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Thread: Old multi-cylinder bikes of the 50s to later on. Japanese, British, Euro, etc

  1. #46
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    Quote Originally Posted by chrisc View Post
    The actual bike or just the photo online?

    Because I would LOVE to see this in the flesh. I have a real soft spot for early 50cc racers
    Just the Photo, i can't see how it is a square 4 though even though that is what the blub said?
    The handling i assume was way way down the priority list, at the time, as well as the tires, suspension, ergonomics and economics etc.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  2. #47
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    Quote Originally Posted by husaberg View Post
    Just the Photo, i can't see how it is a square 4 though even though that is what the blub said?
    think its a typo, its more a V4 twin crank... but honestly its two twins joined up

    Click image for larger version. 

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    cheers DD
    (Definately Dodgy)



  3. #48
    That's what a square 4 is - 2 cranks geared together.
    In and out of jobs, running free
    Waging war with society

  4. #49
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    Quote Originally Posted by Motu View Post
    That's what a square 4 is - 2 cranks geared together.
    Not always. Some v-fours are the same way.

  5. #50
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    Quote Originally Posted by Motu View Post
    That's what a square 4 is - 2 cranks geared together.
    in a square formation though.............
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  6. #51
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    Quote Originally Posted by husaberg View Post
    in a square formation though.............
    A zero degree v four then?
    Stock is best

  7. #52
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    Quote Originally Posted by Henk View Post
    A zero degree v four then?
    ? 90?
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  8. #53
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    The angle of the V on a two stroke is not relevant is it? They don't share a crank pin between cylinders, so the V is just for making space.

    There wouldn't be a great deal of gain one way or the other. to time the firing strokes oddly with two cranks or one.

  9. #54
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    Quote Originally Posted by Drew View Post
    The angle of the V on a two stroke is not relevant is it? They don't share a crank pin between cylinders, so the V is just for making space.

    There wouldn't be a great deal of gain one way or the other. to time the firing strokes oddly with two cranks or one.
    Yes and no the firing order is also semi dependent on the V angle as well in a single crank setup.
    The single vs the twin cranks has it pro's and cons.
    From memory Honda ended up at well over 100 (113?)degrees.With a short but wide engine and a balance shaft.
    But power productive short straigh intakes and tidy airbox set ups
    The twin contrarotating cranks have plus and minuses in high HP applications, as they have no hunting tooth in the primary drive.
    Yet can be narrower but are less neat in execution more problematic in packaging potentially heavier and so forth.....


    as for gains with firing orders Honda had them when the tires were not so great with the 2 up firing order and finally the big bang.
    These advangages were nullified with traction control and with improved tires.
    But this is my Fav Narrow angle V set up the Derbi 125
    Last edited by husaberg; 15th May 2013 at 20:21. Reason: it was 112
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  10. #55
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    its really a double tandem twin, think 2 x kr250's side by side
    My neighbours diary says I have boundary issues

  11. #56
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    Quote Originally Posted by Yow Ling View Post
    its really a double tandem twin, think 2 x kr250's side by side
    What is? A square 4 is?

    The Suzuki we are talking is well not really?
    Maybe at best its two Tandams side by side and then Twisted apart 90 dergree's




    come on do you have one in the garage, you probably do.........the road engine was a fair bit uglier.

    I was thinking it was Stepped but that was the RG500. THe Honda single crank is prettier in My opinion shame it isn't case reed
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  12. #57
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    Its not hard people a 'square' is just that 4 pots in a square format ie: the Ariel and RGB only avaible with twin crank, a V is in a vee format either single or twin crank... if a twin is parallel I only know of single crank but if a tandem twin then it has to have 2 cranks... as Yowling says the RS67 is a weird set up more like 2 tandem twins... or is it more two parallel's with two cranks... shit sake give me a V2 and be done with it
    cheers DD
    (Definately Dodgy)



  13. #58
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    Honda RS500 I will add more when i can be arsed later....
    It was a real clever little engine.
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    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  14. #59
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    Quote Originally Posted by husaberg View Post
    What is? A square 4 is?

    The Suzuki we are talking is well not really?
    Maybe at best its two Tandams side by side and then Twisted apart 90 dergree's
    Um it is actually a square 4

    The write-up from when it was produced states:

    250cc 4 cylinder
    using parallel crankshafts, two diagonally opposed cylinders fire together
    produces 52hp @ 12500rpm
    22mm bore carbs feeding disc intake valves
    multi plate dry clutch

    and it was raced in 1964-65 albeit not very successfully with being notoriously difficult to tune & also heavy

    Yamaha made a 250 V4 8spd a bit later at the end of 65 revealed it at Monza, produced 60hp. And at the IOM was clocked at 150mph.
    It was essentially two of the 125 engines grafted together on a common crank.

  15. #60
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    Not quite 1950s but my old man has loaned me his '77 Kawasaki Z650 while I'm in Australia for his wedding. I'm surprised how hard it goes, it even gets through corners quite quickly.
    Carbs are a bit dodgy and need to be cleaned and synced and it uses a bit of oil but very much "old school cool"
    Gotta ride to Sydney tomorrow (3.5 hours of fun roads cos I'll be going the back way) I'll snap a couple of pics and post them up when I get there.

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