I'm a visual guy and pics would be nice. I'd prefer not to muck it up.
 
Once you have the timing cover off, the first thing is to break the AAU off the magneto drive shaft taper. The AAU securing nut is a self extracting bolt. If it works according to design, you simply turn the bolt CCW and it will start to come out, then an internal thread is supposed to jack the AAU off the shaft. Mine stripped out first, then I had to alter the jaws of a 2 inch gear puller to grab the drive sprocket and pull the AAU.

After that it is straight forward to remove the two flange mounting nuts on the top side of the magneto, and the lower flange bolt, which on yours should be accessible from the timing side. Early Atlas/Dommie models had a third nut on the lower flange which is a royal PITA.

Slick
 
Pay particualr attention to the conical seal on the oil pump on reassembly.
It is supposed to hold the timing cover off by a fraction of an inch, and compress for the last part of doing up the timing cover screws.
As the manual advises....

Have you verified that this maggie is a good operating unit, and the condensor is not going to give any heat related problems ?
 
Rohan said:
Pay particualr attention to the conical seal on the oil pump on reassembly.
It is supposed to hold the timing cover off by a fraction of an inch, and compress for the last part of doing up the timing cover screws.
As the manual advises....

Have you verified that this maggie is a good operating unit, and the condensor is not going to give any heat related problems ?
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Thanks guys!

Thanks Rohan. I've had my oil pump and timing cover modified by AMR in Arizona. When I pulled the timing cover, the new modification had a very nice seal. The new oring on the oil pump was actually firmly stuck in the timing cover hole (And sealed with a check ball/spring). The magneto should perform well. We installed a new condensor in it and it gave a nice spark when just turned by hand. I haven't tested it on the bike yet but fingers crossed it is all good.
 
This shouldn't be hard... but I don't know how to get the damn AAU off the magneto. I loosened the bolt at the end which enables me to slide off the c-clip. And after it slackens off a bit it just spins. What am I doing wrong? If it's been stripped in the past 50 years, what the best way to remove it?
 
Johnnymac said:
This shouldn't be hard... but I don't know how to get the damn AAU off the magneto. I loosened the bolt at the end which enables me to slide off the c-clip. And after it slackens off a bit it just spins. What am I doing wrong? If it's been stripped in the past 50 years, what the best way to remove it?
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Johnnie

it seems your extractor bolt is stripped as mine was (is). I used a 2 inch gear puller. I had to grind one of the puller arm tips to slip behind the sprocket toward the rear side (left as you would be looking at it) .... the right side is easily accessible by the puller lip.

After you loosen the bolt and get about 1/16 clearance between the AAU and the bolt head, pull on the sprocket, pushing on the head of the AAU bolt. It should "pop". The extractor bolt must be nearly fully threaded on the magneto shaft (one to two turns loose) in order to get a push on the shaft.

Keep us informed.

Slick
 
texasSlick said:
Johnnymac said:
This shouldn't be hard... but I don't know how to get the damn AAU off the magneto. I loosened the bolt at the end which enables me to slide off the c-clip. And after it slackens off a bit it just spins. What am I doing wrong? If it's been stripped in the past 50 years, what the best way to remove it?
Click to expand...

Johnnie

it seems your extractor bolt is stripped as mine was (is). I used a 2 inch gear puller. I had to grind one of the puller arm tips to slip behind the sprocket toward the rear side (left as you would be looking at it) .... the right side is easily accessible by the puller lip.

After you loosen the bolt and get about 1/16 clearance between the AAU and the bolt head, pull on the sprocket, pushing on the head of the AAU bolt. It should "pop". The extractor bolt must be nearly fully threaded on the magneto shaft (one to two turns loose) in order to get a push on the shaft.

Keep us informed.

Slick
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Thanks Slick. I guess I need to find a suitable puller. Also, is it the bolt that is stripped? If so, I guess I should buy a new one so that it's easier the next time I try to remove it. Anyone know that part number? I looked at the parts manual and I'm guessing it's part number 25105 MAGNETO FIXING BOLT NM25105?
 
I think the magneto fixing bolt is the one that fastens the magneto to the engine case...Try turning the bolt on advance more...It is supposed to act as a puller for the advance unit...I am not sure how to get that bolt out or the AAU apart...Anyone have any ideas?...
 
Beach said:
I think the magneto fixing bolt is the one that fastens the magneto to the engine case...Try turning the bolt on advance more...It is supposed to act as a puller for the advance unit...I am not sure how to get that bolt out or the AAU apart...Anyone have any ideas?...
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The coarse left-handed thread on the outside of the nut (which looks like a bolt) should push the whole ATD off the tapered shaft, as you unscrew it leftways off the shaft, because you're turning it the wrong way for the left hand thread to engage in the matching left hand thread in the ATD yoke.

Once the ATD is off the shaft, unscrew the nut clockwise through the yoke.

It's all a bit ramshackle.

The ATD is held together by a collar pressed onto the rear.
 
Triton Thrasher said:
Beach said:
I think the magneto fixing bolt is the one that fastens the magneto to the engine case...Try turning the bolt on advance more...It is supposed to act as a puller for the advance unit...I am not sure how to get that bolt out or the AAU apart...Anyone have any ideas?...
Click to expand...

The coarse left-handed thread on the outside of the nut (which looks like a bolt) should push the whole ATD off the tapered shaft, as you unscrew it leftways off the shaft, because you're turning it the wrong way for the left hand thread to engage in the matching left hand thread in the ATD yoke.

Once the ATD is off the shaft, unscrew the nut clockwise through the yoke.

It's all a bit ramshackle.

The ATD is held together by a collar pressed onto the rear.
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tritonThrasher describes it as it is suppose to work. Mine is stripped and I found the bolt to be captive in the AAU. There was no way I could get it out of the yoke, but the AAU and bolt are still functional ... just can't extract the AAU off the magneto except with a gear puller.

I am fairly sure the extractor bolt can be bought new (don't know a part number). I would not try to undo the pressed collar. I am also sure there are shops in the UK that rebuild them.

If you get it off, and find the extractor bolt captive, as I did, you can center punch the bolt, drill a shallow conical center depression with a 1/8 drill point. This will keep the gear puller screw point from slipping off the bolt on future removals.

Slick
 
Thanks guys. I asked my neighbor to give me a hand and it took him about 5 seconds to get it off. Lol. Essentially, he backed out the extractor bolt to the point where it just spun in place. He put a spring puller hook behind the head of the extractor bolt, then lightly tapped the puller with a mallet and voila, with that one tap it popped right off. I couldn't believe how simple it was and how easy it came off. I guess I was just being overly cautious.

Thanks for all your help.
 
Johnnymac said:
Thanks guys. I asked my neighbor to give me a hand and it took him about 5 seconds to get it off. Lol. Essentially, he backed out the extractor bolt to the point where it just spun in place. He put a spring puller hook behind the head of the extractor bolt, then lightly tapped the puller with a mallet and voila, with that one tap it popped right off. I couldn't believe how simple it was and how easy it came off. I guess I was just being overly cautious.

Thanks for all your help.
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Glad to hear it is off!

This is a fine example of what is good about this forum ..... Everyone learns something! I now know an easier way to get mine off.

Now is a good time to consider new timing and cam chains, and put new springs on the AAU.

Slick
 
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