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Old 18th July 2012, 16:44   #61
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Dear sir,

I have heard a lot about you and your skills at restoring dynamos from my friend and motorcycle mechanic Anthony.I have two dynamos from a BSA 350 BB31which need some tender loving care from you.Can you please tell me how to get in touch with you.My name is Vinay Rao and cell no is 9867630932/9594030932.
waiting to hear from you in this regards
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Old 18th July 2012, 20:43   #62
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Hi ,
I would love to help you restore your dynamos , but unfortunately I have disposed all my equipment .
I can help you by guiding you and your mechanic to get them going .
I have a person who will rewind them but assembly and fitting will be done by your mechanic .
If you wish to do the above , I will get in touch with you soon .
Regards,
Magneto .
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Old 21st July 2012, 14:20   #63
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Quote:
Originally Posted by magneto View Post
Hi ,
I would love to help you restore your dynamos , but unfortunately I have disposed all my equipment .
I can help you by guiding you and your mechanic to get them going .
I have a person who will rewind them but assembly and fitting will be done by your mechanic .
If you wish to do the above , I will get in touch with you soon .
Regards,
Magneto .

Thank you so much sir..I will be keenly awaiting for your call and also if you could suggest somebody to bring restore my BSA 350 in Mumbai..regards vinay
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Old 23rd July 2012, 16:57   #64
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Default Re: Magneto blues? Get all your magneto info here...

Quote:
Originally Posted by magneto View Post
.....unfortunately I have disposed all my equipment .
I can help you by guiding you and your mechanic to get them going .
I have a person who will rewind them but assembly and fitting will be done by your mechanic .
If you wish to do the above , I will get in touch with you soon .
Regards, Magneto .
Quote:
Originally Posted by bravismah View Post
Thank you so much sir..I will be keenly awaiting for your call and also if you could suggest somebody to bring restore my BSA 350 in Mumbai..regards vinay
Magneto's are now repaired by Christopher Hendricks in Pune. They do Bikes, cars and truck magnetos, they have a huge stock of spares.
Bikes are also done by him, preferably high end ones as bike restoration has in the meanwhile become expensive.

Cheers harit
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Old 25th July 2012, 07:54   #65
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Default Re: Magneto blues? Get all your magneto info here...

Harit is it possible to provide the address and phone number here or by PM?
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Old 25th July 2012, 15:45   #66
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Magneto's are now repaired by Christopher Hendricks in Pune.
Cheers harit
Harit
Is there anyone doing magneto repairs in Bangalore that you know?
Also what happened to Dear Lallu and Nair and the rest? Did they close down a long time ago?
Cheers
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Old 30th December 2012, 18:07   #67
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Harit
Is there anyone doing magneto repairs in Bangalore that you know?
Also what happened to Dear Lallu and Nair and the rest? Did they close down a long time ago?
Cheers

In Bangalore , John Bosco the proprietor of Ruby auto electrical works is the expert when it comes to magnetos .He has been rebuilding magnetos for many of us in south india for years now .He is reachable on 98455 69743 .

Prashanth
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Old 30th December 2012, 19:35   #68
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In Bangalore , John Bosco the proprietor of Ruby auto electrical works is the expert when it comes to magnetos .He has been rebuilding magnetos for many of us in south india for years now .He is reachable on 98455 69743 .

Prashanth
Prashanth that's good info to have. Has he been doing this for long and does he do the winding the old fashioned way or with some modern winding machine. Do you have an old bike with a mag too?
Cheers
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Old 31st December 2012, 09:46   #69
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Originally Posted by deutscheafrikar View Post
Prashanth that's good info to have. Has he been doing this for long and does he do the winding the old fashioned way or with some modern winding machine. Do you have an old bike with a mag too?
Cheers
Ruby has been around since 1971 and johns dad used to do the magnetos and since his dad passed away 10-12 years back he has taken over .He is technically sound and they have the modern winding machines as well and uses them .Since the modern epoxy coated winding wires are used its a one time winding effort post which i haven't seen any magnetos fail due to winding issues .Most of the old timers in south would know them as magnetos from kerala ,AP and TN as well used to be shipped to Bangalore and was rewound at Ruby .
Yes i have three mag bikes ....thankfully running well and no magneto issues ...

prashanth
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Old 15th January 2020, 18:55   #70
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Default Re: Magneto blues? Get all your magneto info here...

Dear Karlos/Harit ji,
Recently and just by chance I happened to see this thread. I have gained some experience with magnetos the hard way, so I thought of sharing it with Team bhp friends.

You see, I have worked with and restored several vintage outboard engines, mainly Johnson and Elgin makes. These have two cylinders but distributor is not used, there is flywheel magneto, i.e. rotating magnets with two sets of ignition coils and CB points spaced 180 degrees apart. I think the advantage of this arrangement is that there are practically two separate parallel ignition systems, one for each cylinder, so if there is any problem with one, at least one cylinder will continue firing and get you home !

I also restored a Dutch cycle motor called Bernini M13, also known as 'The Egg' because of its egg shaped 1 litre fuel tank. This uses a Wico Pacy series 90 flywheel magneto, which was standard fitment in small engines in the 50's. This magneto had two serious problems- one that its permanent (Alnico) magnets had become weak after 70 years, and the magneto spark was too weak to run the engine. The second problem was that the ignition coil was burnt out(secondary shorted). I could not find anyone in Lucknow or nearby with the expertise or equipment required to recharge(remagnetise) the flywheel magnets. But I was able to find a very unorthodox, easy, cheap, and effective solution. I wrote to Mr Andrew Prattle of Globalnet, UK, and he was kind enough to add it to his website as my solutions may be of use to others. If you permit, I am quoting my letter below-
Bantamag update

by Akhilesh Agarwal

Dear Mr Andrew Pattle,

I am a retired mechanical engineer living in Lucknow, India, and have a lifelong interest in engines, vintage cars, clocks, and cycle motors. Over the years, I have acquired and restored a rare, hard to find Lohmann cycle motor to perfect running condition, as well as a Berini M13 cyclemotor. They are both quite rare and the ones I have may be the only ones of their kind in India.

The Berini I restored recently has a Wico Pacy Series 90 (Bantamag) magneto, which had some basic problems due to which it gave a weak spark, preventing the engine from starting. The major problem was weak flywheel magnets. I refer to Wilfred’s article on Wico Pacy Bantamag, which says there is no known solution to this problem. Since I have found a way around this problem, I would like to share it with you as it may be of use and interest to others. I am giving below a copy of a letter I wrote to my friend David, who lives in the UK, about my restoration work:

Dear David,

It is very kind of you to say that ‘failure’ is not in my vocabulary, but the story of the Berini is not without failures! I think I wrote that I had purchased it second-hand from a mechanic about 45 years back when I was doing my engineering. I fitted it on my bicycle and tried very hard to get it going, which it did on rare occasions, but I could not diagnose the faults correctly due to lack of knowledge and experience. The Berini was lost for 45 long years and rediscovered recently when I demolished our old house. The taste of my past failure was still fresh in my mind and rankled, so I wanted to restore it now to erase the stigma.

It proved to be easier said than done. It was not in bad shape mechanically. I replaced the bearings. Then I found the crankcase oil seal was damaged, and so was the rotary valve plate. Crankcase compression is vital in two-stroke engines because primary compression takes place in the crankcase before transfer to the cylinder. I purchased the required oil seals during a visit to, of all places, Singapore, and carefully lapped the valve plate/seat, thus resolving the crankcase compression problem.

The major problem was the magneto which gave a weak spark. Although a Dutch product (designed by German ex-DKW engineers), the magneto is made by Wipac, Bletchley, UK. I wrote to them but did not get any response. The magneto had multiple problems, making it hard to diagnose. Firstly, the magnets had become weak and no recharging facility is available. So I got around it by drilling holes from the outside and fitting Chinese Neodymium magnets. They are very strong and recharge the original magnets by induction. But there is a polarity issue. The original pole layout was unknown. Much research on the internet and study of magneto design and function did not clear the issue, I used my own logic. I followed unipole alternate polarity rather that dipole or tripole polarity more commonly used. The Neodymium magnets I used were of 10mm diameter × 10mmmm length. Round magnets are better because you can drill holes from the outside of the flywheel just up to the outer surface of the original magnets, fit the Neodymium magnets so they are in contact and fix them in place with Cyano Acrylate. The glue should be used only after getting the polarity right, once glued the magnets are impossible to remove! It does not matter if the magnets protrude above the flywheel.

Then there was an ignition coil problem. The original coil showed low resistance in the primary but OK in secondary, showing shorting in the primary. I took it apart but found it was not shorted, I suspect actually the secondary was shorted, but not detected by the multimeter! New coils were available in the UK for an unaffordable £50(the Berini was originally purchased for £2.50!). Secondary coils are very hard to rewind at home due to large number of turns of very fine wire, so I decided to use an external ignition coil. But that needs a power coil in the magneto to power the external ignition coil primary. Conventional wisdom says that the voltage induced is proportional to the number of turns, so I wound a home made coil of 450 turns compared to only 120 in the original, but it didn’t work well. I increased the turns to 600, there was slight improvement in the spark, not still not good enough! I had some wire left over, so I wound another coil of just 150 turns, based on a different design—two coils in parallel, the first power coil driving the primary of the external coil. This reduced the resistance from 1.5 to 0.5 Ohms. In this arrangement, called energy transfer system, power transfer is maximised. It is a slight modification to the original design, but it worked! The rest is history!

Here’s a video of the Berini running.


Please let me know if I can be any further service to you.

Best regards
Akhilesh Agarwal

Pl see the following links-
Technical back ground on Wico Pacy Series 90 magnetos-
http://www.icenicam.org.uk/library/W...structions.pdf

Global net website-
http://www.users.globalnet.co.uk/~pattle/nacc/arc0126.

Video of M13 running, please hear the purring sound-
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