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Project Grasshoppers FZR 3LN3

Discussion in 'Your 250cc Projects' started by GreyImport, Feb 16, 2014.

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  1. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Yeah, I'll be able to check all that when I pull them to bits...
     
    Grasshopper, Feb 8, 2015
    #201
  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Yamaha FZR400 *Triumph Bonneville 750 T140V *Triumph Daytona 675 *Triumph Tiger 800XC
    And if your going to Litetek them we need to check the jet housing to ascertain if they are actually 3LN3 carbys
     
    GreyImport, Feb 8, 2015
    #202
  3. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I haven't ordered any carb kits yet (waiting for the 3LN6-7) but I do have the fuel tap bits on the way. Hopefully they'll get here before you get back
     
    Linkin, Feb 8, 2015
    #203
  4. Joker

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

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    If you want to check anything against mine for a comparison let me know.
     
    • Like Like x 1
    Joker, Feb 8, 2015
    #204
  5. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I've been reading through Brian's thread, specifically the saga about the float height on the mikuni carbs.

    It's definitely doing the same chugging, you have to stop, hold WOT and slowly back off until the revs pick up again. Choke does nothing.

    I got stuck in an underground car park because each time I tried to go up it would start chugging or die! Had to roll down the bottom, get it going, and go uphill with some speed

    Float height needs investimagation.

    PS: Post from Ruckusman/Glenn in Brian's thread

     
    Linkin, Feb 8, 2015
    #205
  6. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Yes, and I think this is what my problem is... I just bought a set of carbs, and guess what the owner said.... (he told me the needles and seats ar buggered..)

    il go in this week and get a quote for postage this week. they will run the bike. I only took them out last night and I ran the bike at a competition on Friday night. they just flood the bike if the revs get down around 2000rpm.
     
    Grasshopper, Feb 8, 2015
    #206
  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Re Grey's spare carbs
    Note: I was using a spare set of Grey's carbs before, and no chugging problem.. the only prob with those carbs is it was very hard to start the bike, but once started, seemed to run fine but with fast idle...

    Hard to start and a hanging idle is usually always too lean on mixture screws.
     
    maelstrom, Feb 8, 2015
    #207
  8. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    ok good place to start!
     
    Grasshopper, Feb 8, 2015
    #208
  9. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Sometimes I wonder about doing a fuel injection conversion and pissing off the carbs entirely, but where would the fun be in that?

    Well, the fun would be in riding the bike and not caring :D
     
    Linkin, Feb 8, 2015
    #209
  10. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Naah, I look forward to nailing a perfect set of carbs!
     
    Grasshopper, Feb 8, 2015
    #210
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The web is littered with stories of people trying to do EFI conversions, spending loads of money and then dwindling away to nothing. Have not seen many success stories. EFI has its own Achilles' heel. The control unit will crap out like all electronic boxes and then you have to find another one or use a generic item. That will be coming up soon on second hand bikes with EFI.
     
    maelstrom, Feb 8, 2015
    #211
  12. Phil

    Phil Senior Member Contributing Member

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    How negative can one get Blair. EFI is the future and boy do I love it, press the button and they start every time.
    Have you not read the vast majority of problems associated with most bikes..........CARBIES ?????? YEP
     
    Phil, Feb 8, 2015
    #212
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Last edited: Feb 9, 2015
    maelstrom, Feb 9, 2015
    #213
  14. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Agree with Blair on the EFI conversion, have done a couple of cars and never got the results that were hoped for. An EFI motor is designed for the injection system and just plonking some throttle bodies and injectors on will never be as good as original.

    Phil, where is the sense of achievement is pressing the button and it goes, and goes, and keeps on going forever? Be just like a modern car!

    I have found the biggest problems with carbs on bikes is cleanliness, and people fiddling changing things and thinking they know better than the factory that spent $$$$$ getting it right in the first place.
     
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    Murdo, Feb 9, 2015
    #214
  15. Phil

    Phil Senior Member Contributing Member

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    Blair, please accept my apologies for my response last night. After falling asleep watching the idiot box, thought I'd check the forum. Alas, I missed the word "conversion" and jumped the gun. I am a fan of EFI bikes, just enjoy how well it works.
    Chris and I looked in to fuel injecting an Across many moons ago but couldn't wrap our heads around what was out there and of course with no guarantees ???? The more I read on the subject the less inclined I am.
     
    Phil, Feb 9, 2015
    #215
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    No worries Phil. Always happens when you can't have a face to face conversation with someone and I have a pretty thick hide anyway :)
     
    maelstrom, Feb 9, 2015
    #216
  17. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Yeah, and I have a great EFI bike in the garage that I can't ride yet... and I'm wrestling with FZR carbs... such is life!! :headbang:But, as I have said.. I look forward to building a shmick set of carbs :thumb_ups:
     
    Grasshopper, Feb 9, 2015
    #217
  18. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Oh, I forgot to mention - when I opened one of the carbs up, there were a couple of dead ants in there... :headbang:
     
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    Grasshopper, Feb 10, 2015
    #218
  19. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Jet sizes that I found on the net

    some info on the 3LN single headlight that i have
    main jets on 1 & 4 = 100
    main jets on 2 & 3 = 97.5
    pilot jets = 42.5
    starter jet = 10 ? { may not be correct }
    fuel screw = 2 to 2 3/4 turns

    twin headlight model
    main jets on 1&4 = 102.5
    main jets on 2&3 = 100
    pilot jets = 37.5
    starter jets = 30
    fuel screw = 2 3/4 turns
    needles 1&4 = 5ct7
    needles 2&3 = 5ct9
    nozzels = n8?
    needles on 1&4 have no shim under clip

    this is the only info I have on the carbs and may vary.
     
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    Linkin, Feb 12, 2015
    #219
  20. MashtX

    MashtX Well-Known Member

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    That's really weird o.O my 3EN2 fzr 400 has 87.5 main jets
     
    MashtX, Feb 12, 2015
    #220
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