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Topics - Cmcl.1959

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1
Twins / A65 Rocket gearbox revisited
« on: 10 May, 2022, 09:46:34 »
Hi to everyone,

Just a quick question.
Does anyone know if it's possible to upload video to the forum?
The reason being that when I was at the bike last weekend I decided to record what was happening with the gearbox when the gear change problem occurs that has been happening.
It would be much clearer than the written explanation that I've tried to give.
I did try to add it as an attachment, but it wouldn't do it, I think because it's maybe too big memory wise.

Clarke

2
Twins / A65 Rocket timing marks
« on: 25 April, 2022, 10:36:01 »
Hi to all again,
As anyone who has seen my previous posts, I've been having a lot of trouble with gear selection.
In an effort to see if the gearbox was the issue, I removed the inner gearbox cover to give access to the cam plate.
Moving the back wheel, it's possible to select all the gears with the occasional false neutral between second and third.
I fitted the gear selector quadrant in the hole and operated it with the gear change lever and the plungers would work ok.
To do a dry run I re-fitted the gearbox cover and fitted the return spring mechanism and gear change lever, but it's back to missing gears and it feels like the plungers sometimes go more than one gear.
Anyway on taking the gear cover back off, the idler timing gear came off with it and in a moment of stupidity I tuned the engine over with it off to align the timing mark with that on the crankshaft gear and as a result the timing marks on the idler and camshaft no longer line up.
Can anyone advise on the best way to re-align the marks on all three. Can i for example leave the idler off and rotate the crank and camshaft gears separately to the correct positions and re-fit the idler? or is there a better way?
Any help gratefully received.
It's getting to the stage that I'll be happy if I can get the engine boxed up and running and leave the gear change issue to someone better qualified than me to sort it out.

Regards
Clarke

3
Twins / A65 Rocket gearbox
« on: 01 March, 2022, 14:04:38 »
Hi to all again.
A while back I tried to describe the pins in the timing side that limit the travel of the gear change return mechanism and it seemed to cause a bit of confusion.
I ended up copying the text from a service bulletin for the American market that highlighted the flats on these pins that dictate how far the return mechanism moves and how they should be sitting.
Most people that replied could not picture these pins as they were obviously not in their particular model of A65.
I was on Ebay today and found these pictures of the two different timing side cases.
Hope this shows what I was meaning. Both show the apertures for the kick start lever and also for the gear change lever. I'd imagine the one with just the one pin (where the return spring sits) is of a later design.


Regards
Clarke

4
Twins / A65 Rocket gearbox
« on: 15 December, 2021, 14:42:16 »
Hi to all again.
I'm still trying to resolve the gearchange issues I have coming down the box.
The gearbox will go from 3rd to 2nd, but will rarely go into neutral and most of the time won't go into 1st before coming to a standstill.
I've read the service bulletins and before I go to the extent of delving into the gearbox, one mentions the two stop "plugs" for the return lever. When I was fitting a new return spring I noticed that the flats on these are facing in the wrong direction i.e. away from the return lever.
Does anyone know if these are shrunk, glued or screwed in their holes so that I can try turning them. If they are shrunk in then to avoid damage, I'll either file new flats or as the service bulletin says grind a bit of the return lever arm. I'm not sure if it's possible to grind too much off.
In the meantime I've rebuilt the clutch with new friction plates. I ended up using the old plain plates as the ones I got from Draganfly didn't fit (they were the correct part no.). Also the new springs were also the correct number but were much longer than those fitted.
Any advice gratefully received.

Thanks
Clarke.

5
Twins / A65 Rocket gearbox
« on: 21 October, 2021, 18:42:04 »
Hi to all again,
I'm still in the process of updating my 1963/64 Rocket and so far have completed the change to 12V electrics, fitted a regulator/rectifier, changed the (damaged) alternator, fitted and set the Pazon electronic ignition and also fitted led bulbs.
I've also fitted a new Monobloc carb as the original had seen better days.
I'm still having gear change issues when running, namely the 4 speed box will change up pretty easily, but coming down it struggles to go from 3rd to 2nd and neutral is very difficult to find. When cold at stand still, shifting is better if I use my hand to operate the gear lever.
I've yet to strip down the clutch to see if that's where the gremlins are and there are signs that it is dragging, but if it is a gearbox issue, can anyone please advise me if any other models gearboxes will fit. I've seen a Thunderbolt one online in good condition, but I don't want to go spending cash on something that won't fit.
Any info gratefully received.

Thanks
Clarke

6
Twins / Amal Monobloc replacement
« on: 17 September, 2021, 18:25:16 »
Hello to all again,
I'm well into my plan to update my 1964 BSA A65 Rocket and so far I've fitted a new 12V alternator, regulator rectifier and electronic ignition.
I've turned my attention to the monobloc carb and on stripping it down, found it was black inside, wear on the slide and choke and despite being in the ultrasonic cleaner and changing all the jets etc I've come to the conclusion it's had its day.
I'm thinking of changing it to a concentric as it looks like there is a long waiting list at Amal.
I have a concentric from my Triumph days but I'm not sure what size would be compatible.
Any advice from anyone who has an A65 on a single concentric would be gratefully received. The monobloc is a 389/201.

Thanks
Clarke

7
Twins / A65 Rocket alternator change
« on: 26 August, 2021, 13:35:18 »
Hi to all again.
Continuing to upgrade my Rocket to 12v and electronic ignition.
Have found several issues on the way from previous work done on the bike, but biggest I think was that the alternator rotor had been rubbing on the stator for a long time and had damaged the stator.
Got the replacement today from Paul Goff (good service by the way) and went to fit it. Got my 8 thou all round, tied a piece of string to the old wires and pulled them through, tied on the new wires and found that the new sheathing is bigger and got stuck as i pulled it through and lo and behold the string came away.
I've tried pushing various things into the hole but cannot get anything to come through.
Can anyone advise me as to how to get the new wires through and where they exit near the left hand coil. Can it be seen with the chain guard off or am I in for a big job? Think I'll have to at least cut back the sheathing and fit smaller heat shrink tubing once I know how to get it through.

Thanks
Clarke

8
Twins / 1963 Rocket. Setting timing with Pazon
« on: 15 August, 2021, 16:04:47 »
Hello to everyone again,
As I said in previous topics, I have a !963 A65 Rocket and have been busy making mods to it to change it to 12Volt and to fit a Pazon electronic ignition system to it.
So far I've fitted the Areg one regulator/rectifier and completed the wiring for that. Today I finished the wiring on the Pazon system and am at the point of setting the timing.
To say I'm confused would be an understatement. I removed the tank and rocker cover so I could see the valve movements, took off the primary side cover and the timing side cover took out the old points etc. I rotated the engine until both valves were shut on cylinder 1.
My BSA instruction manual for the Rocket says the timing should be 37 degrees before TDC and suggests taking a rod, marking it at the rocker cover gasket at TDC then marking it again 0.357" further up, rotating the engine backwards and lining this mark up with the rocker cover gasket. This equates to just over 9mm back down the bore. I did this and then compared it by using a degree wheel on the end of the rotor shaft. This only gave me 18.5 degrees.
If I use the degree wheel to show 37 degrees the other method is miles out.
Does this have anything to do with the camshaft/crankshaft ratio?
Pazon also lists the timing point to be 34 degrees for all BSA twins but I think I'd go with the instruction manual figure.
So the big question for anyone that can help is which is correct, the degree wheel method or the timing stick one?
Many thanks in advance.

Clarke


9
Twins / A65 Rocket 1963/4
« on: 07 August, 2021, 21:19:26 »
Hi, has anyone fitted indicators to an early bike like this?
I donít see an issue with the front, fitting them to the headlight via the brackets, but thereís not much scope at the rear as far as I can see without making a bespoke bracket.
Anyone have any advice?


Thanks
Clarke

10
Twins / A65 Rocket conversion to 12V and Pazon ignition
« on: 22 July, 2021, 13:20:48 »
Hi to all again,
Some of the goodies I need to carry on with the 12v and electronic ignition have arrived and I'm keen to get going.
My bike I have discovered left the factory in December 1963 and as a result does not have the notch in the crank for the tool to set it at 34 degree BTDC. I have a dti which I'll use to find TDC on cylinder one and I've been trying to work out how far down the cylinder the piston sits at 34 degrees BTDC when I rotate the engine back. I have a copy of the owners' instruction manual from 1966 and it mentions using a rod with two marks on it (presumably one for TDC and the other for 34 degrees BTDC) and the distance down the bore will be 0.357" (9.0678mm). Is this right?
I plan to get a timing disk and attach it to the primary drive side (can anyone advise on the size of bolt needed to fit in the rotor nut), get my marks for TDC and fully advanced on the rotor and stator and strobe them once up and running but I thought I'd make a start while I'm waiting.
Looks like I was calculating it wrong as I was taking it as the crank turning through 180 degrees to move the piston the stroke of 74mm from BDC to TDC which gave me 0.4111mm/degree and 34 degrees would be 13.9778mm before TDC. Obviously got the wrong end of the stick.
Anyway if anyone can advise on the bolt size or the correct distance from the piston to TDC at 34 degrees it would be appreciated and ease a tired mind!


Thanks
Clarke

11
Twins / A65 Rocket 12v battery recommendation please
« on: 15 July, 2021, 10:11:11 »
Hi to all again,
I'm hoping to convert my 1964 Rocket from 6v to 12v and I would be grateful if anyone can recommend a suitable battery that will fit in the battery carrier.
My current Yuasa battery is 128mm x 60mm x 130mm but despite scouring the web most replacements seem to big. Has anyone done this conversion and found a suitable battery? I'm not sure how much clearance there is behind the side panel.
I'd ideally like not to have to modify the carrier so if anyone has some personal experience or advice it would be much appreciated.

Thanks
Clarke

12
Twins / A65 Rocket coils
« on: 09 July, 2021, 17:23:12 »
Hi,
I'm about to change my '64 Rocket to 12V and electronic ignition. The Pazon system says to use two 6V coils so I'm planning to use the ones that are already fitted to the bike.
Can anyone please tell me what values I should be looking for with resistance on the primary and secondary windings.
I'm getting the same value for each on the primary side, about 2.5, but very different figures for the secondary, about 13.5 on the right hand coil and 21 on the left.
If there's any doubt, I'll get new but if anyone can advise I'd be very grateful.

Clarke

13
Twins / A65 Rocket conversion to 12V
« on: 06 July, 2021, 08:05:24 »
Hi to all,
I'm new to the site and to BSA's. I previously had a 1972 OIF Triumph 650P which I bought from a dealer and was a bit of a disaster.
I had for about 4 years and had to do a lot of work to it to get it running and get it roadworthy. I sold it about three years ago and swore I wouldn't buy a bike again.
Anyway as all of you will know, once you have the bug....

So now I have a 1963 (65 reg.) 650 Rocket. I must say that the build quality compared to the Triumph seems much higher, quality of components etc.
I'm still getting used to the bike, but already have a list of things I want to do, a lot of which I did to the Triumph. Electronic ignition, indicators are high on the list.

Also I'm considering changing it to 12v as it's currently 6V. I've read articles on Paul Goff's site and it seems relatively easy, my only concern at the minute would be the original wiring loom. Will it be ok at 12V bearing in mind the age? Any advice gratefully received.

The bike takes a few kicks to get going and must be running rich as the plugs get sooty after a ride, not sure if I'll keep the choke. Didn't have one on the the Triumphs Concentric. The gearbox is ok but going down from 2nd to neutral or from 1st to neutral (must be one in there somewhere) makes stalling at the lights a usual occurrence. And those "oddie" side panel fixings! Twice I've had to keep a panel on with my leg. Didn't manage once and made a mess of the bonnie paintwork. I'll maybe change them for some screwed bar with dome nuts.

Like I say lots to do so I'll apologise now if I become a nuisance with lots of questions!

Regards
Clarke

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