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Help FZR 250 3LN carb slide question

Discussion in 'Yamaha 250cc In-Line 4's' started by richie, Mar 29, 2015.

  1. richie

    richie Active Member

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    Here goes im rebuilding a set of fzr250r carbs. My question is what causes free play in the slides, 2 are perfectly tight and two have free play in them but if i swap one from carb 2 to 3 the free play remains in that carb rather than changing with the slide?? Very confused with this as thought it was the diaphragm but now it dont know :-( help much appreciated
     
    richie, Mar 29, 2015
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  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Mar 29, 2015
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  3. richie

    richie Active Member

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    Im not sure if it would be that as the bike has only 22km on it and wouldn't all 4 be worn out then? Its really bugging me now as it will cause problems in the first 1/4 of throttle i have 3ln1

    Ah i forgot to mention the play is upwards like weak spring or diaphragm bt this doesnt seem to be the case either
     
    richie, Mar 29, 2015
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  4. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    They're all grey imports, the clocks are not to be trusted. It could 122k kilometres
     
    Linkin, Mar 29, 2015
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  5. richie

    richie Active Member

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    Shh now thats blasphemy lol i found the problem all be it a stupid one, the needle is not pushing on the slide due to someone replace the two brass screws with the holes for the needles on the jet housing with normal screws with no hole for the needle!! So now i need to know where to get two of these brass screws? Ebay perhaps? Its part 16 on the exploded diagram of the carb
     
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    richie, Mar 29, 2015
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  6. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Just buy a cheap set of carbs off a wrecked bike..... or someone here may have extras.... ask @GreyImport
     
    Grasshopper, Mar 29, 2015
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  7. richie

    richie Active Member

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    Im assuming it will have to be an fzr that they would have to come off? Theres no such thing as cheap in ireland :( what kills me is the keyster carb rebuild kits i bought didnt come with them :-/
     
    richie, Mar 29, 2015
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  8. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    We could find one here for you and send it over......?
     
    Grasshopper, Mar 29, 2015
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  9. richie

    richie Active Member

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    That would be brilliant! Or even if someone here had a yamaha part number for it them my nearest yamaha fairly far away but the brass screws are surely inexpensive even from yamaha?
     
    richie, Mar 29, 2015
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  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Mar 29, 2015
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  11. richie

    richie Active Member

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    Legend i will order some time off the uk crowd :) also would this have cause my bogging in the 1/4 throttle range?
     
    richie, Mar 29, 2015
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  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I would say yes ..... as we have discovered here lately , new and correctly operating needles and tubes make all the difference.
     
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    GreyImport, Mar 29, 2015
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  13. richie

    richie Active Member

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    I have brand new ones. Just waiting for 4 square washers for main jets and diaphragm and now i need two of those brass screws and then finally my carbs will be ready to put on after a sync!
     
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    richie, Mar 29, 2015
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