1968 Yamaha DT1 Treasure/Trash?

Discussion in '2 smokers' started by Valleyrider, Mar 8, 2010.

  1. Valleyrider

    Valleyrider I Survived The '60s

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    Yeah, it has the 30mm carb. When I started to notice the cylinder was different, I checked the carb. Just saw a partial GYT kit (cyl,head,piston & 4 rings) sell for $1025 on ebay last week. My cylinder is going out for plating soon.
    I still have a weak spot for the smell of castor bean oil, so... no autolube for this one. I have a half case of Blendzall in the garage from 1975, so I'll put it to good use!!
    Not sure this will be worth much when I get done, but it is bringing back a lot of old memories!!
    #41
  2. bk brkr baker

    bk brkr baker Long timer

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    Guilty:huh
    #42
  3. Valleyrider

    Valleyrider I Survived The '60s

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    No, not "Guilty"... "Vintage"!!!:lol3
    #43
  4. Motoduc1

    Motoduc1 backtrackvideo.com

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    Great feature on these old Yammies in the new issue of Moto Retro magazine.
    #44
  5. Valleyrider

    Valleyrider I Survived The '60s

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    After a little research, it seems that this is a 1968 motor going by the engine number. There was no number stamped on the steering head, but it has the post on the lower frame tube for the front tank mount.
    Spent a lot of the day scratching rust off of many small parts...
    #45
  6. Valleyrider

    Valleyrider I Survived The '60s

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    Well the "Donor" bike has given up the parts and will now serve as a mockup for the expansion chamber fabricator.
    Some of the progress... No need for base gasket, right??

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    Water had been in the bottomend for awhile!!

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    The empty cases, cylinder and head are placed back in the donor frame. Going to the pipe builder next month.
    This will make the pipe fit right

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    Forks are the next job... There was at least 2 ounces of water in each side!

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    Cleaned and waiting for new seals.

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    Once the new piston ring arrives Monday and I make sure that it "IS" the right one, the cylinder will be off to Wisconsin for chrome bore repair/replating.
    #46
  7. RodT

    RodT Been here awhile

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    Have you found new main seals? if so where I need a set for my 1971 DT-1E ,any help would be appreciated. Thanks Rod
    #47
  8. Valleyrider

    Valleyrider I Survived The '60s

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    Hey Rod, I called a bearing shop in Spokane and they have a seal that measures close to size I need. Don't have my notes handy, but it is a discontinued seal from Yamaha. NW Vintage Cycle parts has one for $46. The one in Spokane is $5.50. Same OD and ID, but 2mm thinner... I'm gonna give the cheapie a shot.
    Being in Calif., there should be lots of bearing supply businesses around, just call them with the seal (or bearing) number ie. SW-42-72-10 for a seal or 6204 for a bearing (not the right numbers, but they are on your seals and bearings).
    #48
  9. Donzzilla

    Donzzilla Been here awhile

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    Complete engine seals and gaskets are all over ebay for them things. Cheap too.
    #49
  10. Sniper X

    Sniper X De Oppresso Liber

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    Where did you find it online to watch?
    #50
  11. RodT

    RodT Been here awhile

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    I have been looking on E-bay and I can't find any main engine seals anywhere, some gaskets,but there not for a 1971 250. differant mag cover gasket. if you see some more ,Please E-mail me. Rod
    #51
  12. Donzzilla

    Donzzilla Been here awhile

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    Isn't a '68-'71 DT1 all the same? If it's a different mag cover then it would be a DT2.
    #52
  13. Donzzilla

    Donzzilla Been here awhile

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    #53
  14. RodT

    RodT Been here awhile

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    Thanks for the lead, I was on last night and couldn't find a thing. My mag cover gasket has 3 bolt holes, and the ones I've seen on e-bay only have 2 holes, and they say there are 2 differant ones for the DT-1's. Thanks again Rod
    #54
  15. eyedragaknee

    eyedragaknee McGuyver

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    Good to see I am not alone.

    I'm closer to being finished.:clap

    Website below has a bunch of before and progress pics

    Keep it going !
    #55
  16. dmottv

    dmottv Take the Long Way Home

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    Great to see this thread! The DT1 was my second bike and it introduced me to off-road riding. I met my wife's uncle about ten years ago, we got to swapping stories about bikes and some of mine were about that DT1. He takes me out to the garage, pulls a tarp off his old DT1, tells me to fire it up and take it for a ride. I didn't come back for almost an hour! The memories!
    #56
  17. Valleyrider

    Valleyrider I Survived The '60s

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    Some nice work...
    The weather has been bad and it's way too cold in the garage to make much progress.
    Hope it warms up soon!
    #57
  18. RunningBare

    RunningBare Been here awhile

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    I thought they went DT1 DT2 DT3 DT250A,B, etc.
    #58
  19. Valleyrider

    Valleyrider I Survived The '60s

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    The '68 had a 2 screw mag cover among other slight differences.
    The main crankcases were changed also at some point. The top main case screw that went right at the base of the cylinder was changed (shorter).
    The front fuel tank mount and top rear motor mount were two others.
    #59
  20. Valleyrider

    Valleyrider I Survived The '60s

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    Just about to head back to Idaho.
    Great to visit CalEfornia, but I need to go back HOME.
    The pipe came out really nice!! Found an Akront rim for the rear, found seat foam and re-production seat cover. Bought some used "Modern" dirttrack tires. Bought my old Ken Maely boots and steel shoe back and getting the itch to go racin!!
    Need my cylinder back first so I can build the motor.
    More driving for now...
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    #60