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street legal 2-strokes

  1. #1101

    Re: street legal 2-strokes


    REVELATION:

    I ran that bigger dome head for 2-3 years and I didn't even realize it

    ebay title: "1993 YZ250 cylinder head with good dome"



    ^^ this pic was from 2017 when I had the motor rebuilt

    I had no idea when I took that pic they were different

    so yeah...you guys are right.

    just send it

    but now I'm very curious if this head + woods port would have been a good combo.

    weird thing is I feel like the higher compression heads have a wee bit more low end

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    Last edited by breakdirt916; 09-18-21 at 11:00 AM.
    FREE $10 UBER CREDIT W' PROMO CODE --> PON41
    1994 Yamaha YZ250 CA Street Legal 2-smoke :smoke: ** 2017 KTM 690 Enduro R**

  2. #1102

    Re: street legal 2-strokes

    ahh, back to "normal"



    low compression head FTW

    smoother off the line - you can just gently roll on + let out the clutch with minimal to no feathering

    it made the bike behave 10% less "jerky"

    easier to just "cruise" 40-55mph on pavement to Cook's Corner; off the pipe



    (4.5 miles, 11 min ride)

    was a hot one today too...93-102 while I was out

    after 25ish mins of 55-65mph it fluttered around 175, and parked engine off like this:



    not a single overflow drop



    I like it!

    now follow me:
    -experiment with timing adjustments
    -11oz Flywheel weight
    -Keihin PWK36 or Smartcarb (currently a Mikuni 38mm flat side)

    is that the ultimate trail tune for a '94 YZ250 2-stroke without compromising longevity?

    I'm also tempted not to futz with it as-is

    I may just add the coolant reservoir for insurance, then move on to ergonomics and cosmetic

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    Last edited by breakdirt916; 09-22-21 at 06:33 PM.
    FREE $10 UBER CREDIT W' PROMO CODE --> PON41
    1994 Yamaha YZ250 CA Street Legal 2-smoke :smoke: ** 2017 KTM 690 Enduro R**

  3. #1103
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    I'm a big fan of coolant reservoirs, not much of a reason to not run them unless you're shaving grams off the bike for competition? On the carb front, I'm a lil torn, on one hand the Smartcarb did big things for my 92, that bike fires up hot, cold, no questions, no excess kicks, every time. On the flip side it replaced a W O R N out Mikuni VM36 so it didn't have a high bar to clear to be better. I have a 36mm SmartCarb new in the box that I bought for my 150 SX to replace the 'horrible' Mikuni on it and... I can't find fault with it. I'd say if the bike is behaving, I don't know as I'd suggest throwing that money at the bike for what may not be much of an upgrade?

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    Mistake - 1992 WR250ZD / 2000 LS650P / 2019 KTM 150SX / 2016 KTM 250XC / 2016 KTM 500XC W

  4. #1104

    Re: street legal 2-strokes

    yup, I do remember how clapped out the VM36 was for you...so the gradient likely equivalent to running a worn out tire to a new one. They always feel better.

    and maybe if it ain't broke, there ain't a real need to fix it...for $600

    maybe I'll consider a SC if I was planning to replace the Mikuni anyways

    priority re-arrangement:
    -post ride maintenance (air filter clean/oil, chain clean/adjust, fastener check)
    -coolant reservoir
    -hour meter
    -compression test
    -ignition timing adjustments (likely need to re-advance after I slowed it down before)
    -cosmetics
    -ergonomics (bar risers + tall seat)
    -mail out [woods ported cylinder + head] to EG for cylinder inspection/repair and/or hone + head work for squish band adjustment

    still *very* curious if the woods port just needed a big ole' dome for a head and been alright. Advance the ignition to make it wind up a little more quickly, then just add a flywheel weight. Boom. As good as I'd get.

    also - the good news is, I went 3 years on a cylinder, just did a hone, and now running the same cylinder again

    as long as the bike isn't overheating, not running a high compression cylinder, a new piston/rings + hone every 3 years isn't a lot of maintenance

    I just need to be extra careful for air filter cleanliness and I can probably safely go years

    tentative zip on Sunday evening

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    FREE $10 UBER CREDIT W' PROMO CODE --> PON41
    1994 Yamaha YZ250 CA Street Legal 2-smoke :smoke: ** 2017 KTM 690 Enduro R**

  5. #1105
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    Hah, in my case it was more like replacing a three time plugged, weather cracked, worn to the cords tire in the wrong size with a brand new knobby. I seriously think a windex bottle loaded with premix would work better than that old carb.

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    Mistake - 1992 WR250ZD / 2000 LS650P / 2019 KTM 150SX / 2016 KTM 250XC / 2016 KTM 500XC W

  6. #1106
    Lifer typeone's Avatar
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    Re: street legal 2-strokes

    good to hear she's runnin' smooth ! carb talk reminded me i have a TMX38 oval slide w/RM needle and Hall's tweaks if either of you is interested. comes with a spare rebuild kit and divider plate as well. it's just sitting on a shelf.

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    Beta 200RR

  7. #1107
    Backwoods lobster boy number9's Avatar
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    Re: street legal 2-strokes

    Quote Originally Posted by Kurlon View Post
    Hah, in my case it was more like replacing a three time plugged, weather cracked, worn to the cords tire in the wrong size with a brand new knobby. I seriously think a windex bottle loaded with premix would work better than that old carb.
    When it comes to dome, I'm a firm believer that more is better

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    '02 Ducati 998, '08 Ducati HyperMotard 1100S, '14 Subaru XV Crosstrek

  8. #1108
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    Quote Originally Posted by typeone View Post
    good to hear she's runnin' smooth ! carb talk reminded me i have a TMX38 oval slide w/RM needle and Hall's tweaks if either of you is interested. comes with a spare rebuild kit and divider plate as well. it's just sitting on a shelf.
    If I can ever find dyno time for the 92, I may take you up on that... Dyno time, a repairable stock bore cylinder... my quest for things never ends.

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    Mistake - 1992 WR250ZD / 2000 LS650P / 2019 KTM 150SX / 2016 KTM 250XC / 2016 KTM 500XC W

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