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81
A7 & A10 Engine / Re: BSA A10 Breather Replacement - Advise
« Last post by ALPH1 on 18.09. 2019 15:41 »
all back in and turning over OK. no jamming up and seems smooth now on to cleaning all the oil pipes.

John.. Could not find any play on the shaft. This normal?

Thanks
Al
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Lovely sunny autumnal afternoon here in Kent so I fired up the grey Fergie and cut a few more logs before winter arrives.

Jim
83
A7 & A10 Engine / Re: BSA A10 Breather Replacement - Advise
« Last post by Swarfcut on 18.09. 2019 13:53 »
Grease to reach about halfway up the big sprocket....that's plenty.
84
A7 & A10 Engine / Re: Engine failure troubleshooting
« Last post by Swarfcut on 18.09. 2019 13:50 »
Thanks Flash... Carbon clogging up the slip ring will fire both plugs at the same time if the HT is strong enough to track around the slip ring, so a nice clean  and a check on those brushes will eliminate another potential cause. Could account for the spitting back.

 Any insulating material  shaped to size will do in the short term to replace the missing tit.

Swarfy
85
Introductions, Stories & Pictures / Re: Just a picture
« Last post by Greybeard on 18.09. 2019 13:50 »
Great image!
86
A7 & A10 Engine / Re: Engine failure troubleshooting
« Last post by owain on 18.09. 2019 13:29 »
Thanks Swarfy, perhaps I need to recheck the tappet clearances again since rebuilding the engine. I haven't got my compression test kit with me at the moment, just a toolbox with the basics. The only compression test I've done is placing a thumb on the spark plug hole. Very rough test. I've removed the point assembly to give the points a quick clean and lost the little rubber grommet that sat between the metal arm and the points lever. Is this just to keep the lever in place i.e. I can replace it with any piece of non-conductive material?

An update on checking the fuel lines though. I've taken the carb to bits. Jets are clear but the tube that accommodates the float needle had a small piece of material in there. Not sure if it was large enough to cause a stoppage but then again anything where it shouldn't be isn't helpful. There was some a few rust particles from trapped behind the gauze filter in the carb. I removed the petrol taps and they both seemed pretty. I gave everything a clean and will removed any bits. I'm off to B&Q to get some clear tube to replace my fuel lines which look like they could crack at any moment.
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A7 & A10 Engine / Re: Engine failure troubleshooting
« Last post by Flashgreubon on 18.09. 2019 13:28 »
Just to remind you that there are a lot of faulty soft mag brushes around that wear to nothing in no time!
88
A7 & A10 Engine / Re: Engine failure troubleshooting
« Last post by Swarfcut on 18.09. 2019 12:53 »
A fire is perhaps an indication of another fault. Sure it was the carb? A petrol soaked magneto is an obvious a fire source, but for a carb to light up means it has fired and spat back through the inlet manifold.  If a compression check and tappet clearances are OK, meaning the valves are sealing, could be the ignition timing is out, and it fired while the inlet valves were slightly open....or the valve timing has moved, key on camshaft sheared and cam no longer correctly timed, but here ignition will stay correctly timed to the crank. Unlikely scenarios, but something to bear in mind.

Swarfy.
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A7 & A10 Engine / Re: Rocker box- is this right?
« Last post by Duncan R on 18.09. 2019 12:51 »
Hi Bikerboy,

I also used the SRM gasket and found it stayed in place whilst fiddling around with the pushrods - would definitely use again.

Update on my oil leak issues- my mate who  resurfaced the gasket faces had to take 1mm off the cylinder head to rockerbox  gasket face to true it up ! so seriously warped. Only 5thou off the cylinder to head face. Almost oil tight got a very slight weep which is still being investigated.
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A7 & A10 Engine / Re: Engine failure troubleshooting
« Last post by owain on 18.09. 2019 12:02 »
Righto, I just tried starting the bike before reading all these comments and the damn thing caught fire! Looked like it started at the carburettor. Fortunately it was a very small fire and I had a fire extinguisher within arms length of me, so it was out within a few seconds.
Just how I like start to the morning *lol*

I've cleaned it up now and I've just removed the carb. I'll drain the tank and remove the petrol taps. I also noticed that air is escaping from the timing side cover via one of the screws when I kick it over...not sure if it is note worthy how the bike is? I'll check back on the forum regularly throughout the day to keep you updated and see how things progress!

Also to answer Greybeard, Yep the magneto has been serviced by APL magnetos a few months ago. I'd be hugely disappointed if the mag is playing up already.

Image is from post-fire extinguisher antics:
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