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  1. TresCuatros

    Lets see your front end swaps!

    Thanks! I did an absolute boat load of research looking at fork dia, offset, and spacing. There's not too many "wide" (195mm+)clamps with ample offset (55mm+) so I just keep searching and searching until I found a bike from the 80's that had em. My build thread has a lot of my notes and...
  2. TresCuatros

    Lets see your front end swaps!

    1973 Yamaha DT3 with BMW K75 Clamps and 41mm CB600 forks. Rotor is from GSXR, Caliper is CB600, Wheel is 19" DL1000 (V-strom) https://www.dotheton.com/index.php?attachments/pxl_20210221_235448999-jpg.231597/
  3. TresCuatros

    2x stroke street tracker - project coming together slowly.

    If you verified spark and you manually introduced fuel, the only thing left is compression. Given your order of events, I'm wondering if you have a stuck ring allowing too much compression loss.
  4. TresCuatros

    Yamaha DT3 - Small Garage, large ambition

    Saving info for rear swingarm random bits of info: https://flattrackersforsale.com/2017/06/30/ultimate-tt500-flat-track-racing-setup-guide/
  5. TresCuatros

    Yamaha DT3 - Small Garage, large ambition

    Intake update! After following the rabbit hole Teazer sent me down, the researched turned out quite fruitful! I bought an eBay intake for a Yamaha Blaster 200 in hopes the math and form factor would prove out before dumping $130 on a V-Force reed cage. This setup mostly checks out, with the...
  6. TresCuatros

    Best place for custom bearings?

    Yamaha did us dirty with their bearing selection, and yes they did use some 23mm ID's on their early, baby, steering stems. All balls racing has the best resources for bearing info including conversion bearings...
  7. TresCuatros

    1974 Yamaha RD200

    I like it! Did you make it buy that weld in bung for the cap? If buy, any info? Thanks!
  8. TresCuatros

    SR500 street tracker from boxes

    I'm looking at something like this for attaching to the frame:
  9. TresCuatros

    Zuma 2T Scootin' and Tunin'

    Exhaust is getting close to finish. Quickly adapted the original silencer I had and did a clearance check. Should be able to fire it up today!
  10. TresCuatros

    Yamaha DT3 - Small Garage, large ambition

    Oh yes - for sure watching that! The man has patients far beyond I could ever strive for. It's great watching someone document the full learning process.
  11. TresCuatros

    Yamaha DT3 - Small Garage, large ambition

    Thank you! I started another thread for more details on the pipe I built as a trial before this bike. I've been trying to hone my skills/calcs on this scooter before I destroy my DT. https://www.dotheton.com/index.php?threads/zuma-2t-scootin-and-tunin.77695/
  12. TresCuatros

    Yamaha DT3 - Small Garage, large ambition

    Big update! Lots of little spacers, adapters, and some clearancing all wrapped up. This gets the wheel and fork placed correctly with the stock frame. Here's what had to happen: 1.) Lower BMW K75 steering stem bearing diameter turned down to fit an adapter bearing from all-balls 2.) Upper BMW...
  13. TresCuatros

    Zuma 2T Scootin' and Tunin'

    What software have you tried and/or would you recommend?
  14. TresCuatros

    Zuma 2T Scootin' and Tunin'

    Pipe calcs (note; calculation does not equal execution. I lost some volume and length in fabrication. Target RPM may not match what I was hoping for...oops) Cylinder exhaust port exit / header entrace dia: 30mm; As built = match Header: 1.5 deg expansion, 42mm exit; As built = match Diffuser...
  15. TresCuatros

    Zuma 2T Scootin' and Tunin'

    I've learned some things as I tried this attempt with silicon bronze. 1.) Slip rollers can make partial cones - but it's a mutha f**ka to get a tight radius cone on 1 end and large on the other. (1" roller targeting 1.5" semi closure is about all I'd expect) 2.) Silicon bronze is not for butt...
  16. TresCuatros

    Zuma 2T Scootin' and Tunin'

    and here's the exhaust work (notes following)
  17. TresCuatros

    Zuma 2T Scootin' and Tunin'

    What we have here is a dirt cheap test bed for trying out two-stroke modifications and a great little toy for the track for sessions between the big bikes. I originally picked up this Zuma for $300 with faulty petcock and no registration. Fast forward a year or so and I've had a number of track...
  18. TresCuatros

    Sourcing Small Dia. Stainless Tube?

    After a few weeks of ordering this and that from various places, I'm finding that McMaster Carr ends up offering the best options with low lead time. Otherwise ebay has good deals. Anyway, thanks for the help.
  19. TresCuatros

    Sourcing Small Dia. Stainless Tube?

    The ID is pretty crucial but the OD I can fudge .100" or so. I'd like the ID to end up at .970 +/- .020. If it's under sized, I can get an expander. If oversized, I'll have a lip I'll need to address with the porting tools. It's for a small bore two-stroke exhaust, so it's highly sensitive to...
  20. TresCuatros

    Sourcing Small Dia. Stainless Tube?

    I'm building a new exhaust for a small displacement engine and having trouble finding decent prices on 25mm ID (~1") ID tubing. Most places will sell 1" or 1.250" OD tubing, and I'm left somewhere in between. Are you buying tube line-to-line or resizing somehow to fit the preferred diameters?
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