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Messages - chaterlea25

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1
British Bikes / Re: BSA B31 Rigid (1949)
« on: September 23, 2026, 09:18:47 PM »
Hi RW,
I'll bet that the clutch centre "hub" that sits on the taper has cracked along the edge of the keyway or that it is binding on the sliding plate
A better method in my opinion of setting up the pressure plate lift is to measure the plate lift near each of the spring nuts using a dial gauge. These clutches do not run very true as they are all well worn by now, so trueing the pressure plate gives a false set up

John

2
British Bikes / Re: Troubleshooting a JAP Special
« on: August 20, 2026, 11:52:36 PM »
Hi,
Looking at the photos of the clutch centre hub it can be seen that the splines have been ground away, this is why the clutch is getting so close to the final drive chain!
It may have been a bodge to get the primary chain lined up to the engine ??

John

3
British Bikes / Re: A Tale of Two Gearboxes
« on: April 13, 2026, 11:32:23 PM »
Hi Ramwing,
Yes the pressure required to fit the fixed gears to main and layshaft varies just as you have found
Only thos evening I was changing a layshaft gear to another shaft, luckily they were not too difficult

John

4
British Bikes / Re: BSA B31 Timing Inner Cover
« on: March 30, 2026, 01:01:05 AM »
Hi,
I havn't bee on here for a while so apologies
Get the relavent BSA service sheets first of all
To get the inner gearbox (not timing) cover off You will have to strip down the clutch side and remove the clutch centre adaptor. This requires a threaded puller.
Once that is off then the complete gear cluster, minus the high speed gear will slide out once the screws are removed.
Taking the speedo drive and layshaft apart is a bit chicken and egg
Once the retaining pin is removed, then the spindle bush must be pulled up and out and then the drive spindle removed before the layshaft will release from its bearing bush.

Its been a while since I had on on the bench ? so I am trying to remember if its possible to remove the inner cover and leave the innards in place by removing the kickstart ratchet mechanism?
My method of assembly is to fit everything to the inner plate and slide the complete cluster into place.
Any excess end float in the shafts or selector drum will cause mayham!!!
Shimming has to be done very carefully in order for the sliding dogs not to get too close to the gears that are not in play or in neutral.. Having the box fixed on a bench vice with the rear cover removed is best.
The linkage pins and ratchet gearchange claws must not have any wear and it is a delicate balance to get every thing correct.. 
A friend was knocked off his plunger B31 and bent the gear lever a touch, but it must have distorted something, as it would not select third-top
I spent hours and days swopping bits about and still unsure how it finally came right.. Theres very little in the books on how to "" fix these buggers" when problems arise

https://draganfly.co.uk/product-category/bsa/sparesparts-for-bsa-a710-b3133-c101112-m202133/engine-
gaskets-gearbox/gearbox-abcm/b-m-group-1938-62-plunger-rigid/

John

5
British Bikes / Re: Help identifying a petrol tank
« on: December 25, 2025, 12:50:52 AM »
Hi All
The B and  C (speedo in) tanks are much more pointed at the rear

John

6
British Bikes / Re: Help identifying a petrol tank
« on: November 09, 2025, 07:05:29 PM »
Hi All,
I'm fairly sure its from a 1947/48 BSA A7

https://www.flickr.com/photos/booth15143/4649186505


John

7
British Bikes / Re: AJS 16M 1951
« on: July 26, 2025, 12:52:32 AM »
Hi All
When the outer cover is taken off the indent plunger and spring behind the selector drum pushes the drum outwards so partially engaging a gear inside the box hence the clicking !! It will be ok when the cover is put back on..
Make sure the ratchet gear on the gearbox shaft is working correctly and not worn out or broken.

John


8
British Bikes / Re: Troubleshooting a JAP Special
« on: April 13, 2025, 01:01:40 AM »
Hi RB
On some J.A.P ohv's the rockers are held in place by cast on "pip's" on the outer cover.  In your photos I can see the protrusions on the rockers that would sit against the cover pips.
It looks wrong when you take the cover off and the rockers can push /pull , but is fine when the outer cover is fitted

John

9
British Bikes / Re: A10 front brake cables
« on: April 13, 2025, 12:51:44 AM »
HI RGS,
The dimensions of my cable wouldnt be much good to you , as I have non standard handlebar levers and home made clevis on the brake arm.
I think your best option is to find somebody to bring the bike to and can make up a cable for you??
Or, buy a universal cable to work out the lengths from, then get the cable made by JJ cables or the like

John

10
British Bikes / Re: A10 front brake cables
« on: April 01, 2025, 08:45:29 PM »
Hi John,
I would say its different ?
Mine is home made  ::)

John

11
Japanese Bikes / Re: Marusho Lilac Le Mans
« on: January 12, 2025, 05:52:37 PM »
Hi 33D6,
Thanks for the reply and update
He is on the case

John

12
Japanese Bikes / Re: Marusho Lilac Le Mans
« on: December 31, 2024, 07:42:23 PM »
Hi 33d6,
I have been contacted by a fellow BSA A10 Forum member who also has a Lilac
He wants to make contact with you regarding registration details of his model
I sent you a PM some while ago but not had an acknowledgement or neither has the Lilac owner
I am sending you a further PM with "Col's" email and phone number

Happy new Year
John

13
British Bikes / Re: James ML with no spark
« on: December 16, 2024, 11:28:08 PM »
Hi,
That is correct the low tension winding is grounded at both ends, one permanently and the other through the points..
If you remove the wire to the coil you can test the contact breaker , one side should not be grounded when the points are open.
The magnetism creates a current in the closed loop of the primary coil, when the points open the magnetic field collapses
the change in the magnetic field creates the high voltage to spark the plug

John

14
Autojumble / Re: 1937 J A P 500cc bearing cage wanted
« on: July 05, 2024, 09:54:54 PM »
Hi
I know this is an old post but,
Have you tried Speedway Services (UK)

John

15
British Bikes / Re: royal enfield 355 1929
« on: March 11, 2024, 10:20:03 PM »
Hi Geoff and All,
I have only just now caught up with your posts
I have a fair amount of experience on the AMAC MDY carbs
These have a tapered neele just the same as later Amals,  so after starting the bike you should open the air (choke) slide fully, (tight cable)  and use the long lever just as you would a twistgrip
Most often there is no need to use the choke (air) lever just press the tickler until fuel starts to drip from the chamber top or bellmouth .
Did you remove the jet block from the carb body and clear the tiny pilot mixture drilling's ,
There is no separate pilot jet just the drilled holes, the drilling's in the block line up with others in the carb body exiting at the engine side of the throttle slide.
Not having a throttle stop on these carbs tickover must be set with the cable adjuster
This alters the speed of the engine as the handlebar is turned which can be a pain
A solution is to use the special outer cable as used on modern bicycle gear changes, this is wound on a long spiral to prevent the overall length changing  as the handlebar is turned.
I have the AMAC instruction book on PDF which I can share with you if you need it

John

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