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Help Rear master cylinder banjo bolt pitch

Discussion in 'Yamaha 250cc In-Line 4's' started by Dropdead53, Mar 3, 2020.

  1. Dropdead53

    Dropdead53 Active Member

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    Hey guys, does anyone know what the thread size and pitch would be on the rear master cylinder banjo bolt on my 3ln1?? From what I can gather, it is either M10 x 1 or M10 x 1.25 pitch.
    I’m going to put rearsets on my bike, however the rearsets dont have provision for a brake switch, so I need to fit an in-line pressure brake light switch to operate the brake light. See picture attached.
    Thanks
    3E63D53F-AA30-4767-9EF9-DBA7F9A610AC.png
     
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    All the Japanese ones I have seen are 10 x 1.25. Italian Brembo are 10 x 1.0.
     
  3. Dropdead53

    Dropdead53 Active Member

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    Thank you
     
  4. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Out of interest, which rearsets - I browsed the various one on ebay and aliexpress for quite some time, but asking the sellers what the bolt hole spacing was ended up being a futile exercise
     
  5. Dropdead53

    Dropdead53 Active Member

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    I had messaged a few different companies as well, (race supplies direct, woodcraft ect) and no one would give me the mounting measurements for the mountings points. So from asking a few different people, some of them said they were running fzr400 rearsets. So basically I just went out on a whim and bought a set of fzr400 rearsets from race supplies direct off eBay (see picture).
    -If they fit, GREAT!
    - if they don’t fit, I will try and modify them to make them fit or I might have to make an adapter plate to make them fit.
    - if they REALLY don’t fit and are never going to work, then worse case, I will just try and sell them on and get some money back and at least I tried!!
    Then I will continue on the never ending journey of trying to find rearsets that fit an fzr250.


    6BBC3C7D-6EE9-4618-B727-64F2626D3207.png
     
  6. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    @maelstrom may be able to give you the bolt spacing on those at least as he has an FZR400 - there are others here who may also be able to assist with measurements

    I had something like these bookmarked - now checking back over my searches I had bookmarks for GSXR1000 rearsets from 2000-2004 and 2005-2006 - long time ago so I cannot recall clearly how I chose to go in search of those particular years, and asking the sellers for measurements was pointless I'm afraid

    https://www.aliexpress.com/item/4000115305029.html?spm=a2g0o.productlist.0.0.29fa2a4di4Wcpv
     
  7. Dropdead53

    Dropdead53 Active Member

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    Lol we must have done similar research, I came up with similar gsxr1000 rearsets, and some years of the 1000 used the same as the gsxr600 as well. late 90’s fzr600 and I think most of the fzr400 models were all the same, however it was easier to find rearsets to fit a fzr400 and not a fzr600 (go figure).
    Having said all that the gsxr rearsets that we’re a possible fit were notably more expensive then the fzr400 ones that I bought and I feel like fzr400 ones are most likely to be a better fit than Suzuki ones. I guess only time will tell, the rearsets I bought only got shipped from United Kingdom yesterday so it will probably be a few weeks before the moment of truth!
     
  8. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    What can I say - clearly, great minds think alike

    The ones you have ordered at least look to be very sturdy and if they don't fit they should easy enough to see on to someone with an FZR400
     
  9. Dropdead53

    Dropdead53 Active Member

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    Update:
    Ok so the fzr400 rearsets came in the mail today!
    They look pretty nice!
    6EC6DA97-ACB9-47F6-A3BB-3728E54E412A.jpeg
    I had a few spare minutes this afternoon to start replacing the brake side rearset.
    I’ve found a few issues already as follows;
    -You can’t fit the heel guard on with these rearsets, it has to stay off(at this stage).
    -The bolt holes for the brake master cylinder bolts are too small(just need to be drilled larger)
    -Obviously you cant run the electric brake light switch,has to be a pressure switch(not a big deal).
    -There’s no hole for a split pin on the end of the brake rod mount.(just need to drill a small hole).
    -The brake rod is too long,will probably need to shorten the rod as I don’t think the adjustment will be enough.
    Other then those few minor things, I think it’s going to work!
    E3EE4D46-A609-433B-9B06-D43D75D98141.jpeg
    Old pegs

    EA7AB8A3-7589-484D-8B12-C60186D98894.jpeg
    new rearsets (in progress)

    On the gear shift side, the gear shift linkage arm looks abit too long, I may need to shorten it abit to make it work but I’ll cross that bridge when I come to it.
     
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  10. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I forget how the brake light switch attaches I seem to recall swearing at it because it was so fiddly

    Is it the switch mechanism holder which won't go anywhere or the attachment for the wire to the pedal itself

    BTW that has all worked out quite well especially given that the hole spacing was the all important element
     
  11. Dropdead53

    Dropdead53 Active Member

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    It’s abit of a combo, so the bracket for the stock brake light switch piggy back onto the heel guard bolts and sits behind the heel guard (which the heel guards get in the way of the rearsets), also there is no where to hook the spring into the back of the brake lever to activate the light switch.
    With abit off tweaking, you could probably get the stock switch to work, but it would be just as much work to fit up a brake pressure switch anyway and the pressure switch I bought only cost me $35 delivered
    6EFBE154-AD0A-48E7-84AC-624990DC650C.jpeg
     
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  12. Dropdead53

    Dropdead53 Active Member

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    Another small issue is that now that the brake master cylinder is moved back and up a little bit, my braided rear brake line has abit more of an arch in it, again not a big issue but notable none the less.
     

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