1976 DT250C Flat Tracker project.

Discussion in '2 smokers' started by Hunsta, Feb 25, 2012.

  1. JeffS77

    JeffS77 cheap bastard

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    wow I like what you guys are racing over there..more of a run what ya brung kind of deal..out here it is pretty much framers and purpose built trackers all running Maxxis and Goodyear DT tires.. I modded my '79 KLX 250 a bit and did a few races last season and actually beat a few guys on " real" flat trackers in the main


    just threw on some shinko trail bike tires and a reverse cone on the exhaust..its a blast to beat the real bikes with it

    [​IMG]


    KEEP UP THE GOOD WORK :clap
    #21
  2. dirt_bloke

    dirt_bloke Triumph Tiger. Because Resistance is Useless.

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    Good one Jeff! K.I.S.S principle.

    BTW, what is the tasty little yellow and white Yammie hiding in the shed there?

    Noice powder coating Craig, how's the project coming along?

    I'm still at work, the cyclone in the gulf has made it a wet week! The weather radar at home doesn't look too good for you getting out again!

    Pete
    #22
  3. Hunsta

    Hunsta Have guns will hunt

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    Thanks mate. Things coming along nicely. Went to the Maleny swap meet today. Got me a nice tank. Its off a `76 DT100, but its fairly good on the inside and the shape is very similar to the 250 tank. I just have to move the securing pin 20mm forward on the frame to make it fit. I`ll paint it up and put a 250 sticker kit on it. And as my father was often to say "A man on a galloping horse, wouldnt stop to look at it".
    #23
  4. TheTrav

    TheTrav n00b

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    NEAT! I have a 76 DT250 myself. I'm curious to see how that sister model MX250 pipe you have works out. I have a pipe from a 73-74 MX250 which looks alot like the stocker but lighter and more of a chamber.. however never got it fitted. I also hav a hand-made pipe that two of us on Yamahaenduro had made, but it totally killed the low end, and I have never been able to make it work really good up top, but it wants to rev to the moon.. The consensus was those guys didn't know what they were doing.

    I'm anxious to see this develop and see how it runs for you! What carb are you planning on using?
    #24
  5. Hunsta

    Hunsta Have guns will hunt

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    To tell you the truth I`ll be interested to see how it goes myself. The silencer at the end as I said was made for the exhaust, but never used. As a flat tracker, I will be using mostly mid to mid-high range so if there is any low end loss, it wont effect it too much. The biggest thing Im concerned about is the fact that its held together just after ther start of the pipe by springs. I`m not all that clued up on the way 2 stroke exhaust of this type work as the original had no joints and wonder about losing exhaust pressure through the joint.
    Im using the stock carb it came with. Just putting a kit through it with a foam pod on the end. Ive also had a single cable made up for it as Im not using the oil pump. Im limited in what kind of carb I can use in the category Ill be in (pre `78), so there may be a bit of R+D along the way.
    As for the rest of the bike I should have a more updated pic soon. Been trying to get a complete rolling chassis going and am being held up by of all things tyres. Ive been informed yesterday, that I`ll have them by Monday.
    Til then..............
    #25
  6. Hunsta

    Hunsta Have guns will hunt

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    OK its been a little while since I gave you an updated pic of the bikes progress. Since getting the bike back from being powder-coated, I set about putting it back together. I wanted to basically have a finished rolling chassis before I started on the motor. I didnt want a new motor sitting round while I did the frame.
    I had a hard time finding a 1976 DT250 tank. There was a few in the US, but they all looked a little cruddy, and the inside, no matter how they were described were really an unknown quantity. Also the postage was at times more than the tank itself. Luckily my favourite swap meet was coming up and there sitting on a bench was a nice 1976 DT100 tank. It was nearly the same shape with little damage and the inside looked in good nick. For $70 down from $150, I thought I got a good deal.
    So I sanded the tank back to bare metal, then primed and painted it. A DT250 decal kit was on its way from the US and with a very shaky hand (I was nervous I was going to stuff it up) I applied said decals with as little bubbles as possible. A quick prick with a pin soon fixed any bubbles and then a few coats of clear over the tank again and she was good to go. All Im waiting on now is the petcock for it.
    The seat was next. Basicly it was a simple case of recovering it in vynal and it didnt come out too bad for a first time.
    The forks were given a once over on a buff to bring them back to a bit of a shine and new fork seals, dust covers, new oil and fork gators were next on the list. Then it was onto the wheels. The spokes and hubs werent in too bad condition, however I did give them a going over with a wire wheel and a touch of paint (I know. Tacky but it worked) they were good to go.
    Today I finally got my new tyres. I have to run a trials type tyre on the rear and any type of knobbie on the front.
    So there you have it. The motor is next. I have new crank bearings. Big and small end bearings. New crank and cugeon pin. And a full seal kit. I havent bought the piston kit yet as I will have it looked at to see what size over-sized set I need.
    So the next time I have an update to post it should be a finished product.
    Til then...............
    cheers
    Craig
    [​IMG]
    #26
  7. vudu

    vudu Been here awhile

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    Having one of these myself I'm enjoying your progress. Schweet! Which sort of trails rear did you end up using?
    #27
  8. Hunsta

    Hunsta Have guns will hunt

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    I went with a Pirelli. $149.00 The front is a Vee Rubber. Bit El-cheapo, but will do for now.
    #28
  9. Valleyrider

    Valleyrider I Survived The '60s

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    Really looking good!!!
    Keep the pictures coming
    #29
  10. anonny

    anonny What could go wrong?

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    Looking good.:lurk
    #30
  11. Sleepy John

    Sleepy John Grumpy Adventurer

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    So, should be finished this long weekend?

    SJ
    #31
  12. JeffS77

    JeffS77 cheap bastard

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    So whats the word on the bike ??
    #32
  13. dirt_bloke

    dirt_bloke Triumph Tiger. Because Resistance is Useless.

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    Craig,
    We're racing on Sunday (15/7), is the bike ready yet?
    #33
  14. Hunsta

    Hunsta Have guns will hunt

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    Alas if only. I have been dragging the chain a bit. However I only just yesterday got the completed bottom end back so the motor should be back together by end of weekend. Will post a pic soon.
    #34
  15. tHEtREV

    tHEtREV Captain Awesome... tEAM iDIOT.

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    I'll be making another trip to Townsville in about 4 weeks (I hope) so if you want I will have a look for any usable spares I have there.

    And I found the compliance plate in the shed, it snuck down here in a box of Kato parts, I'll get that to you too.
    #35
  16. Hunsta

    Hunsta Have guns will hunt

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    The completed motor. New crank bearings. Big and small ends. Conrod. Piston and rings. As well as all new seals.


    Mmmm aint she puuuuurdy

    [​IMG]

    I can see the light at the end of the tunnel now.
    #36
  17. JeffS77

    JeffS77 cheap bastard

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    Looking good:freaky
    #37
  18. Valleyrider

    Valleyrider I Survived The '60s

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    Too Puuurdy to get Dirty!!! :lol3
    #38
  19. Sleepy John

    Sleepy John Grumpy Adventurer

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    You've done a great job, mate.
    #39
  20. Hunsta

    Hunsta Have guns will hunt

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    Well after 6 and a half months and $1400.00 my 1976 DT250C Flat Tracker is basically finished. I say basically as at the last minute I found that the retaining nut for the primary front cog was nearly stripped and Im awaiting its arrival before I can test ride the bike. However its is a goer as you will see. Ive had fun building the bike. The best thing was tracking down the parts I needed.
    As for the parts,(Ive already mentioned this) the motor has new crank bearings, conrod, big and small end bearings, piston and rings. As well as a full seal kit. The barrel is on its 4th oversize so if I need to go any bigger I will need to source a newer barrel. Theres also new swing arm bushes, YSS shocks, fork seals, dust seals, and a host of other bits and pieces.
    As for the body. I recovered the seat myself and the tank is a 1976 DT100 tank as I could find a decent tank here in Australia and all the tanks in the US or UK were out of the question due to the postal costs.
    Well there you have it.
    And here it is.
    [​IMG]
    #40