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

Project Fuel Injected Turbo FZR250, half

Discussion in 'Your 250cc Projects' started by Mike Green, May 9, 2020.

  1. Mike Green

    Mike Green Member

    Messages:
    43
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    May 9, 2020
    Gender:
    Male
    Location:
    Auckland New Zealand
    My Bike:
    Yamaha FZR250
    Little project that I've been working on for about 20 years now. In the middle of a rebuild after it dropped both exhaust valves in one cylinder.
    Engine is cylinders 3&4 only. 1&2 have been cut off and the end of the block and head blanked off. Originally ran an Ecotrons engine management system kit for a GPz250. The twin throttle body plugs straight in. The kits are very reasonably priced and after a bit of fiddling it was up and running.
    Due to suspected problems with the system I upgraded to a Link Atom engine management system. The turbocharger is an IHI RHB31A. The motor pulls boost from about 10000rpm. Best power to date was 32rwhp.
    One interesting part of this project has been finding all the differences between the original 2KR base motor and the new motor based on a 3LN FZR125 side1.jpg
     
    • Winner Winner x 3
    • Like Like x 2
  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,202
    Likes Received:
    962
    Trophy Points:
    693
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    You've got to be introduced to @gregt - also from your side of the pond and it seems imbued with the same sense of ingenuity

    Is is something in the water over there?

    WHOOPS, where are my manners

    Welcome

    :welcome:
     
    • Like Like x 1
  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,206
    Likes Received:
    2,316
    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
    Welcome to the forum
    And nice work
     
    • Agree Agree x 1
  4. Mike Green

    Mike Green Member

    Messages:
    43
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    May 9, 2020
    Gender:
    Male
    Location:
    Auckland New Zealand
    My Bike:
    Yamaha FZR250
    I've met Greg. Collected a couple of unused spare 3LN motors just before Christmas for my rebuild
     
    • Like Like x 2
  5. Gen

    Gen Well-Known Member

    Messages:
    95
    Likes Received:
    75
    Trophy Points:
    203
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Another saw handy motorcycle enthusiast , well done .
    How's the balance now ?
    Some build pics would be nice :thumb_ups:
     
  6. Brandon Otte

    Brandon Otte Member

    Messages:
    137
    Likes Received:
    24
    Trophy Points:
    43
    Joined:
    Feb 29, 2020
    Gender:
    Male
    Occupation:
    Plumber
    Location:
    Hamilton, New Zealand
    My Bike:
    Yamaha FZR250 2KR 88
    Hi, do you have a video on youtube of the 2 cylinder by any chance? I seem to recall seeing one.
     
  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    4,006
    Likes Received:
    2,657
    Trophy Points:
    923
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    Welcome and great work.
     
    • Winner Winner x 1
    • Informative Informative x 1
  8. risky

    risky risky

    Messages:
    4,366
    Likes Received:
    1,130
    Trophy Points:
    923
    Joined:
    Nov 4, 2012
    Gender:
    Male
    Occupation:
    risky by name AND actions
    Location:
    newcastle,australia
    My Bike:
    honda ca77, megelli x2,fzr yamaha x 5 ,maxim,cb750.cb600 hornet,zxr250,marusho magnum electra.
    welcome.
     
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,206
    Likes Received:
    2,316
    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
    • Thanks! Thanks! x 1
  10. Murdo

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

    Messages:
    5,607
    Likes Received:
    4,244
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1938 Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, plus a few others.
    Welcome back.
     
  11. Brandon Otte

    Brandon Otte Member

    Messages:
    137
    Likes Received:
    24
    Trophy Points:
    43
    Joined:
    Feb 29, 2020
    Gender:
    Male
    Occupation:
    Plumber
    Location:
    Hamilton, New Zealand
    My Bike:
    Yamaha FZR250 2KR 88
    Is this yours?
     
    • Like Like x 1
  12. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,206
    Likes Received:
    2,316
    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
    And another

     
  13. Mike Green

    Mike Green Member

    Messages:
    43
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    May 9, 2020
    Gender:
    Male
    Location:
    Auckland New Zealand
    My Bike:
    Yamaha FZR250
    This one is with it fuel injected using the Ecotrons system but no turbo:
     
    • Like Like x 1
  14. Mike Green

    Mike Green Member

    Messages:
    43
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    May 9, 2020
    Gender:
    Male
    Location:
    Auckland New Zealand
    My Bike:
    Yamaha FZR250
    The balance seems fine. Basically it is a 180degree twin. I've ridden it a few times and thought it was fine.

    The build has been documented on Kiwibiker starting about here: https://www.kiwibiker.co.nz/forums/showthread.php/68694-6/page51.

    The bike, #6, has had a couple of engines over time. Prior to the FZR engine I had Honda MB100 engines in it
     
    • Like Like x 1
  15. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

    Messages:
    2,692
    Likes Received:
    1,378
    Trophy Points:
    823
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    Spada & VT250F
    Welcome
     
  16. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,202
    Likes Received:
    962
    Trophy Points:
    693
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    I'm a bunch of pages into the kiwibiker thread - <DARTH VADER MODE> HMM, Impressive! </DARTH VADER MODE>
     
  17. Gen

    Gen Well-Known Member

    Messages:
    95
    Likes Received:
    75
    Trophy Points:
    203
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    hypo.jpg
    I also enjoy cutting tools & speed
     
  18. Mike Green

    Mike Green Member

    Messages:
    43
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    May 9, 2020
    Gender:
    Male
    Location:
    Auckland New Zealand
    My Bike:
    Yamaha FZR250
    • Thanks! Thanks! x 1
  19. Gen

    Gen Well-Known Member

    Messages:
    95
    Likes Received:
    75
    Trophy Points:
    203
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
     
    • Like Like x 1
  20. Mike Green

    Mike Green Member

    Messages:
    43
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    May 9, 2020
    Gender:
    Male
    Location:
    Auckland New Zealand
    My Bike:
    Yamaha FZR250
    I cut the new cylinder head using my drop saw with a new 60T blade. Nervous to start with but it went through it like it was made for it. Made nice chips and everything. I love these little 250 Yamaha engines. Considering the abuse and lack of maintenance inflicted on them they seem to do OK. Pistons and bores have practically no wear. There is often a scorched bearing on the crank somewhere but the crank bearing surface has been good so far. The heads suffer a bit but I think that's down to the shops not wanting to work on them and riders simply not doing maintenance, valve clearances tighten up and valves and seats get overheated due to leakage. Every head I have looked at has had bad problems with valve sealing and often a dropped valve though I'm not sure what has been causing that. One possibility is the lack of spring pressure. Every spring I have checked is not at the correct installed height.
     
    • Like Like x 1

Share This Page