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Project Linkin's FZR250R 3LN3

Discussion in 'Your 250cc Projects' started by Linkin, Jan 31, 2015.

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  1. Revolver

    Revolver Big Member Premium Member

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    Man, I need to have a look at my pilot screws then, mine is a bit boggy under 4k. 5-6 on take off is better. However depending on how I ride, 180-190ks is my reserve changeover.
     
    Revolver, Mar 8, 2015
    #201
  2. Joker

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

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    Are you sure that would be the pilots? They're idle settings. Wouldn't boggy at low RPM be needle settings?
     
    Joker, Mar 8, 2015
    #202
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    carb_jet_usage1.jpg
     
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    GreyImport, Mar 8, 2015
    #203
  4. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Don't forget that the pilots influence the mixture throughout the entire rev range, contrary to the "pilot" name.

    After setting them to 2.5 turns out, the bike is no longer boggy below 8k RPM (below 6k RPM is still iffy), has far more low end torque and once above 10k RPM it starts to really take off. @Grasshopper reports the bike as scary fast after changing the needles and jets, and his settings are lean at the moment.
     
    Linkin, Mar 8, 2015
    #204
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    The other thing u need to do @Linkin is pull the HT leads and caps and snip a couple of mm of the ends and re screw the caps into the new wire ..... and new plugs if u havnt already ..... made a hell of a difference to the grasshopper machine .... a couple of the ends were 'rusty'
     
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    GreyImport, Mar 8, 2015
    #205
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Much as the BDST carbs are maligned by all and sundry, they are eminently rebuildable, what can you do with a Keihin when it wears?
    When this carb was released on the GSX-R750, Suzuki thought it was such a big deal (I assume the flat slides and smooth bore in a CV carb) that they were dubbed 'Slingshot' and promoted as a positive selling point. When functioning correctly they should be a good carb.
    The double pilot circuit, half is fixed and the other half metered, allows for a lot of fine tuning, but probably creates a lot of sensitivity.

    Now that the source of the 'chugging' problem has been identified and with the amount of owners now 'fine tuning' their settings I expect that there won't be too many secrets left that cannot be overcome.

    I plan to make new diaphragm rubbers in both Viton and NBR over the next few months and the prices should be very good (fingers crossed).

    cheers
    Blair
     
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    Last edited: Mar 8, 2015
    maelstrom, Mar 8, 2015
    #206
  7. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Yep its got new plugs, when the engine is in pieces for the cam chain and valve clearance check I'll get them to snip the leads

    Good stuff
     
    Linkin, Mar 8, 2015
    #207
  8. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Grasshopper, Mar 8, 2015
    #208
  9. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    So I have a 5 day weekend starting this Thursday, but instead of going south to VJMC, I will be going north to The Fizzer Factory(tm) Head Office.

    With 5 days off work and some helpful hands, I hope to sort out the cam chain and do some other misc stuff like identify what carbs are on the bike. My package from Mr. Green arrived today, which will be going on @Grasshopper's bike/carbs. Don't have any more of those Keyster kits yet (payday is next week) but with hopefully another order from Mr. Green (if my carbs are 3LN3/5 and not 3LN6/7 - either way, I still need to get kits for the 3LN6), we will have successfully rebuilt 2 sets of carbs.

    Once we assemble the Green Team (@GreyImport , @Grasshopper , @Linkin , and perhaps Dr. @Murdo should we get stuck ) there will be many photos, and much consumption of large quantities of beer!
     
    Linkin, Mar 10, 2015
    #209
  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    After all that you guys will be the Gods of Fizzer Carbs.
     
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    maelstrom, Mar 10, 2015
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  11. Joker

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

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    Hopefully the beer drinking comes AFTER you fix the carbs. I can't imagine you'd fix them otherwise lol
     
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    Joker, Mar 10, 2015
    #211
  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    No way! Beer drinking will be before, during & after. Priorities are involved here.
     
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    maelstrom, Mar 10, 2015
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  13. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    To put up with these bastards all weekend Ill be having beer for breakfast

    :fuckyou:
     
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    GreyImport, Mar 10, 2015
    #213
  14. MashtX

    MashtX Well-Known Member

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    Aww Grey, surely they can't be that bad?
     
    MashtX, Mar 10, 2015
    #214
  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    To translate from Australian to English:
    "To put up with these bastards all weekend Ill be having beer for breakfast"
    I look forward with anticipation to enjoying the company of these good people to such an extent, that I shall start my day with a refreshing ale.
     
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    maelstrom, Mar 10, 2015
    #215
  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    You know they are father and son right?

    :lolsign:
     
    GreyImport, Mar 10, 2015
    #216
  17. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Or to boganise it ....

    Any excuse to get pissed as
     
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    GreyImport, Mar 10, 2015
    #217
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Boganisation!
    Wow, my vocabulary is just expanding in leaps and bounds. You gotta love this forum :D
     
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    maelstrom, Mar 10, 2015
    #218
  19. Joker

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

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    So you're saying you enjoy their company as long as you don't remember it?
     
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    Joker, Mar 10, 2015
    #219
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Factory doesn't open till I see this parked outside ......

    beer truck.jpg
     
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    GreyImport, Mar 10, 2015
    #220
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