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Technical Discussion Forum / Re: What type of Sunbeam is it?
« Last post by phutton on October 18, 2017, 03:07:29 PM »
From the numbers, the frame is a a 1926 Model 7, which would have drum brakes as pictured. The engine is earlier, around 1922. We have this machine on our Register, listed as 1926 with 1922 engine.

I hope this helps!

P.
2
Technical Discussion Forum / Re: Model 8 Gearbox dating.
« Last post by phutton on October 18, 2017, 02:57:15 PM »
As everyone has said, this is a Sunbeam 4-speed box. The AU 520 series first appeared on the 1935 Model Year machines, and was used on all models.

Sorry for late response, but I've been away.

P.
3
Technical Discussion Forum / Re: No Spark!
« Last post by Thomas on October 17, 2017, 09:53:50 AM »
Thank you Vic & Graham!
So, that's the pick-up brush. Indeed, the oil at the brush seems somewhat suspicious. I would apply contact spray and thorough QTip cleaning. Or would I introduce even more trouble? Testing the gap separation is somewhat difficult because of limited access but I’ll try to adjust to .015 of course. If all that doesn’t help I will send it to an expert (thank you for the contact address, Graham). Cold season is at the door, anyway…  :-[
Cheers, Thomas
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Technical Discussion Forum / Re: No Spark!
« Last post by shorrog on October 17, 2017, 09:40:48 AM »
Hi Thomas
I believe the points gap (separation) should be .015 inch but you should still get a spark even if its .020 inch. The pick up is basically at the end of the spark plug lead where it connects to the magneto. There is a spring loaded carbon brush that makes contact with the ring in the magneto, its worth looking at this just to make sure it has not completely worn away or completely covered in oil.

The most common reason for no spark on an old bike is that one or more of the windings in the magneto have broken down. Sometimes you will get a weak spark when cold but then it fails on warming up. Also you can sometimes get a spark with the spark plug removed but it wont spark when under compression. Testing for a breakdown in the windings is not easy as it may only fail under high voltage conditions. If you do think that it is the windings that have failed then the best course of action is to send the magneto to a specialist and have it re-wound.

I had the magneto rewound on my model 9 by Tony Cooper, Halesowen, Birmingham 0121 559 2405 he did a good job and was reasonably priced.

Graham
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Technical Discussion Forum / Re: No Spark!
« Last post by VicYouel on October 17, 2017, 09:20:36 AM »
The pick up brush is at the magneto end of the ignition lead. The clue you give is that it is oily. Fiddly to get at .... it is either clipped in or held in by two screws. 
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Technical Discussion Forum / No Spark!
« Last post by Thomas on October 17, 2017, 07:28:33 AM »
Hello everyone,
after about 30 miles on the road some days ago my model 9 suddenly lost ignition because of missing sparks. I found a list in „The Book of the Sunbeam“ about how to remedy trouble (see attached picture). I tested according to this list. The high tension lead is intact (including a somewhat oily connection at the magneto). There is no spark without the plug by holding the cable end about 1/8 inch from metal. I hence believe that I have a problem with the magneto.

The second picture shows the situation below the magneto cover. It looks quite different to the respective image in the Book of the Sunbeam. The mimic rotates as a whole when the motor is running. It has a “fixed” cam so that the points open and close when they move over an underlying increase in a respective plate. I was not yet able to measure the point separation when they are open but would presume it to be about 1/50 to 1/60 inch. The contact breaker looks clean and not burned so that I see not need to clean or adjust it.

The last bullet talks about the “pick-up brush” but I have no idea where it is.

Does anybody had a similar problem and can give advice how to proceed?
Cheers, Thomas   
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Technical Discussion Forum / Re: Model 8 Gearbox dating.
« Last post by singleminded on October 12, 2017, 10:29:08 PM »
do you mean where the operating arm fits the gear selector shaft on the outside of the gearbox?.
My understanding is that there should be a leather washer under the large hollow nut and that gets tightened to compress the leather to form a seal..John
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Technical Discussion Forum / Re: Model 8 Gearbox dating.
« Last post by Exstress on October 12, 2017, 10:24:54 PM »
Thanks Vic, it is a 4 speed.

Is it good news that its a Sunbeam gearbox rather than a Burman?  Are selector shaft seals available to purchase anywhere, I have quite a leak from mine.

Thanks, John
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Beamers General Discussion Forum / Re: enamel or powder coat
« Last post by kbryt on October 12, 2017, 09:05:40 PM »
Stay well away from powder coating, its fit only for shopping trollies and prams.

I had my 1938 matchless done with it many years ago and regretted it ever since.

I regret it so badly I would rather have hand painted it.

basically its plastic which there is no place for on a Marston Sunbeam.
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Technical Discussion Forum / Re: Model 8 Gearbox dating.
« Last post by VicYouel on October 12, 2017, 04:22:42 PM »
Definitely a Sunbeam box and likely to be 4 speed.
Vic
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