1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Project 3LN1 Restoration

Discussion in 'Your 250cc Projects' started by camarda, Mar 22, 2020.

  1. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,225
    Likes Received:
    1,415
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    BTW worth mentioning if there's really black oil and signs of varnish from burnt oil residue when looking into the oil filler hole then you can add a hundred ml of diesel to the oil and run it for 10-15 minutes on idle to clean out the engine before changing it

    There's a formula for something called seafoam which is either kerosene or diesel @ about 60% plus isopropyl alcohol @ 15% and shellite @ about the final 25% which can go through the oil prior to change instead of just straight diesel, it does great work in dissolving built up oil varnish.
    It is also recommended for putting through cylinders to free up carbon gunked rings, but that's not something which you have to tackle without good cause
     
    • Informative Informative x 1
  2. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Ok thanks so much will do all that soon and let you know as I go. I have somewhere I can try it haha idk if they will see me as it’s not registered. It also has no brakes right now so I can’t try it yet regardless. I’m currently rebuilding them though (some pitting on the pistons/plier marks from whatever idiot last rebuilt them and need to order new seals/ sorting pistons from the guy im getting the airbox off ).

    I seem to be confused how to check the fuel level in the carbs. I checked the guide and it doesn’t seem to have instructions I can find, if you have a link to somewhere this is clearly laid out that would be appreciated.

    Also, should I buy 4 of these (for each appropriate carb) to rebuild them and does this include everything that’s needed.

    D5218D7B-C690-4752-9B20-C6B6A48C46C8.png
     
  3. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Noted, will do this, I have got a new oem fuel filter. What oil runs best in these, price isn’t a factor.
     
  4. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,225
    Likes Received:
    1,415
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    That may be the parts you need, BUT because yours has another set of carbs they may be from a 3LN3 - which has differences in the carbs.

    Trying to think if there's an identifiable difference on the outside - @GreyImport OR @my67xr OR @Linkin might have some advice in that regard.

    There are parts inside which will tell us the difference if perhaps you have 3LN3 or 3LN5 carbs - there are jet differences as well as differences in the seal kits.

    Identifying Carbs

    The table on this page has the differences in the jets
    https://www.2fiftycc.com/index.php?...8-26mm-carb-settings-specs-3ln-3yx-zeal.9787/

    @maelstrom does full seal kits here
    https://litetek.co/Carb_Kit_Yamaha_FZR250_3LN1.html

    Fuel level
    This shows the fuel level measurement, as I explain in the post, there isn't any fuel in the photo, however it should be 9.2mm above the casting line on the carbs float bowls - this 9.2mm measurement is for 3LN1 carbs, 3LN3 carbs run 10.5mm fuel level, which is why it's important to know which ones you have

    It is really easy to check - just needs a short length of clear tube which goes over the float drain hole
    https://www.2fiftycc.com/index.php?threads/first-bike-the-fzr250-3ln.10816/page-3#post-130275

    I am going to speculate and say that there may be a difference in fuel level between having a fuel pump and not having a fuel pump - for now just check it and let us know the measurement

    Carb rebuild thread
    https://www.2fiftycc.com/index.php?threads/fzr250-3ln1-carb-service-and-tune.3547/

    While I think of it, check the fuel filter in the tank - details here
    https://www.2fiftycc.com/index.php?threads/fzr250-3ln-fuel-system.1804/
     
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,225
    Likes Received:
    1,415
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Many of the people here are very satisfied with Delo 400, I made the suggestion many years ago after reading a thread on netrider

    Link to my post and the original thread on netrider
    https://2fiftycc.com/index.php?threads/what-oil-do-you-run-in-your-fzr-250.1877/#post-15595

    The moral of the story is use a very good quality oil, which Delo 400 is, and change it regularly, I used to do them about 3K kms because the little 250's rev so high and the transmission chomps the oil molecules
     
  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

    Messages:
    10,914
    Likes Received:
    6,708
    Trophy Points:
    1,168
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Between a Rock and a Hard Place
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Yamaha FZR400 *Triumph Bonneville 750 T140V *Triumph Daytona 675 *Triumph Tiger 800XC
    They are 3LN1 carbys

    Idle knob.jpg


    carbs.jpg
     
    • Like Like x 1
    • Love it! Love it! x 1
  7. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,225
    Likes Received:
    1,415
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    • Funny Funny x 1
  8. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Thankyou, you guys are awesome, before I order anything do you think I need both the litec seal kit and the rebuild kit or is just the rebuild kit enough for now. (Keeping in mind shipping from overseas might be delayed due to Covid and the rebuild kit is in aus). I’ll have fuel level details and more updates soon but due to the nature of my work (Woolworths supermarket) I’m unable to be at home isolating.


    Sent from my iPhone using Tapatalk
     
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,313
    Likes Received:
    2,383
    Trophy Points:
    898
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's , 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G, 1976 IT400C 510
    The Keyster kit's will get you by for now, but the Litetek seal's will last you for a lifetime

    When you buy the Keyster kit's make sure you order 2 inner kit's and 2x outer kit's for the 3LN1
     
    • Agree Agree x 1
  10. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,225
    Likes Received:
    1,415
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Buddy, you're working at Woolworths, you're a national hero and I'm not being facetious - I salute you!

    If you want to to the carbs properly, definitely get the seal kit @maelstrom can advise if there are any delays with shipping because of Covid 19.

    In reality the only part that you will require from the carb rebuild kits is the emulsion tubes, IF yours are worn - many have kept the original needles as they are harder and wear less - as for the rest, jets don't actually wear out and unless yours have been mangled by the previous owners, solvent cleaning will suffice.

    The float needles - the rubber at the tips hardens and gets micro cracks - @my67xr measured that there are differences with the spring tension between OEM and the keyster kit float needles - fuel level can be measured and if necessary float heights can be adjusted to suit.

    Once you've got the parts, we'll take you through the carb reconditioning to ensure that you avoid some of the pitfalls and get them perfect.
     
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,102
    Likes Received:
    3,472
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    At the moment we are told by DHL to expect delays and there is no shipping to China, Italy and a host of African countries. Thai Post are not saying anything and there may be some sort of delays with Aus Post. I think that having leaking pilot merge chamber o-rings will seriously mess up the running of the bike but that has not been proven by independent research.
    Cheers
    Blair
     
    • Like Like x 2
  12. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Hahah thanks. Some people are appreciating it, others are just raging about empty shelves, oh well...

    Alright as I was going to eventually use them anyway I may as well get the litetek kit now. So, I’ll order this , anything else I should get from here while I’m making an order?


    [​IMG]


    And, emulsion needles? Maybe I should just take the carbs apart and show you pics and if you can let me know what I need as I don’t really know what each part does yet or how the whole thing works, or what they are meant to look like if they aren’t worn etc etc. Then I’ll get together a list of what metal parts I need.

    I’m thinking of buying an ultrasonic cleaner to clean the carbs up, I want one anyway so may as well get it now.


    Sent from my iPhone using Tapatalk
     
  13. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Anyone here also got a source for good brake Caliper seals.
     
  14. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    I may as well get the litetek ones so I don’t need to build them twice haha.


    Sent from my iPhone using Tapatalk
     
    • Like Like x 1
    • Agree Agree x 1
  15. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,225
    Likes Received:
    1,415
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Are the brake caliper seals kaput?

    Some may have found them, they ARE very expensive
     
  16. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,313
    Likes Received:
    2,383
    Trophy Points:
    898
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's , 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G, 1976 IT400C 510

    There's a few piston seal kit's on ebay, not sure if @Andych bought these or not ?
    Here's one- https://www.ebay.com.au/itm/Front-C...589741?hash=item3f17fff3ed:g:11cAAOSw0IBecPvb

    Measure your seal's and double check with the seller that these are correct for your bike
    There are 4x dust boot's and 4x piston seal's



    Genuine Yamaha part number is for the seal kit is 3LN-W0047-00
    The front brake caliper's, piston's and seal's are the same for all the 3LN's
    https://en.impex-jp.com/catalogs/mo...-white-20530/front-brake-calliper-818750.html

    [​IMG]
     
  17. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Thanks guys, I need to replace all the pistons too as they are pitted beyond usability. And yea all the seals are kaput. Got someone with parts sending me a piston set hopefully and I’ll suss those eBay seals, found some that look super high quality for 110. The genuine ones are about 90 per caliper.

    Here’s a pic of the brakes right now, they were all gunked up and ceased but the calipers are in tact and I cleaned them back to new on the inside. Will remove the paint soon from the outside. [mention]GreyImport [/mention]which white knight paint did you use to make yours red, I may as well paint them before I put them back on but i won’t do any other aesthetic mods yet as you suggested. Also, how did you make the brembo stencil ( I assumed you used a stencil). Also, any other advice for how you painted them so nicely.

    [​IMG]
    [​IMG]


    Sent from my iPhone using Tapatalk
     
  18. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Also guys, I’m going to order the litetek seal kit tonight. [mention]maelstrom [/mention], if you have any way of express posting I’m happy to send extra on PayPal for this as i wanna get started ASAP. Thanks heaps. [mention]ruckusman [/mention]if I disassemble the carbs is it ok if I send pics of the parts and you can tell me what to replace so that I will have it all before the seal kit arrives, cheers.


    Sent from my iPhone using Tapatalk
     
  19. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,102
    Likes Received:
    3,472
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
  20. camarda

    camarda Active Member

    Messages:
    98
    Likes Received:
    24
    Trophy Points:
    78
    Joined:
    Mar 22, 2020
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    1989 FZR 250
    Thanks, I’ll see if I eventually just go for the genuine ones or eBay ones. If anyone else has any experience with the eBay ones let me know.


    Sent from my iPhone using Tapatalk
     
Tags:

Share This Page