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Old 15-02-09, 09:05 PM   #1
Scanner Man
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Default Lister D SR1 Magento

I have an SR1 magneto for my Lister D, and have a good spark when I spin it fast by hand on the bench, but when I fit it to the engine and turn it with a handle, I can't seem to spin it fast enough to get a spark. Why would this be, and what could I do to sort it?

Many Thanks,
Lewys
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Old 15-02-09, 09:14 PM   #2
antiBRIGGSANDSTRATTON
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maybe not sparking under compression? replace the condenser first cos they cost about a fiver
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Old 15-02-09, 09:27 PM   #3
Bulbous
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Hi Lewys
I had this problem last year with our 'scrapheap challenge D' that we were trying to get going at our local fete: and I had to clean the points about 5 times, and eventually it sprang int life. I think it was just a coating of verdigree on the points.
Cheers
Dave
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Old 15-02-09, 09:29 PM   #4
The wild eye
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Make sure you are getting a good conection between the engine casting and the body of the mag


Steve
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Old 15-02-09, 09:42 PM   #5
Scanner Man
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Hi all, thanks for your replies, I think I should elaborate a little more. I haven't got the spark plug screwed into the head, I have just been testing by touching the spark plug to the magneto housing. When i spin it fast by hand, I have a good spark, but when I put the chain on and crank it by hand, zilch.

Many Thanks,
Lewys
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Old 15-02-09, 10:11 PM   #6
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My PT is exactly the same but when I put the same mag on my D it fires straight away, take it off and put it back on the Ruston...dead! Take it off, spin it once by hand, put it back on and it will run all day. Taking it to my mag man soon to get it right for the coming season.

Pete.
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Old 18-02-09, 06:43 PM   #7
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Hey Lewys
Engine149 has one for sale, if it is the right rotation? http://www.stationary-engine.net/for...ead.php?t=7168
Cheers
Dave :)
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Old 18-02-09, 07:40 PM   #8
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Quote:
Originally Posted by Scanner Man View Post
I have an SR1 magneto for my Lister D, and have a good spark when I spin it fast by hand on the bench, but when I fit it to the engine and turn it with a handle, I can't seem to spin it fast enough to get a spark. Why would this be, and what could I do to sort it?

Many Thanks,
Lewys
Before you go spending any money on condensors or another mag as has been suggested, follow the instructions on the link below which were written by a friend of mine who rebuilds mags in his spare time. It will save you a lot of hassle in the long run and is some of the best advice I have come across online regarding magnetos.

http://www.internalfire.com/modules....ewtopic&t=1393
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Old 18-02-09, 07:57 PM   #9
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Thanks for that link Mike.

Post printed out and stored in my useful file!

regards

Andrew
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