SOHC.co.uk Forums > CB500/550
CB550F Double Disc's
andy_c101:
Really interesting reading about 'which master cylinder' (I've been considering the same conversion for my 550K3.)
But I also have another question.
What is the solution for the speedo drive with the additional brake disk??
do you have to machine the original to fit? or is there a speedo drive off a different model that fits the twin disk mod?
Andy C
Trigger:
After some hours and circlip's pinging all over the place. As well as a load of emails to mate's that work in R&D for well known company's. The results were: If a master cylinder has 7/8" stamped on it. That would mean it is for a 7/8"=22mm handle bar fitting only :-[. Master cylinder's come in 4 standard sizes and on most modern bikes only 3 sizes are used and that excludes things like scooters.
1/2"=12.7mm Fitting ideal for rear brake caliper (single or twin pistons). Single front caliper (single or twin piston)
9/16"=14.28mm Fitting ideal for front twin calipers (single or twin pistons) General rule: production bikes over 250cc ( down to weight)
5/8"=15.8mm Fitting ideal for front twin calipers (single piston large capacity) and (multi small piston capacity)
11/16"=17.4625 Fitting ideal for front twin calipers (up to 6 pot double action caliper)
The orignal GL1000 master cylinder had a 11/16" bore but, was down sized to 5/8"
A common problem was found that not all master cylinders display a bore size.
Trigger:
I am working from this:
http://www.salocal.com/sohc/tech/dual_disks/dual_disks.htm
Johnwebley:
--- Quote from: trigger6969 on April 18, 2014, 09:48:43 PM ---I am working from this:
http://www.salocal.com/sohc/tech/dual_disks/dual_disks.htm
--- End quote ---
that explanation/advice is so good,I hadn't found that,but its almost 100% what I ended up doing,
Trigger:
John, What do you mean, nearly 100%?
I went with this guys advice because it was straight forward advice and the rest had turned there explaining into a book.
This link also says, No mod to the speedo drive.
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