Hi to all,
Can anyone please help me regarding gear change quadrants for my 1965 A65Rocket.
I've posted several times about the issues I have with changing down the box from 3rd to 2nd and neutral. My friend helped me put videos on YouTube showing the issues and the different steps I tried including changing the return spring etc.
The original quadrant which came with the bike had knackered splines and I'd like to take it out and send it away for repair. I have managed to get a replacement but it looks slightly different, namely the casting that holds the plungers is not chamfered.
It is shown in the parts book from 1965 as being correct and is listed as 68-3098.
Does anyone know why it's different? Is it from a different model perhaps, but mostly will it work as a replacement. To be honest I don't think it could be any worse.
Hopefully the photo I have attached will show the difference.
Anyway, any information gratefully received.
Thanks
Clarke
It's difficult to see the difference from end on - any chance of a side view of both quadrants? Any chamfering is likely to be there to provide clearance as the quadrant is rotated, possibly with part of the casting inside of the inner timing cover. If you fit the quadrant, it is worth checking that you can get full quadrant movement between the two stops without any clearance isues.
Hi Spaceman,
This is the best I've got as the original is still in the bike.
There is a gear quadrant for sale on eBay from America that shows the chamfering so I don't think it was a one off done by an owner, and another from Germany like the one that I want to put in.
Clarke
Hi,
I would say that the one with the chamfer is a bit 'beefier' and therefore needing the chamfer.
Dave.
Hi Dave,
My research has also shown that there are differences with the small plate and screw that retains the plungers.
In the parts list they are shown as a flat plate and small countersunk screw ( no longer available from Draganfly ) but I went onto SRM website and they have thin metal plates, bent over at the edges an a bigger flat headed screw. These can be seen on the eBay one advertised on eBay.
I think I'll make a new plate from a bit of stock and stick with the 5ba countersink head screw.
Nightmare.
Clarke
As said, I think the chamfer must be there to provide a bit of clearance at either end of the quadrant gear change movement. You would have to try it with the inner timing cover off to see why it was needed.
Last year I helped another member with a problem he had with a similar quadrant which suffered from one of the plungers projecting too far and jamming the camplate. His retaining plate was in very poor condition contributing to the problem so it is worth checking the plunger set up with any new plate you make.
Thanks.
Will do.
The C15 quadrant retaining plate I played around with was basically a thin rectangular piece of metal with the ends slightly turned through 90 degs - these turned down ends is what retains the plungers. The C15 retaining plate was held in position by a round flat headed screw (40-3143) with orthogonal slots for a screw driver.
Between at least 1964-67, the A65 used a thicker flat retaining plate (68-3097) without turned down ends but used the same screw (40-3143). From my experience, the thin retaining plate used on the C15 was not really up to the job and the thicker A65 plate is more sensible. As said, its best to check the plungers protrude the correct distance and to also make sure the screw can't undo either via centre punching or or by using a Loctite retaining fluid.
Thanks for this.
Is there a specific amount the plungers need to protrude?
Clarke