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Disk replacement for Yamaha 82 Seca 750

Discussion in 'XJ Technical Chat' started by HeckticHaze, May 19, 2019.

  1. HeckticHaze

    HeckticHaze Member

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    Has anyone used an EBC disk (P/N: VMD2023LS &RS) to replace the factory part? My right disk is warped. I also have to do a caliper rebuild and potentially a master cylinder rebuild. I was just curious if there was any installation or operational issues. Has anyone put a procedure together on this technical chat area to replace disks on the Seca's?
     
    HeckticHaze, May 19, 2019
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  2. HeckticHaze

    HeckticHaze Member

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    Well, it is looking like no one has tried the EBC disks out. Can you still purchase the OEM part? If you have to replace a disk on a motorcycle do you have to replace both sides not just the damaged side? There seems to be a safety washer on each bolt holding the rotor in place. Can they be reused?
     
    HeckticHaze, Jun 8, 2019
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  3. Toomanybikes

    Toomanybikes Well-Known Member

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    Used ones are plentiful and replacing just one is acceptable. The lock tab can be reused if removed carefully. There is a member near you that should have one for you. His name is @hogfiddles in Hubbardsville . He’s doing the NY carb clinic this weekend so he may not answer right away.
     
    Toomanybikes, Jun 8, 2019
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  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    I have read of people who used the EBC discs, but I don't think any of them are active members anymore. I can't speak to the correct part number for them.
     
    k-moe, Jun 8, 2019
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  5. mlew

    mlew Well-Known Member

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    I have EBC rotors on my XJ11. They were a direct fit with no modifications needed. Braking is nice and smooth now.
    Len provided them for the Vintage Yamaha rally a few years ago and I got them.
     
    mlew, Jun 8, 2019
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  6. Polock

    Polock Well-Known Member

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    i put a EBC disk on the back of my bmw and it seems to get surface rust faster than the front oem ones. that might be a problem on a dual setup
     
    Polock, Jun 8, 2019
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  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    if you go with the EBC rotor you will want to replace both sides.

    oem used 60 to 70$ ebay for a set
     
    XJ550H, Jun 8, 2019
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  8. HeckticHaze

    HeckticHaze Member

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    Thank you for the information. I think I am going to look for a used OEM disk. Hopefully in better shape then mine.
     
    HeckticHaze, Jun 9, 2019
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  9. XJ550H

    XJ550H Well-Known Member Premium Member

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    ebay has many sets
     
    XJ550H, Jun 9, 2019
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  10. HeckticHaze

    HeckticHaze Member

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    Question, rebuilding calipers. The red paste that comes with the seal kit are you supposed to spread that on the outer portion of the piston or just a little on the seals? Will this paste contaminate the dot 3 brake fluid I put in the system? Should I be able to insert the piston by hand or do you need a c-clamp to seat it in place?
     
    HeckticHaze, Jul 1, 2019
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  11. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The red grease is fot the seals so they don't tear when you install the piston. It is compatible with all glycol-based brake fluids.

    The piston should be able to be started by hand, and you might need a c-clamp (depends on the temperature when you're working IMO), but make darned sure that the piston is in the bore straight.
     
    k-moe, Jul 1, 2019
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  12. HeckticHaze

    HeckticHaze Member

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    K-moe thanks for the reply. I have parts on the way from Chacal. I have to install new caliper pistons. The originals are pretty pitted up. I am hoping this fixes the binding problem on the right rotor. If not, I'll be looking at the master cylinder next.
     
    HeckticHaze, Jul 2, 2019
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  13. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Unless you have owned he bike long enough to know when the master cylinder was last rebuilt, it's best to do the whole system at once.
    Yamaha specified a 4 year line and seal replacement schedule for the OEM parts.
     
    k-moe, Jul 2, 2019
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