Double disc conversion

[Sesman]

Help please. Almost completed the DD conversion, however have encountered a slight problem. I elected to use the asymmetrical set up, but of course I now need a longer caliper arm spring and adjuster screw. I can preload the spring using washers or a short spacer, but the screw will be too short. Iv’e not noticed mention of this in the articles I’ve read. Is a ready made alternative available,or,do I get one made?

Thanks in anticipation.

[Sesman]

Scrub that, just reread part 2 of the Blacksquare Article. 

[Sesman]

Shim the spring and place the locknut on the inner fork side. Not a pleasant solution, but effective. In the long term I’ll get a mate to run me up a special, longer item.

[Trigger]

Just buy a countersunk machine screw. Link >>> http://www.sohc.co.uk/index.php/topic,20419.135.html

[Trigger]

It has been more than a week now so, can not remember. Just look on ebay for stainless compression springs that you can give all the measurements 

[Sesman]

Cheers trigger. On it…

[Sesman]

Will do. Found a supplier, just need to get the ruler out…

[Trigger]

Mines still locked up in the garage around the corner Sesman, I presume you'll measure the OE spring length and wire diameter etc. If so can you let me know what it is, I can find some springs but don't want to buy any until I know it will work.

BTW, found some stainless springs that will do for the rear brake rod, saves them rusting in the future, I had mine chromed but of course they don't last that long and rust on the interior part of the coils.

You need the diameter of the wire, outside diameter of the spring and it has to be longer.  I mounted the caliper and then measured the distance and put on 5 to 10mm or more 

[Sesman]

Exactly my pal, thanks trigger

[Sesman]

“Plan”, not “pal”. But happy to be your pal.

[Yoshi823]

Shim the spring and place the locknut on the inner fork side. Not a pleasant solution, but effective. In the long term I’ll get a mate to run me up a special, longer item.

I did that shown in the pic back in 1981 on my commuter CB550F1. When I sold the bike I transposed the double discs to my wife's CB550F2

[Bro550F]

Maybe it's been asked before, but obviously with a twin disc conversion we're looking for better stopping power. Well has anyone changed the master cylinder for a more modern one ??

[Johnwebley]

Maybe it's been asked before, but obviously with a twin disc conversion we're looking for better stopping power. Well has anyone changed the master cylinder for a more modern one ??

  you normally change the MC for one from an early goldwing,

 they look the same,but have a larger bore to suit twin calipers.

 commenting on the spring issue,

  I left out the springs ages ago,they are not needed,

and a countersunk  screw should be available at any good engineering store,

[Bryanj]

If you use the see through GL 1000 one you get a micro switch for brake light and canput the second caliper hose where the hydraulic switch goes

[Sesman]

Hi, Oddjob.

No, but have found a supplier. I’ll  post next week as currently charging through France.