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Topics - Pete A10

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Twins / A10 gearbox not selecting
« on: 20 December, 2020, 14:38:20 »
The final item on rebuilding my A10 was to fit the reconditioned magneto. To set the timing I put it in gear, turned the back wheel to set correct piston position - all ok. However problem when I came to take it out of gear - lever moved up and down but gears would not change even when turning the back wheel and hence gearbox shafts.
Removed outer and inner gearbox covers to see what was stuck. Both mainshaft and layshaft turn ok but the selector quadrant appears to be jammed in 4th gear and I cannot get it to move.
To strip the box any further I need to get the quadrant support shaft out but this is secured by a grub screw at the back of the gearbox which is inaccessible with the box in the frame. Don't want to remove the box as that means removing the engine as well!!!!!
Anybody got any bright ideas about what could be causing the problem and also whether it is possible to strip an A10 box without removing it from the bike.

2
Twins / A10 magneto earthing
« on: 06 July, 2020, 11:58:43 »
Rebuild on my A10 now nearing completion and I've just finished all the wiring. Engine is from a 1955 Golden Flash with a Lucas K2F magneto. Problem is occurring with the magneto kill switch wiring in that it is permanently earthed, which as I understand it will stop the engine running. Traced the fault through the wiring and confirmed they all switches are working properly. With the kill switch wire removed from the magneto the wiring problem goes away but the magneto itself appears to be earthing out. There is a direct connection between the earth electrode and the magneto body which doesn't sound right. When I assembled the bike I checked the magneto and it was producing sparks so my assumption was that it was ok. The bike was bought as a "box of bits" so I don't know when things on it last worked.
My knowledge of magnetos is very limited and even after reading the Lucas workshop instructions I am none the wiser. It may be they there is nothing wrong but my view is that if it is earthing out it won't start.
I would appreciate any advice anybody might be able to give with regard to the problem or whether I am worrying about nothing. The bike is not quite ready for starting and I would rather sort any problems before firing it up.

3
Twins / A10 breather pipe fixing
« on: 10 April, 2020, 12:22:45 »
Progressing with rebuilding my A10 Golden Flash and as usual its the little things that cause problems. The answer is probably obvious but I just cannot see it!! The crankcase breather pipe on the A10 is a short pipe pushed into a hole, with an interference fit, in the top left hand side of the crankcase. Looking through the Parts Book, it is held in position by a P-clip and a short 2BA bolt and nut (I have all of these). My problem is that I cannot work out what the P-clip is actually bolted to as the clip position is in mid-air and would provide no support to the breather pipe. I would appreciate any advice from anybody who knows where this bolts to.
Thanks in anticipation

4
Twins / A10 and A7 valve springs
« on: 21 November, 2019, 17:16:43 »
This is probably a stupid question but are the valve springs on an A10 the same as an A7. I've bought what are meant to be a set of A10 springs but they are too small in diameter to fit on the valve cups.

5
Twins / A10 short brake pedal
« on: 12 November, 2019, 11:02:33 »
I am looking for a shortened brake pedal to go on my A10 café racer. It is the splined type fitting a to cross spindle, not the Gold Star type. I have a standard A10 brake pedal which I could cut and weld but I don't like destroying original parts. Anybody got any idea if a shortened one is produced - like the RGS pedal but with a splined hole.

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Twins / A10 speedo drive ratio
« on: 03 November, 2019, 17:00:45 »
I'm rebuilding an A10 Golden Flash and cannot work out what is the correct speedo. Engine is from a 1955 bike. The rebuild is a complete bitsa so originality is not a problem. The speedo is driven from the standard gearbox drive and all gear ratios are standard. I have seen various repro chronometric speedos for sale (I know the quality will not be brilliant) however I am confused regarding the drive ratio. Some are shown as 2:1 and some are 15:12. Anybody know which is correct and may provide somewhere near the correct speed reading.

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