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Topics - AdrianS

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Twins / Oil tank removal
« on: 28 November, 2020, 17:00:59 »
Iím trying to get the oil tank out from my 1962 A50, to thoroughly clean the inside.
Is there an easy way to get it out or have I got to dismantle the rear end of the bike to get it out?
Failing that, whatís the easiest way to clean out the tank if I leave it in place?

Twins / Clutch and valve springs
« on: 25 November, 2020, 17:09:58 »
I am rebuilding my early A50 and going through the parts to put together a shopping list.

Is it wise to replace all the valve springs and clutch springs as a matter of course?

My valve springs are within 5% of the specified lengths apart from 1 outer which is about 10% out.
The clutch springs I probably will change as the existing ones are about 38mm long and new ones are 44mm long ( 4 spring early clutch)

What are the accepted tolerances for spring wear generally.

Twins / A50 timing cover gasket
« on: 21 November, 2020, 08:18:20 »
Just a quick question..
Are all the timing cover gaskets interchangeable?
Iíve got my A50 engine in bits (to have the timing side bush done) and found a pack of various gaskets with an A65 copper head gasket. There is a timing cover gasket in the pack but there is no more on the pack as to what bike it is for. I note there are several thicknesses available

Twins / Impact wrench
« on: 14 November, 2020, 21:23:04 »
Whatís the thinking about using an impact air wrench to undo tight nuts?
Thinking about crank nuts and clutch / gearbox nuts without having to put a bar through the con rod little ends.

Twins / assessing piston wear
« on: 11 November, 2020, 12:16:37 »
I've got my head of the A50.
At TDC there is quite a bit of movement when I move the tops of the pistons but at the bottom of the barrel the pistons are quite firm with little movement. The bore looks good and with my calipers measures 65.5 to 65.65 across the bore so am assuming it is still standard bore.
One valve guide ( left exhaust ) is quite worn and will need replacing but otherwise all looks OK.

Twins / Oil leak
« on: 09 October, 2020, 13:10:28 »
Hi all,

Just an observation.
I am about to start stripping my A50 engine in the frame to find the source of some unexplained noises.
I previously changed my oil pipes to the later ones with the direct feed to the rocker gear. Since doing that, every time I park the bike on its side stand after a run, I get a substantial leak from the left head barrel joint. If the bike is on the centre stand this doesnít happen. I assume the new feed is putting a lot more oil into the rocker box and when parked up it is draining possibly down a head bolt and the gasket is not sealing well. Never had this with the old oil supply!

Twins / Split metering pin
« on: 30 September, 2020, 17:23:11 »
In preparation for my engine strip, the WSM mentions a split metering pin in the oil supply to the rockers.
I have searched and cannot find any diagrams of it or description other than calling it a split metering pin.
Can anyone enlighten me and explain how to check or replace it or is it patently obvious when I start to dismantle?

Twins / Cylinder base nut size
« on: 24 September, 2020, 13:57:57 »
Hi all
I need to get a new set of cylinder barrel base nuts for my early a50.
Struggling to find the size of them as I believe they changed over the years.
Can anyone let me know and also is there anything ďspecialĒ about these nuts or can any of the correct size be used.

Twins / A 50 inner timing cover
« on: 18 September, 2020, 16:37:14 »
Just a quick question;

Can the inner timing cover be removed without draining the oil tank?

Also, are the timing gears prone to wear?

Twins / A50 alternator stator
« on: 17 September, 2020, 09:58:52 »
I pulled the alternator stator of the studs to fit a new chain tensioning pad.
It was very tight on the mounting studs.
When replacing it, I could only get about 3-5 thou of clearance at one point between the rotor and stator.
Question is; can I drill out slightly the stator holes to give a tiny bit more play to adjust its position to get an even gap around the rotor?
If so, I would have to remove the stator completely; the cable goes through a grommet inside the casing, where do I disconnect the wiring as not had it off before?
( I am wondering if the rotor is catching the stator a little contributing to some of the noises I can hear).

Cheers for any replies.

Twins / A50 head gasket
« on: 05 September, 2020, 18:34:30 »
In preparation for my engine strip, I will need a new head gasket. I believe the early engines had a composite gasket and later ones had a solid copper gasket which could be re annealed.
Can either gasket be used? I havenít a clue what is on the engine at the mo, but with oil weeping out of the head joint somewhere I suspect it is a composite gasket.

Twins / A50 engine rebuild
« on: 02 September, 2020, 07:55:35 »
Had some niggles with the engine- bottom end noise which I feel is the timing side bush, oil leak from head gasket area and one or two other niggles
Iíve rebuilt bantam and c15 engines before but not tackled a twin.
Any specific difficulties or problems I may encounter? Apart from a clutch puller and a few other pullers are any other special tools required?
The engine I believe is heavy so is it best to do most disassembly and reassembly in the frame or get the whole lump out?
Looking forward to my winter project!!

Twins / A50 clutch puller
« on: 14 August, 2020, 17:12:04 »
I am going to renew my primary chain on my A50 in the hope of curing what sounds like Tappet rattle from the chaincase.
A couple of questions:
1. It is an early A50 (62/63) - what size clutch puller do I need. I believe there are several different pullers.

2. Is there anything in the clutch that can cause a rattle or I should replace? There is a small amount of play when I rock the clutch but not what I would call excessive.

3. The sprockets look very good so hopefully I wont have to renew them but will fit a new tensioner blade.

Singles / B40 Silencer
« on: 14 July, 2020, 19:08:19 »
Can anyone recommend a good pattern silencer that is not tooooo loud!!
I rebuilt my B40 a couple of years ago and bought a silencer from one of the usual dealers but it is very loud.
I've tried to put up with it but feel it needs changing. Tried one of those moderators stuck up the end of it and it made minimal difference.
The original silencer sounded really good but was past salvation.

Twins / A50 air filter
« on: 22 June, 2020, 17:48:46 »
Can anyone tell me if the early A50 ( 1962) had an air cleaner fitted?
If so, what type was it?
My bike just has a bell mouth perforated filter on the mono bloc.
Just wondered as the jetting may be a bit out if a filter should be fitted.

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