RD 400 Daytona Special.

Discussion in 'Road Warriors' started by svs, Nov 21, 2011.

  1. welder

    welder Long timer

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    I had a 75 - rd350, 77 - rd400, 79 - rd400 daytona special and a 90 rz350 (with 63hp!). Some of the best fun I ever had was on those old 2 smokers. Seemed crazy fast at the time, but a Kawasaki ex500 has similar performance numbers. Still have a soft spot for the rd's though.
    #21
  2. skatetokil

    skatetokil SuperHack

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    Ok so everybody wants a 2 stroke direct injection motorcycle but nobody will build one... Anybody have any ideas for how to prototype one of these puppies?

    Did some back of the napkin math and a 12000rpm 250cc cylinder would need a minimum 33-35 lb/hr injector which is readily available but Yamaha claims their outboard system runs fuel at 800psi which is more of a problem. That's likely more than you could do with an electric fuel pump. Probably need a 2stage electric feeding a crank driven triplex off a small pressure washer.

    The other issue is getting lube oil to the top end. Yamaha has special beveled rings that are supposed to let some oil through which is an elegant but patented solution. Any other ideas?

    Also would there be any real benefit to running an expansion chamber on a di 2 stroke?
    #22
  3. seantx

    seantx Been here awhile

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    This is what I lusted after while everyone else my age was clamoring for GPZs and 1st gen Ninjas. Not the same, I know, but still tons of mosquito-slaying cool.

    [​IMG]
    #23
  4. Mobiker

    Mobiker Long timer

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    I still lust after them :thumb
    #24
  5. seantx

    seantx Been here awhile

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    Me too. :D Getting hard to find and though I haven't checked, I'm sure sourcing anything other than engine parts would be a challenge.
    #25
  6. oalvarez

    oalvarez Resident Raggamuffin

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    i've looked....they're out there, albeit far from the photo shown above.

    what's worse is that i owned one (a perfect one) back in the late 80s early 90s.....but the red/white/navy blue version....either way, a mistake to have sold it.

    rather have a 400 Daytona any day though....
    #26
  7. SocalRob

    SocalRob Long timer

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    I had an early 350 that would foul one plug and eventually holed a piston. Turned out a 10 cent oring modification fixed it. The original washer/o ring seal on the crank that kept the transmission oil out of the bottom end did not take into account the keyway. Yammi fixed that, I installed it on my bike, and never a fouled plug again.
    #27
  8. welder

    welder Long timer

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    [​IMG]Up here in Canada we got the 1980 rd400G. same as a Daytona but with different decals
    #28
  9. JerryH

    JerryH Banned

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    Why does everything have to be modern? I would like to have one just the way they were in 1979. I love 2 strokes, carbureted, air cooled 2 strokes. I have a Yamaha Vino 125 scooter. It will get you there, but it is drop dead boring. Just kind of hums along. Kind of like a dishwasher. I rode a Genuine Rattler 110, and it was very little better. Very quiet and smooth. At least it had a very faint 2 stroke sound, and if you stood behind it, you could get a faint smell of 2 stroke exhaust. Then I rode a Genuine Stella. WOW!!. It is in my garage right now. I bought it on the spot. It had a loud 2 stroke sound, it rattled and buzzed, 2 stroke smoke came out of the exhaust, it has a clunky manual 4 speed gearbox. It is not fast, though it will wheelie off the line, because all the weight is in the back. But it has all the noises, vibrations, and smells an old 2 stroke should have. Probably because it is an old 2 stroke. 40+ year old design. And it feels just like riding a 40 year old scooter.

    Not a 2 stroke, but I was interested in a Royal Enfield about 10 years ago. Yes, they were poorly built, but they were still the original design. Just like the Stella, a brand new 50 year old bike. Now they have totally ruined them. About all that is left is the look. the new unit construction engine, electric starter, and worse yet fuel injection. What good is a motorcycle if you can't play with the carburetor? I have not ridden a new one, but I'm betting it's pretty bland.

    I do own an '09 EX500, and while I am happy with it's power and performance, it to is lacking in most of the things a real machine should have. It is so smooth it might as well be electric. What it needs is a heavy dose of CHARACTER. And less plastic.
    #29