SOHC.co.uk Forums > CB500/550
CB550F Double Disc's
Trigger:
Master cylinder Confusion.
I thought i would have a look at the masters on the bikes i have in at the moment.
1998 CB400 master states 7/8"
2011 GSX-R 750 master states 7/8"
2006 CBR 929RR master States 7/8"
Everything started to make sence until i looked at the Honda Blackbird, the master is stamped with 1/2". So had a look at the CB900F5, that stated 14mm.
Now all these bikes have twin pot, twin disc. So still no wiser.
Johnwebley:
--- Quote from: trigger6969 on April 17, 2014, 12:16:23 PM ---Just had a reply mail from Karl at DSS. The question was could they tell me the size of the Piston bore size on the aftermarket master cylinder for the GL1000 part number ect,ect. Karl replied with: Thank you for your email inquiry. Unfortunately we are waiting for new stock to arrive so cannot confirm at this time.
--- End quote ---
the M/C I got from DSS,has bore printed on the underside, 15.8 mm.
http://www.davidsilverspares.co.uk/GL1000K1-GOLDWING-1976/part_126547/
Trigger:
Cheers John, I think it is time to hit the pub because Honda state the replacement/ service kit is 17.5mm for the OEM master cylinder. Now are they talking about bore size or piston dia. I will drink my confusion away.
Trigger:
Yes Oddjob, Totally understand that bit. But those spec are not available unless you strip it down. Lost count of how many brake levers i have taken off to hear a couple of washer's drop on the floor. One time i found a nut wielded to the piston.
Trigger:
I think it is going to be a weekend of trying different Masters and using up my 5 ltr of fluid. Will try a 14mm bore and go up to a 7/8" which works out at round 22mm. Just to test the difference in travel.
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