Didn't need it... but had to have it!! '76 DT400

Discussion in '2 smokers' started by Bugsy, Nov 19, 2012.

  1. Bugsy

    Bugsy Adventurer

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    I've been on the prowl for a mid '70's DT for awhile so when one popped up in a local ad, I couldn't help myself. It seems like most of the bikes that I've bought over the last, few years have required a 3 day adventure to go get so I was shocked to see this one close to home. This one has sat for two years as the owner had passed on but it's complete and has good compression and spark. Plus, it's been inside it's whole life. I'm hoping it won't take a whole lot to get it going. Anyway...I'm pumped and had to share it with people who appreciate it! My neighbors, who bitch about the sound of my straight pipe BSA, will LOVE this old two stroke firing off!!

    [​IMG]
    #1
  2. Scootern29

    Scootern29 Been here awhile

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    Nice bike. You need to post some pics up on Yamahaenduro.com if you can get on there. They are Yamaha fanatics.
    #2
  3. Gham

    Gham Long timer

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    Give us the good and bad after you've spent a little time with it!!!!
    #3
  4. Bugsy

    Bugsy Adventurer

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    I will for sure! It's been warm here so far this month so I'm going to try to get after it before winter really sets in. I need to pull the carb and clean it and also, the tank is pretty full of 2 year old gas. I also want to flush the oil system. I do know that the front forks need gone through as they are super spongy. Fresh fuel, oil, clean carb and plug and maybe she'll fire!
    #4
  5. Sniper X

    Sniper X De Oppresso Liber

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    There's a running lower mileage one for sale here locally I might buy if the timing works out. That and the 250 version are honestly the only early yamaha 2T Enduros I really felt comfortable riding on a daily basis. And they still are.
    #5
  6. FR700

    FR700 Heckler ™©®

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    Lord have mercy ... that is a beautiful time warp.

    You did well , congratulations.




    .
    #6
  7. Slaghammer

    Slaghammer Been here awhile

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    Love it !! Bought one new and loved it:clap

    One possible tip: Might want to do the initial, first time start up using pre mix in the tank until your sure the auto lube is working. Might cost a fouled plug in awhile but good insurance in case there is a problem.

    Great find !!
    #7
  8. Bugsy

    Bugsy Adventurer

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    I feel the same way about it and that's why I've been looking for one. I really want to ride it on a daily basis if I can. There's just something about these old DT's that I love!! I'm looking forward to getting into it!

    THANKS!!!!! It really is pretty decent. The thing that I like about it is that it's complete.

    I appreciate the advise and will take it!! The injection system on these does make me a bit nervous. I had an old 250 for a while and ended up just bypassing it and mixing in the tank.
    #8
  9. fastdadio

    fastdadio Still gettin faster

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    If your running a straight piped BSA, your neighbors will actually love you for this. They're not too loud. Do pull the baffle and check for carbon build up. If it's nasty, burn it off with a torch. I have had several oil injected 2-strokes. Never had any problems with the injection systems on any of them. They are very reliable and beat having to mix your fuel. I say +1 on adding a little oil to the main tank just to be sure. Especially in cold weather riding. I used to run 70:1 in my tank for winter ice riding while also raising the main jet needle one clip and going 1 size up on the pilot jet. They are known to some times run very lean on long WFO pulls. The old DT400's are in a suprisingly mild state of tune and are not the flaming beasts that many think they are. Good luck ad have fun.
    #9
  10. Bugsy

    Bugsy Adventurer

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    THANK YOU for the advise!! I appreciate it and will use it! I'm looking forward to getting this bike up and going. After hearing what you and others have said now about the injection system, I'm feeling better about it. I've just had the one, old 250 Yamaha that had this system on it and the whole bike was a real POS anyway. I like the idea of not having to mix in the tank all the time, so I hope that this one is operable. It's supposed to be pretty warm here next week so I'm hoping to get out to the shop and tear into it.
    #10
  11. fastdadio

    fastdadio Still gettin faster

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    If the bike is running, you can check the injection pump by putting pre-mix in your tank, pull the oil hose off the carb body or cylinder base and running the bike. use a shot glass and a stop watch and time the volume that comes out. The rate of flow should increase when rpm's are increased. The exact volume/time can be found in the service manuals.
    #11
  12. Bugsy

    Bugsy Adventurer

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    I've never thought of doing it that way but it totally makes sense!! I plan on doing some longer, type rides on this bike so I really want to be sure that it's working properly first!

    I'm hip to any advise and/or suggestions so I really appreciate it!
    #12
  13. ADK

    ADK dain bramaged

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    I second this, there seems to be quite a few members with this particular bike. :thumb
    #13
  14. fastdadio

    fastdadio Still gettin faster

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    +100K. Hats off to the guys over at Yamahaenduro. They were always very helpful to me when asking for help. My 77 DT 400 has been sold and was purchased by another Yamaha enduro enthusiest who is very active at their site.
    #14
  15. Bugsy

    Bugsy Adventurer

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    I'm going to register on there today. Thanks, fellas!!

    Jason
    #15
  16. Tourbus

    Tourbus Been here awhile

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    Don't known if the DT400 oil injection system is the same as a early DT1-250.

    On early 250's the oil control cable pulls the valve open. So a broken cable closes off oil supply. Bought one cheap with a seized engine from this happening. Prolly a good idea to check the cable once in a while.

    Butch
    #16
  17. Bugsy

    Bugsy Adventurer

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    Butch,
    I had one of those old 250's for a while in high school. That exact thing happened to this one but we caught it in time and just pre-mixed it from there. Good running little bike though! I'm going to go through this thing top to bottom before I start riding it much. I'd like to take it on some longer runs and ride it as much as I can throughout the year. It's survived all of these years and I don't want to be the one to fry it!!
    #17
  18. fastdadio

    fastdadio Still gettin faster

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    Cable break could happen anytime. Just remember to look back and do a 'smoke check' once in a while.:lol3 :rofl:lol3
    #18
  19. Vinnie the Snake

    Vinnie the Snake Long timer

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    Dont get anybetter than the old DT400, Think I am about 8000 miles of TAT, CDR and Shadow of the Rockies playing and them some here in OK. Still my favorite mountian/woods ride...

    Nice find.....:clap
    #19
  20. Bugsy

    Bugsy Adventurer

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    Welll...I finally got around to going through the DT. New battery, plug, clean carburetor, change lube and cleaned the gas tank and air filter. I also purged the oil tank and made sure the pump was pumping and aired the tires. 2 kicks and she fired off!! This is the first time in several years that it's ran and I was pretty stoked! It has good compression and spark so i figured she'd fire. I rolled out slow and did a brake and clutch check. It all seemed OK so I made a short trip around the block! It runs like new...so far). There's a lot more that I'm going to do before heading too far from home but so far, so good. The tach and speedo seem to function and I did lube them up as well.

    I'll post some pics when I get it out somewhere that's a bit more exciting than the alley!!!

    Thanks to all who gave me advice and info on these old dudes. "Vance..."Vinnie the Snake", thanks a million!! Maybe I'll see you on the TAT or just down in your neck of the woods before too long. a buddy of mine and I are discussing a little Vintage enduro roadtrip.
    #20