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Project Grasshoppers FZR 3LN3

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

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  1. risky

    risky risky

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    could be over rich mixture or changed cam timing when accelerator off but both valves open. used in racing to cool inlets and as exhaust open ignites in muffler when comes in contact with fresh air.hrt used to do it.
     
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    • Well said! Well said! x 1
    risky, Feb 18, 2014
    #21
  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    First test ride the other day I had a flat tyre ...........front wheel valve stem was broken and I broke the spare front one while cleaning it, to put on .
    Today I changed front wheel with the repaired spare.
    Also on the ride the other day it was spluttering and I had to roll it home (how unusual) .... turns out the fuel hoses needed swapping from the tank , so that when it was on 'res' it was actually reserve!

    I only went up the local hill a few times and hammered it thru the gears ..... it flew .... felt like the front was going to lift in first ..... the previous owner has definately done something right (carbys were overhauled and valve clearances done) .......really tight and smooth thru the gears also............. makes me realise what a piece of crap mine is and how much off it is.

    At least now we can give the other areas the once over and get this thing up to scratch.

    Front end is not tracking correctly ..... it has hit the gutter or something when its gone down and hopefully it just needs the forks reset in the triple trees.

    How to change a front wheel by yourself the redneck way .....

    Redneck wheel change.jpg
     
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    GreyImport, Feb 23, 2014
    #22
  3. Phil

    Phil Senior Member Contributing Member

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    Done good mate, where there's a will, Grey finds a way.:thumb_ups:
     
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    Phil, Feb 23, 2014
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  4. kiffsta

    kiffsta Senior Member

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    can you borrow these carbs and see if they fix your issues ?
     
    kiffsta, Feb 23, 2014
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  5. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Nice work Gungadin! I can't wait to ride this thing.... and also do some work on it.. Can't let Grey have all the fun!! Thanks mate.. the beers are cooling in the fridge....
     
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    Grasshopper, Feb 23, 2014
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  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Im just going to swap the whole engine + carbs and not tell him :cool:

    And the tools are warming in the shed :lolsign:
     
    GreyImport, Feb 23, 2014
    #26
  7. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Ha ha! Yeah, good one...! Whatever needs to be done to get yours running, we'll do it, coz soon we'll need to go a-riding... Get your compressor warmed up,,, need to do some spray painting!
     
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    Grasshopper, Feb 23, 2014
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  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Crooked as a grasshoppers hind leg ............

    Frontend 3LN3 a.jpg Frontend 3LN3.jpg
     
    GreyImport, Feb 23, 2014
    #28
  9. Phil

    Phil Senior Member Contributing Member

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    Phil, Feb 23, 2014
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  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Hi Mr Grey,
    This is what I have done with hordes of crash repairs.
    Often the lower fork crown is the culprit and/or bent stanchion.
    If the crown then it can be a bent stem or one of the stanchion clamp sections is bent.
    1/ disassemble
    2/ check stanchions are straight
    3/ mount lower fork crown in vice by clamping the stem
    4/ fit stanchions (they can be clamped at their mid-point)
    5/ use engineers level along stem (or good quality level if you don't have engineer jobby)
    6/ Now check along stanchions and across both stanchions with a straight edge and the level
    You should now be able to determine what is bent.
    Now it is up to you whether you want to find replacement parts or repair the existing ones.
    Bent stanchions can be easily straightened if the bend is slight. Out of line by 10mm over length is about what I would consider maximum.

    If the stem is bent it can be pressed out and then have a new one made by your friendly machine shop. If it is aluminium then heating it first will expand it and allow the stem to come out quite easily.

    If one of the clamping sections is bent you need to make up something that will grip the entire section so that it can be straightened. I strongly advise against just using only the stanchion as a lever. I cannot advise you any further here as I would make something with thick chunks of steel and a stub to fit the stanchion clamp etc.

    Remember, I am a dinosaur. These days nobody can afford to do anything because the machine shop wants 8 billion dollars an hour etc. However maybe somebody knows someone with a lathe in their garage who will be happy to help you out.
    cheers
    Blair

    ps
    check the axle and wheel runout while you are there.
     
    maelstrom, Feb 24, 2014
    #30
  11. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Mate bad timing I'm a fitter and turner but am 5 months into a refrigeration trade (dual tickets)
    But still now ppl let me now if u need something might be able to help
     
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    Mclaren, Feb 24, 2014
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  12. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Hmmm, I'll hold it and you bend it back.. Just like we did with our push bikes when we were kids!
     
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    Grasshopper, Feb 24, 2014
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  13. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    A bit of progress on the motorised grasshopper .... sorting out the rear end before we attack the front.

    pit crew at work....

    3LN3 1.jpg
    3LN3 2.jpg

    3LN3 3.jpg


    Rear ready to rumble .... new Pirelli and a bit of spit and polish

    3LN3 4.jpg


    And of course all that toil and sweat deserved a reward .......


    3LN3 5.jpg
     
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    GreyImport, Jul 2, 2014
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  14. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Hard at work today on the Fizzer (I was anyway...!)

    fzr1.jpg

    Polished the rear end a bit!

    fzr2.jpg
     
    Grasshopper, Jul 3, 2014
    #34
  15. kiffsta

    kiffsta Senior Member

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    that's rear rim has come up a treat :thumb_ups:
     
    kiffsta, Jul 3, 2014
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  16. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Yeah, I was pleasantly surprised! All the scrubbing with the steel wool was worth it.
     
    Grasshopper, Jul 3, 2014
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  17. Phil

    Phil Senior Member Contributing Member

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    So much for you're pit crew????...................out to it or drinking beer? great team :lolsign:
     
    Phil, Jul 3, 2014
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  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Someone has to supervise ...... :cool:
     
    GreyImport, Jul 3, 2014
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  19. Murdo

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

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    How can I get a job on your supervision team? How much beer do I need to bring? :D
     
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    Murdo, Jul 4, 2014
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  20. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    bringing beer gets you the job - easy eh!
     
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    ruckusman, Jul 4, 2014
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