SOHC.co.uk Forums > CB500/550
CB550F Double Disc's
Trigger:
Right, just buzzed round a few forums and found a member that has just bought a aftermarket master for a GL1000K1 from DSS. He says that the master piston is 14mm. Had a quick look on DSS at the aftermarket master for a CB550 and the write up states that the replacement sohc master is also 14mm. Defiantly need to do some maths on this one.
John, you are right on the dia X volume but, i am thinking what would one need for a twin caliper set up? In the way of master piston dia.
Johnwebley:
--- Quote from: trigger6969 on April 15, 2014, 11:31:50 PM ---Right, just buzzed round a few forums and found a member that has just bought a aftermarket master for a GL1000K1 from DSS. He says that the master piston is 14mm. Had a quick look on DSS at the aftermarket master for a CB550 and the write up states that the replacement sohc master is also 14mm. Defiantly need to do some maths on this one.
John, you are right on the dia X volume but, i am thinking what would one need for a twin caliper set up? In the way of master piston dia.
--- End quote ---
I fitted a second disc to my CB500-4,using a standard caliper,and a GL1000 mastercylinder,,the feel is great,lever travel is as standard
with single disc,
and the GL1000 looks exactly the same as standard CB500
LesterPiglet:
If you look at Silvers the 550 and Wing master cylinders are the same.
Bryanj:
The first Wing had a master that looked identical to the 500 but had a bigger bore and the later ones had the clear, tall reervoir with a bigger bore ---I know for serpant as i got both in bits in my tool box!! No they ain't for sale, one of these days i am building a 605 with flowed head and big cam so will need the twin discs.
Many years ago when Girling still made things the started a range of japanese brake parts and i bought an early wing one, in my opinion it was a cosmetic reject from japan as the mirror boss flange had a slight dink that was anodised over
Trigger:
Cheers for the input lads. It is all getting very interesting. After a few emails to part suppliers in the sates late last night and some Japanese this morning . Parts suppliers have stated that a master cylinder repair/service kit for a OEM, GL1000 has a 17.5 bore on the piston (well over engineered and could push any caliper piston) but, they all sell aftermarket replacement masters for the GL, 1973-1975 with a 14mm piston in the master.
Mailed DSS and asked what is the bore size on his aftermarket master for the GL 1000, lets see if it is different than the CB550.
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