Author Topic: timing wheel?  (Read 5552 times)

Online trevinoz

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Re: timing wheel?
« Reply #15 on: 17.01. 2010 03:54 »
5/16" is close enough to 32 degrees.
Trev.

Offline emilios

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Re: timing wheel?
« Reply #16 on: 17.01. 2010 15:28 »
Well.. today i thought i was going that trip with my A10...but it just didnt happen..
It took me some time to start and when it start it didnt sound well...like was not firing all the time...
So im going for a mag rebuilt to solve all my problems with firing..
Do you have any idea how to check if my mag needs rebuilt??
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Offline MG

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Re: timing wheel?
« Reply #17 on: 17.01. 2010 15:36 »
If you can preclude faulty pickups, cables, plug caps or plugs, then the problem has to be the amgneto itself.
As it occurs when its cold already, I could imagine faulty windings, slipring or earthing brush. Maybe the contact breaker is faulty? Could also be an out-of round armature.

If you don't know anyone to rebuild your magneto in Cyprus, I might help you out. If you are interested, drop me an email.
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Offline emilios

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Re: timing wheel?
« Reply #18 on: 17.01. 2010 15:41 »
Pickup are new...caps too,wire are perfect and points look good(i bougth points last year...
We have a british bike specialist here in Cyprus...(english) he came 6 years ago and he is perfect so better to go there for a rebuilt..
Thanks anyway
1956 BSA A10 Plunger
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Offline emilios

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Re: timing wheel?
« Reply #19 on: 17.01. 2010 15:43 »
Also today i took off the points plate and found that it has a brush behind...it wasnt looking in good condition...i dont know if that could cause the problem..
1956 BSA A10 Plunger
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1970 Honda cb750K0 project
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Offline MG

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Re: timing wheel?
« Reply #20 on: 17.01. 2010 15:54 »
There is a brush behind the points plate? What mageto do you have on your bike? The standard Lucas K2f doesn't have one.

Can you post a pic of that brush and where it is located?
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Offline emilios

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Re: timing wheel?
« Reply #21 on: 17.01. 2010 16:08 »
The mark point is a bolt coming the other way...i dont know if it should be that much length.
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Offline MG

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Re: timing wheel?
« Reply #22 on: 17.01. 2010 16:32 »
emilios

Please have a look at the front side of the mag. There shold be a hollow screw with the earthing brush on top. The brush behind the points plate is used for mags that don't have that to connect the mag body to armature ground.
Somehow I have the feeling that this plate does not belong in this mag. Or am I conmpletely wrong here?
I can't remember having ssen such a plate in a K2F ever.

If you don't have another earthing brush (because its no K2F mag), the one in the points plate might well be the reason for your problems. If the earthing connection is not good, it'll miss sparks.
1955 A7 Shooting Star
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Offline emilios

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Re: timing wheel?
« Reply #23 on: 17.01. 2010 16:36 »
I do have an earth brush in front of mag
1956 BSA A10 Plunger
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Offline a10gf

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Re: timing wheel?
« Reply #24 on: 17.01. 2010 16:36 »
picture1, needs to be just long enough to act as stop for the camring movement.
picture2, quite special, brush should not be there. Could be a quickfix because of some problem with the earthbrush connection at the drive side of the mag.

Looks like all parts of your mag needs to be checked thoroughly.

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Offline MG

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Re: timing wheel?
« Reply #25 on: 17.01. 2010 16:40 »
Thanks a10gf for confirming, I was doubting myself for a moment. Has been a while since I've redone the last K2F.

emilios - better have that mag checked over and rebuilt with SUITABLE parts, otherwise your problems will become a never ending story.
1955 A7 Shooting Star
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Offline emilios

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Re: timing wheel?
« Reply #26 on: 17.01. 2010 17:25 »
I will certainly go for a rebuilt to spacialist...
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Offline LJ.

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Re: timing wheel?
« Reply #27 on: 17.01. 2010 19:40 »
Emilios... The top picture showing the inside of the points housing does look rather dirty/greasy, It is important that the back is very clean for the carbon brush to make good electrical contact. The brass points plate is correct and does have this carbon brush on the back, my red A10 also has this type of plate. Some A10's have the steel contacts plate which from what I understand is supposed to be better because it does not wear away like the brass ones sometimes do. They are both interchangeable but the centre bolt is different. Clean the carbon brush and gently pull on the spring to allow a better pressure, but if carbon is too worn then a new one is needed. Make sure the earthing screw at the other end of magneto is clean and making good contact also.

Even if the windings and condenser is in need of replacing, you should still be able to start bike when cold. A poor magneto is usually noticed when it is hot as you cant get it started again until the magneto has cooled down. I would spend a little more time on cleaning and setting up before sending magneto away.

Edit: Just reading back over the whole thread... Do not make the mistake of fitting resister type plug caps or resistor High Tension cable. I was a little unsure if you had made that mistake...

Quote
I put new pickup and new plug caps...but it should be cap cause when i checked them with an multimeter they showed huge resistor....
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Offline MG

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Re: timing wheel?
« Reply #28 on: 17.01. 2010 20:54 »
I've seen such plates in Bosch and ML mags, but these don't have another earthing brush. Doesn't make sense to me, the earthing connection is made by the brush at the front of the mag and to the points plate by the tapered shaft, so what's that additional brush for? Even if it has bad contact, this shouldn't have any effect on the mag, unless the other brush is worn, too.  ????

Anyone got a clue?
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

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Offline a10gf

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Re: timing wheel?
« Reply #29 on: 17.01. 2010 21:18 »
Ahh... a mystery! 2 different versions of the brass points plate! I've seen a few k2f brass plates, but none with any brush. For different mag bodies or what?

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