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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

  9. #1109

    Re: street legal 2-strokes

    did a quickie after work Sunday



    rode w' out earplugs, and man is the engine noisy



    at certain RPM's it just vibrates

    but finally getting some cooler temps

    she definitely runs a little smoother when it's cooler

    55-65mph cruising was no prob w' the 13/49 gearing too...*just* enough for me to ride from home to the local spot (17 miles/30 mins of pavement)

    hoping to get a ride in every 1-2 weeks again

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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**

  10. #1110

    Re: street legal 2-strokes

    did a 1 hour ride after work to get sanity back after work



    man that Baja designs low/high beam works very well in the dark ass canyons

    definitely next step: sit down and inspect the bike's fasteners. It's possibly vibrating something loose a little more than usual.

    getting a little dark too early for after work rides though....ugh...I liked midweek dirt rides...maybe track under the lights?

    power valve is definitely working - bike picks up!

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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**

  11. #1111

    Re: street legal 2-strokes

    Breakdork916: I need to do more maintenance and put on an hour meter before riding again.

    Also Breakdork916: 100 mile desert ride



    Was itching to ride this weekend so badly that I had the bike loaded with gear on Thursday a Buddy offered to join, so we did our usual loop. 100 miles of open desert trails, mostly hard pack, some rocky hill ridges, a long sand wash, whoops, ruts, and some desert roads

    Bike: pro’s: started and ran great! Highest coolant temp on the radiator cap was only 175ish. At one point (5th gear/40ish mph) it even dropped to 140 high today during the ride was 89 and it was fine.

    Cons: it “skips” a fire when on the pipe WOT and blasting through the gears when it’s wide open. It almost feels like a minuscule “miss”. Jetting and plug match what I ran before, but my timing was retarded and not corrected. I will start with the proper timing as a baseline, then go to spark plug and jetting if necessary. Once it’s all good, add a flywheel weight.

    Engine is still a little noisy for vibration at a certain RPM. Whatevs I think I had this before. Send it.

    Riding position is still a little cramped while standing - bar risers should help.

    Battery may have gotten disconnected when I cleaned the air filter.

    one or the seat bolts backed out the last 2 rides. Threads in the subframe may be stripped, or I may need to put some loc Tite on it

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    Last edited by breakdirt916; 10-03-21 at 05:49 PM.

  12. #1112
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    Skipping, or detonating? Pull the plug, take a peek with a boreoscope and make sure things are happy in there.

    On the seat, drill out the frame, helicoil. Had to do both sides on mine.

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    Last edited by Kurlon; 10-03-21 at 05:52 PM.
    Mistake - 1992 WR250ZD / 2000 LS650P / 2019 KTM 150SX / 2016 KTM 250XC / 2016 KTM 500XC W

  13. #1113

    Re: street legal 2-strokes

    Damn, I don’t have anything heli coiled, so I guess it is time



    Forests are cooling down...reminds me of fall on the east coast

    Man is that bike fun in the crisp cooler weather

    Prob gonna do a night ride Sunday after work then use Tuesday as a full day off for wrenching and inspection and ignition advancement

    edit: taillight LED is bouncing around in the assembly

    I may try to glue it, but it may be time for a new taillight

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    Last edited by breakdirt916; 10-10-21 at 12:24 PM.

  14. #1114

    Re: street legal 2-strokes

    passed out Sunday after work

    but another forest road re-opened after 3 years, so I thought I'd check it out today instead



    views were ok, but meh...it wasn't worth driving 55 miles for 11 miles of dirt road. There's another forestry entrance 17 miles from me.

    it was, however, kind of neat to see the peak (where those radio towers are) from the other side



    ^^usually I'm looking down from up there^^

    some small sections of the road had the east-coast feel to it



    the last 5 miles were 40ish mph pavement



    ^^ not bad

    tentative scout ride this Saturday at Ocotillo Wells

    planning a 40-50ish mile loop around a State Vehicular Recreation Area w' points of interest

    front left turn signal stalk broke

    I can't have ANY dual sport bits near any moving parts or it eventually breaks. The plate can't be under the fender, no turn signals near the front brake line, no speedo stuff on the forks, etc.

    Edit: I need to order:
    -2nd air filter
    -extra OEM O ring head gaskets before checking the top end again
    -new front turn signals
    -flywheel weight

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    Last edited by breakdirt916; 10-14-21 at 01:45 PM.

  15. #1115

    Re: street legal 2-strokes

    Saturday Ocotillo Wellllllssssssss



    3 hours of driving

    it's a fairly large sized SVRA, but all the "main roads" or sand washes with groups of SxS and kids on dirt bikes whizzing at you

    the fun stuff for dirt bikes are in the hills...



    I just wished I knew where all the "good hills" were so I could link them together

    main roads link you to points of interest




    ^^ the "pumpkin patch"

    ridge riding through the hills on a small bike is rad





    it was 90-93 and dry, and riding solo (with a satellite SOS) I still felt stressed out

    up on a hill, the bike didn't start...so I bump started to get going

    and on the long sand washes, I was worried the bike was "losing power" and the coolant temps were creeping into the 190-200 range

    bike made it back to camp, and it could be that:
    -long sand washes are hard on bikes
    -being WOT in 5th and on/off the pipe will creep up coolant temps
    -90-93 is somewhat of the upper limit to sand riding...it's going to run the bike pretty hot

    I'm going to do a coolant drain/fill, top end inspection, and plug check tomorrow to be sure

    but man that stress was not a good feeling. Super hot days may just be best in elevation within the forests (cooler up there), shorter rides, or coastal street bike rides on the 690

    not sure I'd go back to Ocotillo anytime for dual sport riding when there's great high desert riding 2 hours from me. SVRA's are great when you have a group with mostly OHV's/SxS's, and camping out

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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**

  16. #1116
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    Your bike has a radiator cap that keeps the pressure above 14psi, 200 deg isn't boil over, so I wouldn't be overly concerned about the temps you hit.

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

  17. #1117
    Lifer backinthesaddle's Avatar
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    Re: street legal 2-strokes

    Friend of mine just did a fully street legal KTM300XCW-TPI or whatever the whole nomenclature is for that oil injected/fuel injected 2 stroke. Got a set of Warp 9 and Q3+ for track days and pavement fun, along with a larger front rotor and smaller from sprocket. Then goes back to the dirt set up for, the dirt or street/trail. Guessing his next step is dual sport tires.

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    2013 ZX6R-636

  18. #1118

    Re: street legal 2-strokes

    300 TPI is a perfect 10! Best dirt bike ever!

    Wish I could CA plate that...alas not in my lifetime.

    Good news @Kurlon - you are correct! 200 was not boiling temps:



    (Full capacity 1.2L)

    Piston had some carbon build up:



    Did not look like any hot spots though...so detonation issue is solved

    Cylinder head came out with a oil film, but it wiped right off.



    Cylinder also looked generally ok:



    Vertical lines are smooth to the touch. No snagging. Cross hatching still present.

    This is good news! Everything looks generally good!

    I still need to advance the timing but forgot my impact driver and flywheel holder tool at my other storage unit. D’Oh!

    I also couldn’t button everything up anyways since the inner O-ring deforms during every tear down.



    Might as well order spare inner and outer rings for insurance.

    Alright then. No riding this weekend...next ride sometime next week.

    Might as well clean the carb, new plug, new air filter, radiator Louvers to hold a coolant reservoir, clean the chain, and hand clean the bike.

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    Last edited by breakdirt916; 10-20-21 at 06:32 PM.

  19. #1119
    Lifer typeone's Avatar
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    Re: street legal 2-strokes

    i don't like to reuse o-rings but if they're recently fresh, sometimes a little grease will hold them in place while you reassemble.

    spares are always good to have.

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    Beta 200RR

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