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Project My FZR250 3LN6

Discussion in 'Your 250cc Projects' started by driftwood, May 10, 2020.

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  1. driftwood

    driftwood Well-Known Member

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    Hidey-ho neighbour. I'm working on a 3LN6, just scoping the damage! Carbs are needing a cleanout before it fires up. Sure there'll be more - the fuel tap Off position had a leak, so the eng was lubed by something the consistency of diesel. And black plugs looks like it was ridden that way. Here's my collection of lemons (and yup, the Brumby is included!)

    IMG_20200429_161809.jpg
     
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    driftwood, May 10, 2020
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  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Welcome to the forum
     
    my67xr, May 10, 2020
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  3. risky

    risky risky

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    risky, May 10, 2020
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  4. Mike Green

    Mike Green Well-Known Member Premium Member

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    Looks like you got a nice one. Do a full service. Especially check the valve clearances. The poor things have a bit of history of being neglected mechanically I think. I have a couple of engines here and used to work in a Yamaha shop for a few years. If looked after I'd expect it to run sweet for years.
     
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    Mike Green, May 10, 2020
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  5. 2valve

    2valve Well-Known Member

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    :welcome:.
     
    2valve, May 10, 2020
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  6. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Welcome
    A 3LN6 is quite a rare beast

    Interested to see if you can answer one question on the 3LN6 - does it have an oil pressure gauge - just something which I read recently

    BTW for your work/restoration it's worth making your own individual thread so that information and replies don't get crossed over and become confusing
     
    ruckusman, May 10, 2020
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  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Moved to Projects
     
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    GreyImport, May 10, 2020
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  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, May 11, 2020
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  9. driftwood

    driftwood Well-Known Member

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    Negative oil gauge. I'm only guessing 3LN6 by eng num 1hx340627... affirm the temp gg tho'.
     
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    driftwood, May 11, 2020
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  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Welcome, not many of those about. Check the carbs to make sure they are 3LN6 before you order any bits and pieces. The needles are held in place differently to all the other models and the slide housings have a sealing ring. https://litetek.co/Carb_Kit_Yamaha_FZR250_3LN6.html Our part SH-002 on this page.
    Motorcycle Spares Warehouse might have Keyster kits for them as well.
    Cheers
    Blair
     
    maelstrom, May 11, 2020
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  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Attached Files:

    ruckusman, May 11, 2020
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  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Oil level sensor is on the 3LN1
    Oil pressure sensor 3LN3 onwards


    CarbNeedleAssembly 6-7.jpg cutaway 1.jpg cutaway.jpg
    float bowls.jpg
     
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    Last edited: May 11, 2020
    GreyImport, May 11, 2020
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  13. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    ruckusman, May 11, 2020
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  14. driftwood

    driftwood Well-Known Member

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    My valve clearances are fine, but carb o/haul didn't go so well - first thing I see are hexhead screws over the needle jet corroded thru on a couple. Fallen off at 1 thread point. Think I'd like to hand over for reco.... anyone in Melb do this pls?
     
    driftwood, May 20, 2020
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  15. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, May 20, 2020
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  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Put up some photos of the problems with the carbs so we can point you in the right direction
     
    GreyImport, May 20, 2020
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  17. driftwood

    driftwood Well-Known Member

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    driftwood, May 20, 2020
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  18. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, May 20, 2020
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  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    That diagram ^ is of 1987 2KR carby's, but the same emulsion tube screw is used on both the 2KR and 3LN carbys
    For 3LN6 emulsion tube's they may be harder to find as they're obsolete now

    I reckon this carby kit is for either the 3LN6/7 or the Zeal FZX250 but the seller wont tell me what jet's are in the kit ?
    https://www.ebay.com.au/itm/1-Set-1...899682&hash=item445920fed6:g:n9UAAOSwn2lenUb2

    Zeal carby kit (emulsion tube is different to the 3LN6/7 emulsion tube)
    https://www.aliexpress.com/i/32957697928.html
     
    my67xr, May 20, 2020
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  20. driftwood

    driftwood Well-Known Member

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    Carb overhaul completed. Still not firing, even with StartYaBastard sprayed into throats.
    Good sparks, and resistance of 33kOhm plug-plug is exactly what the FZR400 coil&leads spec says. I wonder about timing, but can find no info whatsoever on adjusting the slotted screw in the alternator cover - nor where timing marks can be found???
     
    driftwood, Aug 7, 2020
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