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

Project A festering thought of building an 8 cylinder 500

Discussion in 'Other Projects - Other Bikes (non 250's)' started by Gen, May 6, 2021.

  1. thebeefsalad

    thebeefsalad Well-Known Member Premium Member

    Messages:
    349
    Likes Received:
    206
    Trophy Points:
    248
    Joined:
    Feb 28, 2015
    Gender:
    Male
    Location:
    San Antonio, Texas USA
    What the heck is a bizzo?
     
    • Funny Funny x 1
  2. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Anything that works, usually, it's a vision, nameless, formless & relies on taking a dump (where the best thoughts happen), but sometimes, bizzo plans can be created in the fart sack, in the moments just before falling asleep.
    This one might include a pair of Honda NT650V (or similar ) final drive bevel gears, a few thrust (tapered roller) bearings and a sprinkling of 5083 10mm alooominium plate & might live in the spot CBR250 front sprockets would normally live.
     
    • Like Like x 2
    • Funny Funny x 2
  3. Allan

    Allan Active Member Premium Member

    Messages:
    58
    Likes Received:
    71
    Trophy Points:
    188
    Joined:
    May 26, 2015
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tuross Head
    My Bike:
    Honda CB250RS
    If you replaced some of the wood with steel, I bet it steel wooden handle.
     
    • Funny Funny x 3
    • Like Like x 1
  4. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Come in spinnah
     
    • Like Like x 1
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,688
    Likes Received:
    1,142
    Trophy Points:
    818
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    @Gen - I noticed that you replaced some bearing shells

    Do you have any, both big and and mains [not installed obviously] that you could measure the shell width

    Did you manage to source MC19 shells locally or did you have get them from OS?
     
  6. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Main bearing shells 13.84 mm width (vernier measurement), I don't have any big end shells that I can measure,,
    Shells come up occasionally in Oz (I have a permanent ebay search which notifies me is they come up for sale)
    CMSLN usually stock them in Europe, as does wisicarcom in the UK, wemoto also, Omah at EXite may have some ?

    Highs 002.JPG gonads 006.JPG
     
    • Like Like x 1
  7. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,688
    Likes Received:
    1,142
    Trophy Points:
    818
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Awesome thank you - you're one of the few magical motorcyclists that measures stuff
     
  8. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    If only I had better eyes , back & a fountain of youth
     
    • Agree Agree x 1
  9. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,688
    Likes Received:
    1,142
    Trophy Points:
    818
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Hey it's really appreciated - I've asked so many questions on other forums for simple measurements that go unanswered or get silly answers

    If I can beg one further favour - a straight [down] on shot so that I can compare the groove width a yours are 1mm less wide than the FZR250 bearing shells, but that groove looks to be thinner
     
  10. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    It's blowing dust today Mate, when it clears, I'll open the shed & uncover the engine and find a few, line 'em up, and if you like, mic 'em, possibly tomorrow ?
     
    • Like Like x 1
  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,688
    Likes Received:
    1,142
    Trophy Points:
    818
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Just a photo of one with a ruler beside it would be most excellent - that width measurement is well past accurate enough
    The CBR250 service manual is the equal best I've read because it gives crankshaft measurement ranges, engine case bore measurement ranges and most importantly bearing shell material thickness ranges

    Whereas Yamaha only gives colours - which is leaving us guessing and trying to measure minute 4-5 micron tolerances - but I'll get there...eventually
     
    • Like Like x 1
  12. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    For ruckusman

    mc19 shells 001.JPG mc19 shells 004.JPG mc19 shells 004.JPG
     
    • Like Like x 2
    • Thanks! Thanks! x 1
  13. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,688
    Likes Received:
    1,142
    Trophy Points:
    818
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Perfect - thank you

    width will fit in FZR250 cases - tab location is similar if not identical, looks to be of similar width and the actual oil contact bearing face is close

    As it turns out, I researched the bearings that I have here as it isn't marked with paint, but does have a number stamped on it D2F A

    One hit that I got on google was a reference to CB350/CB400 bearing shells - so same OEM supplier for my FZR250 bearing as the Honda CB350 bearing
     
    • Like Like x 1
    • Winner Winner x 1
  14. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Someone got up before the spoggies again today,,,
     
    • Like Like x 1
    • Nice Work Nice Work x 1
  15. jmw76

    jmw76 Well-Known Member Premium Member

    Messages:
    738
    Likes Received:
    342
    Trophy Points:
    348
    Joined:
    Mar 12, 2017
    Gender:
    Male
    Location:
    Melbourne, Australia
    My Bike:
    Honda cbr250rr mc22 road + 1 track, Honda RC 162 tribute bike, Honda Spada Vt250, Honda CBR900RR
    Good stuff Gen. But what is the problem you are trying to solve? I might have missed an earlier post. Have the case halves moved a bit with the welding process?
    Keep up the good work.
    I am really looking forward to hearing this beauty run.

    Peter.
     
  16. Mike Green

    Mike Green Active Member

    Messages:
    101
    Likes Received:
    142
    Trophy Points:
    148
    Joined:
    May 9, 2020
    Gender:
    Male
    Occupation:
    Taking it easy
    Location:
    Auckland
    My Bike:
    Yamaha FZR250
    That thing is begging for fuel injection, simple intake runners to a central plenum and single throttle body. But carbs are cool
     
    • Like Like x 1
  17. thebeefsalad

    thebeefsalad Well-Known Member Premium Member

    Messages:
    349
    Likes Received:
    206
    Trophy Points:
    248
    Joined:
    Feb 28, 2015
    Gender:
    Male
    Location:
    San Antonio, Texas USA
    One of the journals had a gouge/highspot in it
     
    • Agree Agree x 1
  18. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Yep,,,

    rubbery.jpg
     
    • Informative Informative x 1
  19. Gen

    Gen Well-Known Member

    Messages:
    238
    Likes Received:
    239
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    I was worried about crankcase distortion due to welding heat also, but lucky for me, I have a boilermaker mate, who actually thinks,,,he worked around the cases bit by bit, to minimize any distortion, the only problem was that the cases from 2 engines were married, they moved .007" closer together (between crank centers)

    Be very careful buying **** from a wrecker, a previous owner / abuser seemed to enjoy dropping heavy parts onto machined surfaces, and,,,,doing bolts up until the threads stripped
     
  20. Mike Green

    Mike Green Active Member

    Messages:
    101
    Likes Received:
    142
    Trophy Points:
    148
    Joined:
    May 9, 2020
    Gender:
    Male
    Occupation:
    Taking it easy
    Location:
    Auckland
    My Bike:
    Yamaha FZR250
    I hear you. I've looked over a few FZR250 engines in the process of making my project and it's horrifying what has been done here and there. Especially considering what little jewels these engines are. Of course they are practically worthless now so not many people are willing to spend time or money on them, except us loonies.
     
    • Agree Agree x 2
    • Like Like x 1

Share This Page