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. jmw76

    jmw76 Well-Known Member

    Messages:
    748
    Likes Received:
    350
    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
    Great work. Keep at it. We are itching to hear it run.
     
    • Agree Agree x 1
  2. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    You aren't the Lone Ranger there Mate,,,,,,
    I was itching to start mounting the carbies, and associated linkages, but revisiting forward backwards land always seems to happen :idk:
     
    • Like Like x 1
  3. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    As we move into a new month, I'm pleased to see the end of July, which, for me, was a groundhog month, due to discovering the main bearing shells I used in one engine half were too snug, due to carelessness from a previous "repairer" who somehow managed to drop something pointy onto #4 crankcase main bearing area, under the bearing shell, resulting in a "dent" so minute, it could not be felt.
    I hit the area with some cardboard backed 1500 wet'n'dry, sat the crank in place & pulled the wet'n'dry thru until the invisible ridges around the ding were gone, this enabled everything to turn freely, but I thru a thinner set of bearing shells in, just to be safe.
    This project is my hobby, my job & my addiction , but there's no rush, so long as I do something to it every day I'm happy, when this is something I've not done to it previously, is icing on the cake.
    Why is it the wind picks up the day after an engine is stripped ?
    I need to figure out a starter, as there is not enough room 'tween the cylinder banks to fit the OEM starter, so I'm planning on making an adapter using a dead starter armature, it's bearings, two CB250 crankshaft cam chain sprockets, some 25H chain, & a CB250 starter, which is twice the OEM 250/4 starter & hopefully, has more torque.
    Windy , dusty days give me think tank days, and I think I'd better make a start on some exhaust pipes soon, 'cos startup is getting closer, day by day :)
    pipes.jpg
     
    • Like Like x 3
  4. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Cosy carby trial & starter motor drive thought day today, It feels good to progress into new territory for a change ;)
     

    Attached Files:

    • Nice Work Nice Work x 4
    • Like Like x 1
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    2,722
    Likes Received:
    1,162
    Trophy Points:
    818
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Damn that looks sexy, 8 velocity stacks - something which you'd usually see in an F1 car
     
    • Agree Agree x 1
  6. jmw76

    jmw76 Well-Known Member

    Messages:
    748
    Likes Received:
    350
    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
    Was there a reason why you didn't think about running straight intake runners and crossing them over. So each carb bank installed above the opposite cylinder head?
     
    • Agree Agree x 1
  7. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Room. or the lack of it, to cross the runners, they would need to be "squashed"
     
    • Informative Informative x 1
  8. gregt

    gregt Well-Known Member Premium Member

    Messages:
    280
    Likes Received:
    241
    Trophy Points:
    248
    Joined:
    Mar 26, 2016
    Gender:
    Male
    Location:
    Hororata NZ
    My Bike:
    many and varied
    What are the carbs ? If they're the Yosh things I understood they wouldn't go past 45 degrees.
     
  9. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Chinese copies :oops:
     
    • Like Like x 2
  10. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Iv'e been hacked, said the Guzzi V50 frame to it's new resident in waiting (I need to redo the intake manifolds using custom 85 degree mandrel bends, which also require a wee wait while they get made in SA)
     

    Attached Files:

    • Like Like x 3
    • Nice Work Nice Work x 1
    • Looks good! Looks good! x 1
  11. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Groundhog day returned, and passed, again,,,
    [​IMG]

    [​IMG]

    [​IMG]
     
    • Like Like x 2
    • Winner Winner x 1
  12. Fastfishes

    Fastfishes Member

    Messages:
    27
    Likes Received:
    10
    Trophy Points:
    13
    Joined:
    Sep 8, 2021
    Gender:
    Male
    Location:
    Durham UK
    My Bike:
    Gsxr250 GJ72 1985
    This is epic
     
    • Like Like x 1
    • Agree Agree x 1
  13. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Starter motor relocating week this week, while I wait for bits for the carb linkage construction,,I spend more time waiting, than building , although I get at least 3 hrs per day in the creation station :D
     
    • Like Like x 1
  14. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
    • Like Like x 4
  15. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
     
    • Like Like x 3
  16. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    I managed to turn 1 day , into 3 days, then day into night, but managed to get done, what I wanted to do,,
     
    • Like Like x 1
    • Love it! Love it! x 1
    • Nice Work Nice Work x 1
    • Looks good! Looks good! x 1
  17. thebeefsalad

    thebeefsalad Well-Known Member Premium Member

    Messages:
    354
    Likes Received:
    209
    Trophy Points:
    248
    Joined:
    Feb 28, 2015
    Gender:
    Male
    Location:
    San Antonio, Texas USA
    Whats the plan to get the output to the rear? Digging the structural wood :D
     
    • Like Like x 2
  18. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

    Messages:
    3,641
    Likes Received:
    2,027
    Trophy Points:
    898
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Wodonga
    My Bike:
    1987 Yamaha SRX250, Honda 1974 SL125 K1, Honda CB400SF (NC42)
    This thing should sound like 1/3 of an F1 car when it is finished... That would be the older more loved F1 Naturally Aspirated high reving machines... I am loving the work.
     
    • Agree Agree x 3
    • Like Like x 1
  19. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    I'm waiting for some kind person to donate their damaged MC19 crankcase 1/2's to the cause, seeing that cutting the block away from the gearbox results in destroying the gearbox case section,so cutting the gearbox section off would render the engine cases scrap, maybe, just maybe, could use one of the MC19 "left over" gearboxes I have,but I dont not have any "good" cases left. then thru a 90 degree 1/1 bizzo to retain chain drive ?
    Way back in high school, 1st form woodworking class (compulsory) I spent the whole year poking a chisel thru the bottom of an unfinished savory bowl, I ended up "borrowing" a classmate's reject bowl as my own to get some marks,,I took metalwork the following year,,,
    I'd like to retain the timber rear engine brace, but, as you know, it wooden handle,,,
     
    • Like Like x 4
    • Funny Funny x 1
  20. Gen

    Gen Well-Known Member

    Messages:
    249
    Likes Received:
    248
    Trophy Points:
    248
    Joined:
    Aug 16, 2014
    Gender:
    Male
    Location:
    50 K's from South Australia, in NSW
    My Bike:
    blown CBR250r
    Did you notice that my mind's eye thought the carby linkages "might" clear the tank (that does not exist,,yet), so once again,,I'll do some mods to the support bush (possibly just turn them 180 degrees)
     

Share This Page