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Help Buying an FZR3LN

Discussion in 'Yamaha 250cc In-Line 4's' started by Joker, Jan 6, 2015.

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  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Just get the premix

    Sprocket

    Thanx mate for the info on the sprocket ...... my first thought when I looked at it (before removal) was its original also .... its very worn and the lock washer was very 'neat'

    Can u do me 2 more things
    Can u have a close look at the sprocket and the dampners for any numbers ...... and yes don't throw them away ...if u don't want them Ill pay u postage to send them to me.
    Also can u measure the length of the splined section of the shaft

    splines.jpg



    Please read all the discussion on Grasshoppers 3LN3 thread (near the end) ....... u will more than likely strike the same problem and the fact that your front has never been replaced points even more toward the fact that the correct front sprocket ( 9mm 17T 428 pitch ) for 3LN3 onward does not exist.

    The 3LN3 and 3LN6 here both had the 520 chain on them ..... which comes with the wider 9mm layered sprocket...... which incidently was only 13 tooth and with the bigger sized chain , chews into everything in its path.
    For general riding stick to the stock setup!

    Ill be interested to know how u go with it

    thanx matey

    chains.jpg
     
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    GreyImport, Jan 10, 2015
    #81
  2. risky

    risky risky

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    there is stuff at the bike shops and is dearer. say bike and double the price. i use the green as that was what was originally in my bikes.what ever you use flush out the old and do a 50/50 mix of concentrate and demineralized water.
     
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    risky, Jan 10, 2015
    #82
  3. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Mclaren, Jan 10, 2015
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  4. Joker

    Joker See "about me" for contact details. Contributing Member

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    @GreyImport I'll hang onto the sprocket for the time being, I get a bit nervous chucking OEM stuff away when replacing with aftermarket stuff.

    Couple more photos below, notice the raised face (it is 9mm wide in total if you include this, perhaps this is the interesting point). No markings anywhere on the sprocket, only "17" stamped on the rubber - that's it.

    I glazed over the thread but I'll look at it in more detail now.

    I've ordered the 55t rear and the 17t front with the kit from slipstream (tsubaki o ring kit) - hopefully will have minimal issues but we'll see.
     

    Attached Files:

    Joker, Jan 10, 2015
    #84
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea that's the magic sprocket ...... with the raised face 17T 9mm and assuming its a 428

    You will get the flat 17T 7mm sprocket with that kit ...... if u don't Ill eat the leftovers of the Huntsmans hat meal.

    And it wont tighten on the shaft.

    Thanx again Stu
     
    GreyImport, Jan 10, 2015
    #85
  6. Joker

    Joker See "about me" for contact details. Contributing Member

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    I read the thread.. what's the main "watchout" point? Am I going to need a spacer or something...? In between all the beer drinking and admiring the work being done I did read something about sprocket problems lol :)
     
    Joker, Jan 10, 2015
    #86
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Everyone supplies the flat 7mm sprocket .....fine for the 3LN1
    Newer models require thicker sprocket for a longer output shaft
    So far unobtainable
    Tried to get a Zeal part numbered one but $80 was a bit rich for an experiment

    On Grasshoppers bike I used a 'spacer' to get it up and running ...... I would ultimately like to find the right sprocket , buy thousands of them and sell them for a ridiculous price and make a million :imtheking:

    seriously though ....... someone somewhere must have them ........... when I return from O/S Im going to contact a few of the sprocket makers ..... the chances are they are used on something else ..... ATV , snowski , wateva
     
    GreyImport, Jan 10, 2015
    #87
  8. Joker

    Joker See "about me" for contact details. Contributing Member

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    Hmm... I would simpy use a 2mm washer as a spacer. The raised face faces outwards, not in between the sprocket and the engine so I would think it's pretty straightforward. The positioning of the sprocket relative to the rear is really unaffected by the raised face? Or have I missed something completely? If push comes to shove I'd probably attempt a spring washer of some sort in that area (between the lock nut and sprocket)...?

    I can see more complications if the raised face was between the sprocket and the engine though?
     
    Joker, Jan 10, 2015
    #88
  9. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I would think a splined washer/spacer would be good ...... but that's something that would have to be specially made
     
    GreyImport, Jan 10, 2015
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  10. Joker

    Joker See "about me" for contact details. Contributing Member

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    Surely you could just order two more of those "bent up" washers, flat though (1mm thick each) and use them? Or am I oversimplifying this?
     
    Joker, Jan 10, 2015
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  11. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    As I commented in the other thread ..... sure theres plenty of pretty easy fixes ...... but to me I like to solve it without being too dodgy .... mainly because its in a very high load , high RPM area

    And no u cant add washers at the front ....... I put the spacer at the back ....the flat surface of the sprocket has to sit correctly at the front of the splines because of how the indented nut works...... u will see wat I mean when u try it.

    Was just looking at the other bikes here ..... its not the shaft length that's different its the length of the end piece .... taller on the 3LN1 therefore leaving a lot less spline showing and therefore a thinner sprocket required.

    shaft.jpg
     
    GreyImport, Jan 10, 2015
    #91
  12. Joker

    Joker See "about me" for contact details. Contributing Member

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    Hmm I get the challenge of what you're saying. I'll see what it looks like when I get the new kit.

    I did have a bit of a brainwave when I was thinking about it though - this may add further mystery...

    When I was gearing up to remove the sprocket, I was considering how I was going to this as I actually don't have the right size socket for the nut. I decided I would see how I went, bike was in gear. I flattened the washer down and... unscrewed the nut by hand. It was never tight to begin with...

    Obviously the lock washer can't turn with the nut if it's sitting on the end of the shaft... so I'm a bit puzzled at the possibility the lock nut had never tightly secured the sprocket to the shaft since it was manufactured... considering it is likely the OEM sprocket too...
     
    Joker, Jan 10, 2015
    #92
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Some people are haunted by small things (I am one of those), others will use a piece of fencing wire and they are happy, and somewhere in between is where most normal people live. The factory would have fitted a thicker sprocket for a reason. Perhaps they determined that the previous models were too thin and were creating too much stress on the splines/shaft. In any case it is usually prudent to assume that they knew what they were doing. Personally I think that it will not be hard to find the correct part once someone can establish direct correspondence with a company that manufactures sprockets (like Renthal) and gives them the dimensions. Dealing with shops is pointless, they will just refer to what their 'book' tells them.
     
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    maelstrom, Jan 10, 2015
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  14. Revolver

    Revolver Big Member Premium Member

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    Should of ordered the K&N 303 oil filter with it. Wont need a screwdriver next time. Just grab the appropriate socket....

    @GreyImport I used the sprocket from slipstream, put it straight on, no spacer, done 4000k's. Havent had any problems so far. No sure what the issue is? I actually covered the whole sprocket issue in the 1st or second page of my thread.
     
    Revolver, Jan 10, 2015
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  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    The old one had the raised side so it was a 9mm

    So the questions are ....

    Was it a 428 kit with the flat 7mm sprocket ?

    or did u fit the 520 kit which has a 9mm sprocket in it ?
     
    GreyImport, Jan 10, 2015
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  16. Joker

    Joker See "about me" for contact details. Contributing Member

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    I was looking at my chain and it has "428" on it probably as expected.
     
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    Joker, Jan 11, 2015
    #96
  17. Revolver

    Revolver Big Member Premium Member

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    Fitted the 428.
     
    Revolver, Jan 11, 2015
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  18. Willrcr15

    Willrcr15 Well-Known Member

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    Looks like you got a good un molested bike.
    Mine has an idle rattle & it's the Exup valve as the bushes have worn out. The valve is easy to remove & check. I need another one if anyone's got a spare.
    We all went to hell & back last year with the carbies & turned out that in most cases the fuel inlet insert's O ring was shagged & causing flooding to different degrees, take some advise & replace them all with the Litetek kit, don't leave anything to chance, the kit will fix any carby issues. Funny thing, I've just done the carbs on the RGV & someone has been chasing a flooding carby, they've filed the needle edges thinking it was sticking in the insert, when I removed the insert it just fell out cause the O ring was shagged, fitted new ones & perfect now.
    I found the sweet spot for my FZR carbs, 2 turns out on the mixture & second clip down from the top, we were running 3rd clip down & too rich, much carbon build up around the exhaust tip, we did a 180km run last weekend & no build up & she never ran better according to the test pilot. it's a 3LN1.
     
    Willrcr15, Jan 11, 2015
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  19. Joker

    Joker See "about me" for contact details. Contributing Member

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    Mine looks like it needs a new EXUP cable, I barely undid the screws to the valve but can't get the thing off to check if it's all good. I may just leave it as I don't recall a particular problem with it. Just afraid I'm going to dent or break something getting it out.

    Hit the exhaust with a wire brush today and some rust kill. Should come up pretty well. Just awaiting the new chain/sprocket kit and carby kit after which she'll go back together and see how she goes. Might do the forks while she's off the road too, they're pretty soft.
     
    Joker, Jan 11, 2015
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  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Jan 11, 2015
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