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New Member New Member 3LN1 FZR250R

Discussion in 'New Members Say Gday' started by HSGRX7, Feb 3, 2023.

  1. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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  2. HSGRX7

    HSGRX7 Active Member Premium Member

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    So i got keyster kit, all needles say y471 ? In all 4 kits not 5ct7 5ct9
    Everything else looks correct its the 3ln1 kit and got the 2 separate kits for outer inner carbies
     
  3. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    That's most curious, I did have 4 keyster kits but I lost them off of the back of the ute so can't offer any assistance with the needle numbers.

    My OEM needles don't look to be worn, however the OEM emulsion tubes are a horror story.

    Given that they have two distinct tapers, you could either measure with a micrometer to compare between them or put a razor blade against your OEM needles and hold them up to the light to see if they are worn.
     
  4. HSGRX7

    HSGRX7 Active Member Premium Member

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    i just left the needles alone, the china kit had 5ct7 5ct9s so just left them in they are brand new.

    great success, it seems to be running "for now" see if it lasts tomorrow morning and doesnt change..
    i guess the floats weren't at 16mm and now they are.
    mixture i thought was 1.75 not 2 turns so i redid that aswell.
    turned it off and on afew times and also stalled it afew times and it fired back up fine which is what it was having trouble with before.

    still idles abit high and keeps changing as you ride it and stop. Another issue i have is the airbox just doesn't want to stay on the carbies and its not sealed.


    what does your bikes sit at temp wise? quarter? fan didnt kick on yet was around quarter.
     
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  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    OK, if you've got a combination of 5CT7 & 5CT9 read this as you don't need a shim beneath the centre 5CT9 needles

    https://www.2fiftycc.com/index.php?...settings-specs-3ln-3yx-zeal.9787/#post-112136

    Use some heat and a little red rubber grease on those airbox rubbers - they are very hardened after over 30 years and can be a PITA, if they're leaking on and off from the airbox moving it will cause slightly erratic running.

    I used to experience the "it's running good today" versus "it's dogging me out today' A LOT before @GreyImport discovered the keyster kits.
    I spent a lot of time chasing fuel levels when it was worn emulsion tubes all along.
     
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  6. HSGRX7

    HSGRX7 Active Member Premium Member

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    I didn't receive a response from motorcyclespareswarhouse about the needles in the keyster kit, ive tried again and will see if i get a response this time..

    what numbers are supposed to be on the emulsion tubes? if they are right i might just put them in with the china jet needles which are 5ct7 5ct9.

    The bike passed roadworthy with no issues and is now fully registered.
    still idles abit high but is running pretty good otherwise, new brakes have freed up a fair bit too.
    temp runs about quarter on temp gauge, fan comes on about half way, only when idling it creeps up really. just did a couple laps in 32c and was quarter the whole time.
    usually starts up first go but has had afew times where it takes a good few minutes to start in early mornings.

    what sort of KM do you guys get out of a tank? i got 111km before needing to use reserve. i know fuel economy was an afterthought with these just wondering if mines about right or not.
     
  7. HSGRX7

    HSGRX7 Active Member Premium Member

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    Xl250 motorsport currently
    0E12F9F4-D2F2-42C5-8EC1-00734BB7BEE4.jpeg

    B078CD07-2C36-48E6-8309-2AC0628EE684.jpeg
     
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  8. HSGRX7

    HSGRX7 Active Member Premium Member

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    Hi,
    ive put the keyster kit and litetek gaskets/orings in it now.

    looking to balance the carbies now just trying to find out which carby is the master carby or a service manual to be able to do it
    found one for a fzr400 in english would that be good enough or they completely different?

    thanks
     
  9. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    The master carby should be the one where the throttle cables attach too. #2 or #3 on the FZR250 3LN
     
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  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Ive always used #2
    Balance 1 and 3 from 2 , then 4 from 3
     
  11. HSGRX7

    HSGRX7 Active Member Premium Member

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    Thanks guys
     
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  12. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I recently balanced the carbs on a YZF600, Keihin carbs, so different in that respect, but same process.
    It was idling like a lopey V8, just horrible.
    Carbs 1 & 2 were mildly out of sync between them, as were carbs 3 & 4, but the pairs of 1 & 2 and 3 & 4 were way, way out.

    So I matched the paired carbs between themselves 1 & 2, then 3 & 4, then both sides - some fiddling back and forth
    So it went outside left, outside right, middle, then continue to refine

    Adjustment of the idle was necessary during the process.
     
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  13. HSGRX7

    HSGRX7 Active Member Premium Member

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    did the valve clearances on it, 3 were out of spec with one completely closed, rest were at minimum or perfect.

    Thanks for the write up on valve clearances ruckusman helped alot. done them on a single cylinder before but the fzr was abit daunting.

    still can't balance the carbies as it still has an air leak somewhere, I've pulled off the intake boots off and sealed them again, still leaking somewhere
     
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  14. HSGRX7

    HSGRX7 Active Member Premium Member

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    Hi guys.
    Been riding the bike around for awhile relatively problem free.
    Broke my car so currently have to daily it. Which the where the quirks it has currently are getting very old very quickly..
    Bought a new (to me) airbox that was crack free.
    Peter stevens motorcycles was able to source New carby to manifold boots from yamaha in japan, Aswell as carby to airbox boots.
    They made quite a large improvment on the bike running.
    Starts without choke only and starts idling by itself after a couple seconds cold at a reasonable rpm unassisted which it never had before.
    That flooding issue is gone finally.

    issues i have with it now is, it is quite hit and miss with starting up. Can first straight up no issue but if it misses the first try it’s very difficult it get it to start. Often bump start it. Once its been running at all its fine.

    Other thing is Also at full throttle at about 14-16rpm it starts to lose power and slow down but back off on the throttle slightly it picks up and accelerates, just wondering if anyone’s experienced that before?
    Not very familar with the exup system but read sometimes thats an issue?

    Idle does go up abit after riding, sometimes it is not a steady idle so guessing it may still have an airleak somewhere.


    Got new spark plugs to put back in on the weekend, wouldn’t start with them initially after doing valves but ended up been coolant got in the electric plug.

    Other than the starting its been great.


    IMG_4704.jpeg
     
  15. jakeyphil

    jakeyphil Active Member Premium Member

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    Does this dip sound similiar to the 'chugging' in this thread?
    Help - I found something weird... 3LN3 | Page 3 | 2FIFTYCC.COM - Home of the Quarter Litre

    Also can you shed some light on those fairings? They look to be in too good condition to be originals, are they the thermoplastic repros found online? If you have any indication of where they were bought I'd be very interested in that info, I need a set of fairings for my 2kr and those look to fit quite nicely.

    Cheers
     
  16. HSGRX7

    HSGRX7 Active Member Premium Member

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    Nah not really. i was just reading that thread earlier, it used to do that "bog mode" but not anymore.
    linkins carboned up top end comment might be worth a try.

    with the fairings i have no idea sorry. looks like they have been painted and stickered with clearcoat over the top. was a little bit of overspray on the cowl vents. might be from here Fairings Kits For Yamaha FZR250 1986-1989 (fairingmaster.com)
     
  17. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    If you are losing power at high RPM, first thing to check is fuel flow. Most likely a clogged fuel filter or a kinked fuel line if the arrangement of fuel lines etc has deviated from standard. Check that the fuel tank cap and breathers are working.

    The chugging problem however is different, it's an excess of fuel that causes the bike to be unable to rev out from idle, or it will stall, flood, or otherwise have low rpm problems. The suspected causes are merge chamber bung o-rings and emulsion tube/needle (jet needle / needle jet). A short term solution for that problem is to turn off the fuel at the tap and wait until it clears and you are moving, then turn fuel back on.

    In my experience, the worn needles and emulsion tubes cause poor low end performance and excessive fuel consumption, I think I got 80km from 10L of fuel at one point. After doing the carb overhaul and properly setting the mixture screws it was a new bike.

    Note you can have multiple issues going it once - it's entirely possible to have a clogged fuel filter causing high rpm issues, as well as worn out bits in the carbs causing excessive fuel usage.
     
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  18. HSGRX7

    HSGRX7 Active Member Premium Member

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    When i got the bike i replaced the fuel filter with a new one, i have since changed it to a larger one but maybe the flow isn't as good as i don't recall it doing it before. will switch it back see if that improves.
    hopefully the local motorcycle shop got one of those filters you linked in that thread VF201 - INLINE FUEL FILTER 8.5MM OEM STYLE 5/BAG (mcsonline.com.au)
    The one i had on it was similar but a super cheap auto one. swapped it to a larger one thinking it'll just get blocked, maybe shouldn't have.

    Bike has no performance issues down low or anything now.
    The worst i got was 111km out of a tank without reserve. filled it up yesterday did around 65-70km i think and filled it again today only put just over 4L in it. and wasn't really cruising k's.
    Not sure what km out of a tank these should be getting.
    That chugging issue drove me insane, very happy its gone.
     
  19. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    That supercheap filter, was it the clear type with orange coloured filter element? If so, I've had issues with those clogging up in short order on every bike I've used them on, so I no longer use them. I get OEM or OEM replacement.
     
  20. HSGRX7

    HSGRX7 Active Member Premium Member

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