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Tuatara (also other YB6?) Front brake Master Cylinder

 
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Spongebob



Joined: 03 May 2016
Posts: 130
Location: Oxfordshire

PostPosted: Sun Apr 14, 2019 3:41 pm    Post subject: Tuatara (also other YB6?) Front brake Master Cylinder Reply with quote

Anyone know what model Yamaha they robbed for the front brake master cylinder? Mine's seized solid and every model year of the FZR1000 seems to have a different part numbered master cylinder. The piston/seal/repair kits are all different part numbers too. There is no identification on it other that 8430 stamped on the side which doesnt align to any part number i can find.
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2bims



Joined: 03 Apr 2010
Posts: 6347

PostPosted: Sun Apr 14, 2019 5:46 pm    Post subject: Reply with quote

Have you tried looking in the spare parts manual for the part code number??Ö.Bimota didn't try to reinvent the wheel....if it was a Bimota specific part...it had a bimota specific code/part number...similarly if it was another manufacturer...be it Ducati etc...they "tried" to use the same part number that those manufacturers used.....
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Spongebob



Joined: 03 May 2016
Posts: 130
Location: Oxfordshire

PostPosted: Sun Apr 14, 2019 6:01 pm    Post subject: Reply with quote

Just been looking at Yamaha parts diagrams for different model years of the FZR1000. Itís very definitely a Yamaha part as it bears the legend YAMAHA across the lid. I have not looked at the Bimota parts books yet though.
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fish



Joined: 15 Mar 2010
Posts: 115
Location: australia

PostPosted: Mon Apr 15, 2019 12:08 am    Post subject: Reply with quote

Hi I would pull a part and measure bore size and go from there cheers craig
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DB1-DB2SR-DB2EF-DB3MANTRA-DB4 YB6-yb7_yb10-2xyb11-SB5,2xSB6-MILLE MIKEHAILWOOD 1000-HARRIS MAGMAN2-TRIUMPH T140-RG500x2-KAWA Z900-SUZUKI 1100KATANA-SUZUKI GSX1100-DUCATI 900SS- 750 sport ducati DUCATI F1 750- 900 boldor 1996 triumph trophy 1200
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who



Joined: 10 Nov 2010
Posts: 376
Location: Melbourne Australia

PostPosted: Wed Apr 17, 2019 10:08 am    Post subject: Reply with quote

1988 FZR1000.

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Spongebob



Joined: 03 May 2016
Posts: 130
Location: Oxfordshire

PostPosted: Wed Apr 17, 2019 10:58 am    Post subject: Reply with quote

Having got the thing apart the issue is the age of the fluid. Itís obviously absorbed water and turn crystalline particularly around the piston which has seized it solid. Iíve run all the parts through the ultrasonic cleaner and now rebuilt everything and itís working fine.

I might just fit a Brembo master cylinder I have in the SB6 hoard as the brakes are wooden and consign the original to my box of OEM parts to preserve originality if any future owners want that.
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who



Joined: 10 Nov 2010
Posts: 376
Location: Melbourne Australia

PostPosted: Wed Apr 17, 2019 11:25 am    Post subject: Reply with quote

They are not a great master-cylinder, always a bit spongy no matter how well rebuilt-bleed. Put a good one away for bike providence, but brembo, R6 R1 will pull you up better.
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Spongebob



Joined: 03 May 2016
Posts: 130
Location: Oxfordshire

PostPosted: Mon Apr 22, 2019 11:41 am    Post subject: Reply with quote

Brembo master cylinder fitted and bled. Nice firm lever and the reservoir is at the right angle. Now on to the next job of trying to work out why i have no neutral or oil light.
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