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Project FZR 250 3LN3 Restoration

Discussion in 'Your 250cc Projects' started by CafeRacerNut, Sep 4, 2016.

  1. CafeRacerNut

    CafeRacerNut Active Member

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    Hi Guys so I just bought myself an FZR250 from my buddy and she is in a bad state.
    I need advice there is spark,carbs is in okay condition swings but doesn't start. I really hope it isn't timing related.
    Like I said she is knackered but most of it is there.
    What I need: Fuel pump, Taillight, Tank Cap, New Ignition, New Tires, New Chain and Sprockets and very very very obviously paint and stickers fzr.jpg
     
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  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Might be worth trying to get it started by pouring a little fuel down each carb, then refit the filter and airbox and try firing it up
    You could even try spraying some Aerostart (CRC Jump Start Starting Fluid in South Africa) into the front through the airbox intake (Bit awkward to get get to though)
    If you take the tank off and set up a small fuel tank to gravity feed the carby's
    Try cranking it with full choke, no throttle if nothing 1/2 choke no throttle, 1/4 choke no throttle 1/8 choke no throttle
    Or lastly maybe a touch of throttle and no choke

    Ignition switch and key, and matching keyed tank cap is cheap off ebay etc example- http://www.ebay.com.au/itm/Ignition...356704?hash=item2817d266e0:g:PYYAAOSwQNRXLyQ0
    Might be able to find them cheaper too, i'm sure i have found them for around $30AU the pair

    Chinese Cap with key $12.85 AU
    http://www.ebay.com.au/itm/Fuel-Gas...414450?hash=item3607c26572:g:DoQAAOSwHoFXvXKK

    http://www.ebay.com.au/itm/Ignition...408988?hash=item2349a50d5c:g:ApAAAOSwwbdWQvgC


    Correct fitment front sprocket from Litetek-
    http://litetek.co/Sprocket_Drive_Yamaha_FZR250_3LN3.html
     
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  3. CafeRacerNut

    CafeRacerNut Active Member

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    Thanks a lot man, I took the bike apart no sort of,decided that building cafe racers is my thing so instead of restoration I want to build the most bad ass fzr cafe on the block.(This decision is driven mostly by parts availability and the horrendous condition of the fairings)
     
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  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yamaha's , 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G, 1976 IT400C 510
    A couple of good 3LN3 thread's here are Jokers, Linkins', Grasshoppers' and i have one for mine too plus Linkin's 3LN6 FZR250

    I think your carby's need a better clean out, pilot jet is for starting and idling then is still used up just past 1/4 throttle, if that's partially blocked or somewhere through the pilot circuit then it'll be hard to start
    Blow compressed air into the pilot circuit on the intake side of the carb, small port and you should feel the air coming out the pilot jet hole in the bottom of the carby (with fuel bowl removed)
    Carefully remove mixture screw from below the bowl, with spring washer and o ring, then blow air in through the pilot (small port) on the intake side of carb again.
    You should feel air coming through the mixture screw hole too.
    Mixture screw can go back in if all is good, set them to 3 full turn's out (from gently seated) as a good starting point, warm the bike and tune the mixtures from there
     
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    Last edited: Sep 5, 2016
  5. CafeRacerNut

    CafeRacerNut Active Member

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    I have a sneaking suspicion that I'm dealing with compression issues:headbang:
    PO left the bike out in the rain and I'm scared water got into the motor and screwed up the rings.
     
  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Did it have spark plugs in it or not?
     
  7. CafeRacerNut

    CafeRacerNut Active Member

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    Despite the wiring being a total fudge up yes it has brilliant spark.
     
  8. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I mean, was the motor left out in the elements with no spark plugs installed? If yes, then I would be concerned about debris in the combustion chamber, as well as rust. The cylinder liners are iron and will rust. This happened to me when I had a 3LN motor apart and was cleaning before reassembling. I dried off the bores and wrapped them an old pillow case. Next time I looked at them there was surface rust.

    If there were spark plugs in the engine when you got it, I wouldn't be worried.
     
  9. CafeRacerNut

    CafeRacerNut Active Member

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    ooooooooooh yeah they were in there and surprisingly new too:dance2:
     
  10. CafeRacerNut

    CafeRacerNut Active Member

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    Hi guys does anyone have a wiring diagram for me, my wiring is a complete mess I decide to take the bike apart and start from scratch once my CBX/CBF 250 is done. I did some sketchy photoshop work to get an idea for the fzr. I was inspired by my Buell Xb12R Firebolt(horrendous piece of shite that it is).
    Fzr.jpg


    This is my Buell I love this bike but it is the most unreliable thing on wheels ever created and that includes a stainless steel wheelbarrow with a solid wheel.

    10408181_1568588430091752_8433460773747415319_n.jpg
     
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  11. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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  12. CafeRacerNut

    CafeRacerNut Active Member

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    I Checked out hte R6 Replica fairings they are properly gorgeous but they are shite expensive and I'm a student so nah and i want to fix up the loom for the same reason i wouldn't call it a budget build but I have a budget to stay in.
     
  13. CafeRacerNut

    CafeRacerNut Active Member

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    Here in South Africa we have an abundance of 250's because our license system works like this.
    Learner can drive anything up to 125cc but may not lift, once over 18 you may drive any size motorcycle with a learners.
    but you still may not lift. So loads and loads of first time riders buy up the 250's, slap a 125 sticker on it and jump to 400's or 600's after that. The most common 250 by far is the 250 Genesis all the breakers have them and there is quite a few with 3ln's. The kids these days opt for the newer 250's like the ninja 250r and the cbr and suprisingly the Ktm duke so nearly allll the 250's have ended up at some shop as a organ donor or at someone who thinks he is Valentino Rossi and wipes himself out against a taxi(South africa has dodgy taxi's). taxi-Custom.jpg
    One of many many riders taken out by this disease.:(
     
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  14. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Nice find, though I'd love to have fairing in the shape of the 99 R6 to fit my Fizzer
     
  15. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I'd like my actual 99 R6 back :(
     
  16. CafeRacerNut

    CafeRacerNut Active Member

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    Im looking to buy one in the near future there is an 02 model for sale here for 16 000 ZAR
     
  17. CafeRacerNut

    CafeRacerNut Active Member

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    Hi guys, I believe my compression is down and out on the FZR I want to pull the motor and check the following:
    • Valves
    • Valve Clearance
    • Timing
    • Rings
    Sleeves(for ridges)
    and lastly I want to see if the valves are sealing properly.
    The old 'finger on the hole' method revealed that 1 and 2 have more compression than 2 and 3 or at least it feels that way to me.
    Can you please tell me the torque settings for top and any other guidance or pro tips will be much appreciated.

    Side Note: She is a 3LN3 model
     
  18. CafeRacerNut

    CafeRacerNut Active Member

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    It had plugs in but no carbs on and the idiot didnt cover it up at all.
     
  19. CafeRacerNut

    CafeRacerNut Active Member

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    Cleaned the carbs out today, Never trust the previous owner I learned that today.
    Photo 2016-09-08, 15 54 34.jpg Photo 2016-09-08, 15 54 34 (1).jpg Photo 2016-09-08, 15 56 05.jpg Photo 2016-09-08, 17 39 08.jpg Last Photo is as clean as I can get them.
     
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  20. Murdo

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

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    Not as bad as some I have seen. So long as the jet passages are clean they should work fine.
     

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