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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. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    It's nice to be loved...:lolsign:

    Yes, we come up with all the good terms in Tamworth: Cow Yodelling & Boganisation..lol
     
    Grasshopper, Mar 10, 2015
    #221
  2. Murdo

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

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    Don't you blokes get too pissed while I'm away, Robbo wants me to attack his fizzer carbs next week and I may need your help!!!!
     
    • Like Like x 2
    Murdo, Mar 11, 2015
    #222
  3. risky

    risky risky

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    yep, the cow yodellers come and the bogans leave.lol.
     
    risky, Mar 11, 2015
    #223
  4. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Got to Tamworth OK. Took all the gear off and heard bubbling. Coolant in the overflow was boiling, along with the radiator as well.

    Temp gauge was never above 1/3 and the bike wasn't doing anything odd... Maybe a radiator blockage? Bad water pump? Don't know at the moment... will have a closer look tonight
     
    Linkin, Mar 12, 2015
    #224
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I would check thermostat, temp gauge and temp sender first.
     
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    Last edited: Mar 12, 2015
    maelstrom, Mar 12, 2015
    #225
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Now go for a ride on Dad's fizzer and tell us what you think?
     
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    maelstrom, Mar 12, 2015
    #226
  7. Phil

    Phil Senior Member Contributing Member

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    What we are all waiting to hear is............what sort of mileage did you achieve on your journey ???
    Your previous comments suggested that shares in an oil company would be beneficial if not mandatory :lolsign:
     
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    Phil, Mar 12, 2015
    #227
  8. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    On the last stretch I flicked it over to reserve, did about 130km and filled up 8.53L
     
    Linkin, Mar 12, 2015
    #228
  9. Joker

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

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    Hmm.. if it's boiling it's not being cooled. The thermostat may be broken but I'd think that's a secondary issue. I'd take the radiator off and give it a flush through first with all the hoses as well. You should be able to fill back up with water, reconnect up, start up bike with radiator cap off and with a torch see if you can see the liquid moving in the radiator. If it is, problem fixed. Otherwise you may have a water pump problem...

    Riding the bike is still air cooling the engine to an extent but I'd be cautious going for long runs...
     
    Joker, Mar 12, 2015
    #229
  10. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Yeah will give that a go once we get bikes over to the fizzer factory garage.
     
    Linkin, Mar 12, 2015
    #230
  11. Moo

    Moo Plodge Racing!!!

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    second this suggestion.....
     
    Moo, Mar 12, 2015
    #231
  12. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Thermostat in pot get boiling if doesn't open this will be issue if opens possibly blockage but I know from experience the thermostat housing on these are a pain to get to compared to the cbr
     
    Mclaren, Mar 12, 2015
    #232
  13. Joker

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

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    @Linkin did 147km today, still not on reserve. Is yours getting any better?
     
    Joker, Mar 12, 2015
    #233
  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    On the job sheet for tomorrow ...

     
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    GreyImport, Mar 12, 2015
    #234
  15. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Fizzer Factory progress report

    Carbs taken off 3LN3/7 and 3LN6 for inspection/comparison. It has 3LN1 carbs on it.

    Worn needles etc, but internally are in good nick & are pretty clean

    [​IMG]

    [​IMG]

    [​IMG]


    We took the carbs off the 3LN6 - This is where stuff gets interesting - The 3LN6 appears to be completely original - engine and frame match, as does the dash, front brake resoivor, brake lever, etc.

    We have confirmed a few things that should make it easy to identify the carbs.

    3LN1 carbs have the idle knob fixed in the centre of the carbs. 3LN3 and newer have the idle knob extended on a cable. Below is a comparison of exterior markings. 3LN6 carb bank on top, 3LN1 carb bowl cover below

    [​IMG]

    The slides on the 3LN6 carbs are rounded

    [​IMG]

    The 3LN6 float bowl covers have 4 screws holding them on

    [​IMG]

    This is what the needle assembly looks like. Each needle has it's own little spring that allows it to move, and is held in with a plastic screw

    [​IMG]

    [​IMG]

    [​IMG]


    We only stripped one of the screws on the 3LN6 bowl covers, even with the correct JIS driver. The others were really tight but we got them loose

    [​IMG]


    This is where stuff gets ugly - not for the faint hearted... these are the 3LN6 carbs

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    Yuck!!!

    We didn't get a good look at the emulsion tubes on the 3LN6 bank of carbs, but the needle we pulled had very little wear, and was larger. The emulsion tube had a larger inner diameter and didn't look worn. It would appear they are different to 3LN3/5.

    The 3LN6 carbs will definitely need a trip through Brian's ultrasonic cleaner.

    The 3LN1 carbs on my 3LN3 frame with 3LN7 engine will just need new needles/tubes and a litetek kit to sort them out.

    Stay tuned for tomorrow night...
     
    Linkin, Mar 12, 2015
    #235
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The slides on the 3LN6 carbs are rounded
    That is the cutaway. It drastically affects the off idle to 1/4 throttle mixture. Extremely noticeable on 2 strokes.

    The needles look to be in very good condition on the 3LN6.

    What the hell is that green stuff?
     
    • Like Like x 1
    maelstrom, Mar 12, 2015
    #236
  17. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I was hoping you could tell me, seeing as you ar Mr. Green and all :D
     
    Linkin, Mar 12, 2015
    #237
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I wonder what is in the fuel tank?
     
    maelstrom, Mar 12, 2015
    #238
  19. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Have a taste of that green sugar. Maybe it is sherbet :)
     
    maelstrom, Mar 12, 2015
    #239
  20. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    The carbs were sitting on the bike for a long time, and the fuel in there smelt like varnish/paint... It seems to have crystallised in there... amazing that they ran at all....
     
    Grasshopper, Mar 12, 2015
    #240
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