Posts Tagged ‘Lightning.’

The Lightning Project… part ten.

Posted: November 1, 2016 in Just Me
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My head having returned from SRM, was now ready to be fitted, and after a question asked in the competition section of BritBike forum, I equipped myself with some copper sealant, and a pair of small o-rings, so I was ready to go.

Barrel and gasket prepared and ready for the head to be fitted..

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Ready to go

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Returned head

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Copper seal and o-rings

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Coming together

And another unexpected bike joins the group.

The lightning seems to have taken up residence on the bench right now, the whole front end is out, the head is away at SRM having a full on valve job, I was hoping the head may have been completed this weekend but not so. As can happen sometimes, I managed to break a piston ring fitting the barrel, and the broken piece of course dropped into the crank cases, and could not be seen. But some fishing around with a telescopic magnet found it in the bottom of the cases. So after again fitting a spare ring to the piston, and some help from Paul, I managed to get the refinished barrels in place, bolted down.

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A65L new +20 pistons all fitted.

Next it was time to fit my new SRM magnetic sump kit, after removing the old studs I offered up the new gauze filter, only to find that it did not fit! it seems that SRM sent me out a kit for a B50 or other single, as the hole in the gauze was too small (8.5mm instead of 11.5mm) to go over the scavenger pipe. Luckily my old filter gauze was in very good condition, so I decided to use that rather than wait for a replacement from SRM.

Then it was just a case of bolting it all up to the underside of the motor.

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SRM magnetic sump

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It won’t stay shiny for long.

Vincent Comet…

I had a call from a mate in the US, telling me to go look over a Vincent Comet with a view to buying it, well a long story short, I did, and so I ended up with a Comet. I never thought I would ever own a Vincent, so getting this has come as a real surprise to me.

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Vincent Comet

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The Vincent

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Vincent 500cc single

Pulling it all apart, putting it all together.

I have now for the moment taken the motor as far apart as I intend to go for the time being. I have drained and flushed through the crank cases, and was pleased to find no metal in the drained oil after letting it stand in the tray for a week, and filtering it off over a strong magnet.

The cylinder head has gone off to SRM in Wales for full refurbishment, which includes lead free seats, new guides, valves, springs etc. This work wasn’t cheap by any means, but it should last me out, and make for a good top end. I am looking forward to getting the head back so I can button up the top end.

Last weekend I cleaned off all the old base gasket material, and fitted the new pistons, I also honed out and painted the barrels ready to be fitted. I would have fitted the barrels but the supplied base gasket in the kit I bought was for the 1/4″ stud version cases and not the 3/8″ as required on the later cases, so again I find myself waiting.

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New +20 pistons

Next I turned my attention to the front end and dropped out both fork legs, water had got in through the torn gaiters, and was evident in both legs, water came out of the right hand side, but the left hand stanchion is at the moment seized solid. So I have left it soaking in some penetrating oil for the week, I shall see how it does this weekend.

The Lightning Project… part six.

Posted: September 30, 2016 in Just Me
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SRM.

I just ordered and received this new SRM magnetic sump plate assembly for the BSA Lightning. The quality is outstanding as I hope you can see from the pictures.

I also sent my head off to SRM to have new valves, guides etc. It is right about now that I hope the bottom end is all ok! everything seems fine but I won’t know for sure until I fire the bike up. A scary thought.

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SRM sump kit.

http://www.srmclassicbikes.com

 

A couple of pictures from todays visit to my lockup, first up is the front wheel I picked up yesterday at Shepton jumble, as you can see the brake plate is nice, but the rim is shot, so I think I may well get a new rim fitted when I do the front end change.

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8″ twin leading shoe

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8″ brake plate

The Amal 930 carbs are to head for the ultrasonic tank, matched pair R41  L42

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Amal Mk1

And back at the last Kempton Jumble, I picked up a nice set of Craven Comet panniers, and an old rack that may well end up being fitted to the Lightning. or maybe they will go on my Guzzi, we shall see.

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Classic Craven Comet panniers

The next step is to remove the head, so we can check the condition of the combustion chamber, the valves, the bores, and of course the pistons. Somewhere in here is the reason for the low compression in the right hand cylinder, it is just a case of checking out the parts as you see them.

The valves seem fine, and have no leaking, so that really only leaves the piston or rings.

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Valves

Now we get the heart of the matter, the first look at the bores, and piston crowns, there was a fair bit of carbon build up, which I have started to clean off the pistons. There is slight scoring in the bores showing signs of previous trouble, a minor nip up, or a ring broken in the past.

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A65L barrels and pistons

The barrel just needs a light hone, and will be good to go, the piston crowns show +20 so there was a past problem hence the signs of previous scoring, and with the barrel removed we find the cause of low compression, the rings are all stuck solid in the right piston, nothing too major then.

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+20

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Stuck rings = low compression

Right time to strip and clean all the parts, hone the barrels, new piston kits, valves, valve guides etc, and start building it back up.

The Lightning Project… part three.

Posted: September 19, 2016 in Just Me
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Tank off, and deeper in to the mire we drift…

Original Lucas harness. This is a good sign to me, and I shall go through the connectors, and make sure the solder is good, and all the connections are cleaned and corrosion free before use, I may even put a new fuse board in the mix somewhere too.

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Lucas harness.

With the rocker cover off you get to see the pushrods and rocker gear, everything looks pretty tidy in here..

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Rocker assembly and pushrods

Remember where all the shims and springs go..

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Springs and things

You need to remove the exhaust rocker shaft to access the front head bolts, before removing the head. and the front top stud, so the head can clear the frame top tube. This is also a good time to remove the Amal carbs.

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Amal carbs ready to be removed