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Messages - chaterlea25

Pages: [1] 2 3 ... 25
1
British Bikes / Re: 6 VOLT COIL RESISTANCE
« on: May 10, 2019, 11:07:06 PM »
Hi W
The values sound good to me
10-11 k is usually a modern electronic ignition coil value

John

2
British Bikes / Re: JAP 750 v twin ,type MTS
« on: May 10, 2019, 11:04:33 PM »
Hi John.K
What is the housing depth, maximum bearing width? and ideal bearing O/D ?

I recently got some NOS bearings and there are some likely looking bearings for such an application in there
I have not measured up what actual size they are or cleaned off the protective grease to see any numbers

Last year I rebuilt a HD model F engine, I machined a metric double row self aligning bearing (52 x25) to imperial
2in. x1in.dimensions, rather than to wait another month for bits and then try and sort out roller sets to 0.0001 to make it work  :o
I read an article that mentioned the early racing engines used the self aligning bearing
I posted a bit about the job here
https://madmodder.net/index.php/topic,12588.msg149940.html#msg149940

John


3
British Bikes / Re: Gold Star Speedo drive gear
« on: May 05, 2019, 10:27:03 PM »
Hi Bigjos
I have found one or two that resist removal
Having the layshaft out of the gearbox helps, grip the dead spiral in a vice and try and turn the shaft with an adjustable spanner or more serious weapon
I had to drill the stub of one out of the shaft after chopping the mangled end off
That looks like a STD box with bushed layshaft??

The kickstart stop needs repair on the box in the photo
Link to how I repaired a badly damaged stop
https://www.a7a10.net/forum/index.php?topic=2914.msg19637#msg19637

John



4
Identify these bikes! / Re: Help Identifying bike from 1919 photo
« on: March 31, 2019, 08:40:29 PM »
Hi Matt and Rex

Its a Triumph model H, 
Something a bit odd about the front wheel setup though?
The stirrup front brake assembly is not present ?
There are two disc like gadgets on the front hub that are "strange" to my eye ???

John

5
British Bikes / Re: BSA Gold Star oil return
« on: March 23, 2019, 10:15:25 PM »
Hi Bigjos,
The crankcase should be marked which is return, the outside one

A problem with all BSA pre unit singles is that the oil pumps can and do tighten up (seize) when bolted back into the engines, The casualty of the pump tightening up is the worm drive which will strip the teeth
Make sure the pump and its drive parts are OK before going any further
The pump may appear free when not fitted but tighten up when bolted in place
Fit a pair of 1/4 x 20 nuts to the pump fixing bolts and tighten them to simulate the pump being fitted to the engine
and make sure it turns easily

Did you prime the engine oil ways and oil pipes before you started the engine? This is important to do
Was the engine standing for a long time before you went to start it?

John



6
British Bikes / Re: Fitting Wassel negative earth regulator
« on: March 18, 2019, 08:42:40 PM »
Hi Ian,
That's the Bosch and Autolite way of doing things  ::)

John

7
British Bikes / Re: Fitting Wassel negative earth regulator
« on: March 17, 2019, 02:17:23 PM »
Hi Ian and Paul
The connections required for the wassel are not standard Lucas
so need to be changed as explained earlier

John

8
British Bikes / Re: Fitting Wassel negative earth regulator
« on: March 16, 2019, 07:35:42 PM »
Hi Paul
As I tried to explain the problem lies with the idiot who did the drawing  ::)
It shows two little square boxes, one with D inside, this is a terminal on the dynamo
the box with F inside it represents the field coil
So one side of the field coil is connected to the D terminal ( the + brush and the yellow wire to the regulator also attach to D)
The other field coil wire goes straight to the F terminal where the green wire to the regulator also connects

Take a pen and draw a spiral across the F inside the box from one wire to the other, to represent the field coil

John

9
British Bikes / Re: T 100 oil feed return problem
« on: March 15, 2019, 08:11:31 PM »
Hi Ian
Thanks for the link Ian

John

10
British Bikes / Re: T 100 oil feed return problem
« on: March 14, 2019, 11:28:29 PM »
Hi Rex
When belts are mismatched they can set up horrible chatter and vibration
Matched sets of belts are expensive,
I would think that my lathe belts were the originals but have no way of knowing

John

11
British Bikes / Re: Fitting Wassel negative earth regulator
« on: March 14, 2019, 09:43:13 PM »
Hi Paul,

Quote
Connections inside the Dynamo
According to the first page I need to change the field coil connections by connecting the positive field connection to Terminal D
Terminal D should already have a connection to the positive brush
The other field coil wire (-ve) is moved to Terminal F
The negative brush is connected to the dynamo body

Yes correct  ;D

There are two ways that the field current is switched on and off to achieve regulation
Lucas and some others have one end of the field coil earthed, and "feed" the field coil from the battery live

Bosch and some American regulators and the Wassel  fix one end of the field to the live side of the battery/dynamo
and the regulator switches the connection to earth (chassis, or battery neg in your case)
JG conversion regulators also work like this
This setup makes polarising the field coil a bit more awkward,
You need to earth the F connection (-), Lift the live dynamo brush from the commutator (or disconnect the Field coil positive end and take a wire from the battery positive and spark it to the end of the field coil (+)

Current to the field is not "regulated" in a variable way simply switched on and off as the voltage falls and rises to the setting parameters of the regulator

John

12
British Bikes / Re: T 100 oil feed return problem
« on: March 14, 2019, 09:17:32 PM »
Hi Rex,
I often wondered how they found out that the rings rotated unless they did multiple assemblies and dismantling?

When I served my time another thing I was told when removing electric motors for repair that had multiple belts on the drive was to mark each belt so they would be replaced in the positions and locations that they were removed and have the same alignment
A while ago I did this when I rebuilt the motor on my lathe (4 belts)
After the first run the alignment marks had all moved by a considerable amount and the marks continued to drift all over the place   ::)

John

13
British Bikes / Re: T 100 oil feed return problem
« on: March 13, 2019, 08:47:02 PM »
Hi All,
Recent thinking is that the rings rotate on the pistons as the engine runs, so does it matter where you place them?
I was shown / told to place the ring gaps on the on thrust areas, ie to the sides towards the gudgeon pin
many many years ago ::)

John

14
British Bikes / Re: Fitting Wassel negative earth regulator
« on: March 13, 2019, 08:40:07 PM »
Hi Paul,
Agreed its a bit confusing the way its shown
in diagram 2 neg earth they do not include a reasonable field winding symbol only a little square with F inside it
They use the same symbol for terminals ??

So
Connect one end of the field winding to D terminal also goes to positive brush
The other field winding goes to the F terminal
The negative brush is connected to the dynamo body
Test for correct rotation by
Connect a wire from the F terminal to the dynamo body, and then to a battery negative
Connect a wire from the D terminal to the battery positive
The dynamo should run as a motor in the same direction as it is driven on the bike
If it motors in the wrong direction swop over the field winding connections
This test should be enough to polarise the dynanmo

John

15
Autojumble / Re: 350 cc side valve JAP engine parts needed
« on: March 04, 2019, 11:07:18 PM »
Hi Mobike,
A manual advance magneto would give better performance than the fixed wico
Lawnmower engines tend to be run at one speed so fixed ignition works
A rotating coil mag would be better running at half engine speed too, high revs can damage them
Be careful trying to unscrew the inlet pipe, the one on my sv and others I have seen are Left hand thread
I do not know why this is ???? and cannot see a reason why???

John

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