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Thread: newbie/brake parts question

  1. #1
    Join Date
    Apr 2012
    pass christian
    United States
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    Default newbie/brake parts question

    hello all im new to all this been a while since i rode a bike getting back into it anyway here is my question what does 4xy or 4nk mean in the part # i have a 97 1300 royal star the master brake calls for part # 4nk-2587-02-00 i found a part 4xy-2587-10-00 on ebay seller says its for a 09 venture they boyth take the same rebuild kit will this work on my bike same seller also has clutch master i may need will all this work needing to get this bike on the road so bad i can taste it (have to stick my head out the window of my truck to get a little wind in my face lol) but will not compromize safety. bike sat for 3 yrs before i got it as an aniversary gift in oct. both master and slave are ruined i replaced slave with a new one dont like the price of new master cyl. ive done enough rambeling thanks for the help in advance.

  2. #2
    Join Date
    Oct 2011
    United States
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    The NK numbers are Yamaha's numbers. The first number you listed is not correct the first digit after the 4nk is missing which was originally a 2 but has been replaced with a "W". I could not find a direct match to the second number you gave to your model year so my guess is that there is some difference, bolt matching or something maybe not in the cylinder itself but something doesn't match exactly. You also say you have a 97 royal star but no model so for future help, please be sure to specify, cause they don't all use all of the same parts. You also don't say what was wrong with them other than ruined so don't know why you wouldn't rebuild the masters, it is easy and much less expensive. You did the right thing in replacing the slave on the clutch and if you can do that job the master rebuild will seem really easy. Good Luck and stay Safe!

    81 XS Venturer (sold)
    96 RSTC

  3. #3
    Join Date
    Aug 2006
    Carmichael CA
    United States
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    The first digit/letters of a part number designate what model year the part originally appeared or subsequently been modified in anyway... Even color... The last series of numbers are the actual part number and will work with any previous year. If they had modified it where it wouldn't be compatable they would have assigned a new part number.

  4. #4
    Join Date
    Sep 2008
    Cape Coral
    United States
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    A little more clarification on Yamaha Part numbers. The first three digits, in this case you have 4NK and 4XY are model codes. This indicates the first Yamaha model that part was used on. These three digits are also in the Primary ID and VIN of the first applicable model. The second five digits is the part type. YOU are missing a digit in your post, but as a general rule all front brake master cylinders will have the same 5 digit part code. The last two sets typically end in 00-00 or 10-00. The first set of two are typicaly supercedes, say from 00 on the original part to 10. If there is a finish difference , that is usually in the last two digits, and are typically letters.

    If you look up part numbers for the Royal Star clutch ( I used a 2006 RSTD), the majority of them start with 26H. For instance the clutch basket (Primary Driven Gear Comp) is 26H-16150-10-00. 26H is the model code for the 1983 Venture. If you have a 1983 Venture you also will see that 26H is digits 4 5 and 6 of your VIN. Typically superceded parts are, improved and superceded parts with the same 3 digit model code are interchangeable. Another example. Fuel filters. 6K8-24560-10-00 and 1FK-24560-10-00. 24560 tells you its a fuel filter since all fuel filters are 24560. 6K8 is a fuel filter from a Yamaha Waverunner, 1FK is a Royal Star fuel filter, and no they don't interchange.

    2009 Venture Frt Master Cylinder 4XY-W2587-10-00

    2007 Royal Star (XVZ13AJ) Frt Master Cylinder 4NK-W2587-02-00 ( and from Yamahas website this number superceded from 00-00)

    If a part number has a different model code, that means the part is unique to that model. If I had to guess, the difference in the venture master cylinder and the one for your RoyaL star, is the mounting angle to the handle bar. Different handlebars and handlebar pull back, angle etc would make this part of the casting unique, and thus model specific. If it takes the same rebuild kit , than the bore diameter and stroke is the same. IT will probaly physcally fit (assuming the handle bar diameter is the same), but the installed angle may be wrong and may affect braking, fluid angle in the reservoir,etc.

    Unless you Brake master cylinder has physically broken castings or severe pitting on the bore, it should be servicable. I have seen very few that couldn't be cleaned up, honed and reused.

    Last edited by RSTDdog; 04-16-2012 at 01:45 PM.
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