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street legal 2-strokes

  1. #1126
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    https://www.youtube.com/watch?v=mmoMeX8bRTk

    Check out the bikes they're fielding.

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  2. #1127

    Re: street legal 2-strokes

    DUDE

    THIS IS AWESOME! LOLOL

    “That bike is surprisingly good.”

    And I know exactly how the bike feels when the rear bounces all over the places and “it has no low end you gotta rev it to idle.”

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  3. #1128
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    The 'rev it to idle' is the result of a worn clutch pushrod assembly. The rod, ball bearing and tophat eat each other over time, and eat into the pushrod. The fix I found was to reshim the assembly with valve shims in the top hat. Was pleased to see both bikes make it to the end.

    Also, becoming more and more of an AJ fan, just a good guy all around, looking forward to doing another school of his if the opportunity arises.

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  4. #1129

    Re: street legal 2-strokes

    where the clutch cable attaches is also a discontinued item

    I bought an extra used one from ebay just in case

    was also pleased to see both bikes finish...and AJ was indeed a good dude!

    that RMATV video was a 4 part series...check out the first few

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  5. #1130
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    Literally just finished the first three. Can you imagine if we had known and both showed up with our machines at the beginning.

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  6. #1131
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    street legal 2-strokes-yz250-logic-png

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  7. #1132

    Re: street legal 2-strokes

    people are particularly more impatient this holiday season

    690 is still in the shop, so I took the YZ to sneak away a couple hours to get my sanity back

    of course the closest OHV area is closed from the recent rains



    oh well; I just rode the fire road next to it



    but man...every first ride makes it feel sooooooo fast

    and the weirdest thing - the stutter at WOT/higher RPM's wasn't there

    I didn't change a thing. The bike's been sitting for a month covered in dust...it started 4th/5th kick and it rips.

    Maybe because it's a little cooler and I was riding it close to sea level?

    i dunno

    snuck in a little bit of this



    amped me up to plan the next day to ride

    now if I could only get days off...been working 8 or 10 days straight...and now people are testing positive for covid, and I'm being picked up for a corporate project. yay.

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    Last edited by breakdirt916; 12-22-21 at 01:05 PM.
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  8. #1133

    Re: street legal 2-strokes

    ahh the Cajon pass



    the gateway to the high desert

    being along the freeway reminds me of riding at Franklin along the highway



    rode the trails and hills near the freeweay



    and it just rained, so epic chocolate cake conditions



    you could be WOT just sliding through these mushy conditions





    bike ran great! It was loving 48-55 degrees out...coolant temps were under 150.

    it's just such a fun light trail bike after riding the 690...I definitely want to transition it to full time small bike duty

    it still has that studder/miss...definitely gonna try some main jet changes

    my only major issue is SoCal traffic. It took me 2 hours to get to the staging area, and I only rode 2-3 hours...then 1hr6min drive home. If it was only an hour drive; yeah it's a good fix. But a 2 hour drive was a little tedious for a short small bike ride.

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    Last edited by breakdirt916; 12-27-21 at 02:20 AM.
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  9. #1134

    Re: street legal 2-strokes



    first ride in almost 3 weeks for the YZ

    she fired up in 4-5 kicks

    took her where I took the 690 last time

    the YZ is obviously way more fun in the tighter stuff!

    we found some flowy single track stuff in the hills

    the spot wasn't bad; staging area/CVS parking lot was only 27 mins from home, but you have to ride 5 miles of pavement to hit the dirt. I kinda like that because it keeps a lot of quads/dirt bikers out of the area since they don't have a place to park. Rolling hills with single track cut into it...you have to connect some of it with some fire roads, but it's not too much fire road.

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    Last edited by breakdirt916; 01-22-22 at 01:14 PM.
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  10. #1135

    Re: street legal 2-strokes

    short sections, but flowy















    22 miles, done in under 90 mins

    time-lapse mode: 1 pic every 5 seconds.

    May even try 1 pic every 30 seconds & turn off the LCD.

    2 batteries should run a full day of set-it-and-forget-it

    I also splurged and got the flywheel weight!!

    I am about ready to pull the cylinder head off and do an inspection, so I may add the FWW at that time.

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    Last edited by breakdirt916; 02-04-22 at 05:41 PM.
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  11. #1136
    Lifer typeone's Avatar
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    Re: street legal 2-strokes

    man, that looks dreamy

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    Beta 200RR

  12. #1137

    Re: street legal 2-strokes

    I try to tear down & inspect when I can:



    cooling system is doing great...almost full

    head still looks clean AsF



    I never want to run a higher compression head ever



    no detonation/hot spots...no snags on cylinder stripes:



    I am suspicious of this power valve stopper



    ordering a new one now for insurance

    EDIT: they're $100 each brand new!

    I also tried packing my tools and test fitting the tail pack:



    umm...no...



    even if I move the plate and tail light back, that's not a good idea

    it's attaching to just fender plastic. No subframe. It's heavy and may rip off the whole fender in the whoops.

    rotating it *may* help, but I dunno...



    I'd also need to fab special brackets to line up holes.

    otherwise, about 4 spokes were loose on the rear wheel

    filter just spray cleaned & rinsed w' water and looked pretty good



    oiled her up and good to go

    put on the flywheel weight.

    on pavement, it feels about the same.

    can't wait to try it on the trails!

    but if it doesn't make a noticeable improvement, I may take it off...one less thing to wiggle loose and fail.

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    Last edited by breakdirt916; 02-10-22 at 01:10 PM.
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  13. #1138

    Re: street legal 2-strokes

    tested out the flywheel weight today:



    honestly, it's kinda meh

    the rpm's hang a little more than usual, and maybe you can lug it 5% more than usual before it stalls, but it's not too different than without it.



    It was a wee bit more steady in the ST; but the most benefit simply comes from your own rider skills in balancing and managing the throttle

    got to see some snow up there too:





    ocean views



    And I witnessed a helicopter landing:



    not gonna lie, it was pretty bad ass!

    he was meeting his son up there

    gonna tighten down the flywheel weight, do another run in some hills or desert, then decide if I want to keep it on

    getting the ported cylinder repaired w' a cylinder head milled out for pump gas is where I'm thinking I want to try next in the motor.

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  14. #1139
    Lifer typeone's Avatar
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    Re: street legal 2-strokes

    interesting about FWW, maybe give it some time. they really only shine in the slower tech sections when a little more momentum in the motor will keep it alive. i found that nice in the woods when adding to an MX bike.

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  15. #1140
    Lifer Kurlon's Avatar
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    Re: street legal 2-strokes

    Bear in mind that gen YZ doesn't have a small flywheel to begin with, so adding a weight isn't the massive change you get compared to some starting with tiny flywheels.

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  16. #1141
    Backwoods lobster boy number9's Avatar
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    Re: street legal 2-strokes

    Quote Originally Posted by breakdirt916 View Post
    tested out the flywheel weight today:



    honestly, it's kinda meh

    the rpm's hang a little more than usual, and maybe you can lug it 5% more than usual before it stalls, but it's not too different than without it.



    It was a wee bit more steady in the ST; but the most benefit simply comes from your own rider skills in balancing and managing the throttle

    got to see some snow up there too:





    ocean views



    And I witnessed a helicopter landing:

    That's an MD500 NOTAR ("NO TAil ROtor"). Instead of a traditional tail rotor, it routes exhaust from the turbine to provide anti-torque thrust. They're very cool.

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

  17. #1142
    Lifer typeone's Avatar
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    Re: street legal 2-strokes

    Quote Originally Posted by Kurlon View Post
    Bear in mind that gen YZ doesn't have a small flywheel to begin with, so adding a weight isn't the massive change you get compared to some starting with tiny flywheels.
    ah, got it, that makes sense then.

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    Beta 200RR

  18. #1143

    Re: street legal 2-strokes

    I may have dropped things too early in the past

    I will definitely keep it a little longer to give it a chance...I didn't know it was already heavy, credit to Kurlon!

    if you can stand staring at my handlebars for 30 seconds, this is how it did:



    my palms get sweaty just watching it...sketchy narrow sections

    but honestly this 1st gear ish kinda looks like the ideal spot to use a FWW...maybe I should keep it

    Quote Originally Posted by number9 View Post
    That's an MD500 NOTAR ("NO TAil ROtor"). Instead of a traditional tail rotor, it routes exhaust from the turbine to provide anti-torque thrust. They're very cool.
    VERY COOL! much thanks

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  19. #1144

    Re: street legal 2-strokes



    tried some more seat time on the FWW

    it definitely makes the engine speed a little more stable

    found some "new to me" ST sections in the local ride





    they're only 30-60 seconds of riding, but something to add onto the usual ride...not too technical

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  20. #1145

    Re: street legal 2-strokes

    flywheel weight cover spacer has uneven "squishiness" which doesn't allow for even pressure from the case screws...and despite tightening it came loose.after 3 rides



    bolt got stuck on the shifter

    spacer slid down and dragged/jammed the flywheel so engine wouldn't turn over (felt like it was seized)

    I had the tools to loosen everything, line up the spacer, and get going, but mannnnn....stock yamaha is best! when you add mods, it's just another thing that can break.

    after that was sorted, I did the loop...seeing some yellow:





    looping some of the ST together, it's a 25-30 min loop



    honestly, that's an excellent mid week rip...I wish it was closer than 35 mins away!

    FWW is coming off, ported cylinder going to EG w' head to mill for pump gas. May try a lectron or PWK38 AS next.

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    Last edited by breakdirt916; 03-09-22 at 09:26 PM.
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  21. #1146
    ^ It's my bike and my car tls25rs's Avatar
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    Re: street legal 2-strokes

    Quote Originally Posted by breakdirt916 View Post
    honestly, that's an excellent mid week rip...I wish it was closer than 35 mins away!
    I wish I had any "legal" riding within 35 miles of me that was worth riding on. Closest thing to where I live is the Rockingham Rail Trail which while it is nice to have a trail that is open year round the fact that it is flat, relatively straight and has a very low speed limit that is enforced makes it not so appealing to ride there. Other than that to be legal I have roughly an hour ride.

    There are some not legal areas that are somewhat tolerated but if the F&G or DHR show up it can get expensive quickly

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  22. #1147

    Re: street legal 2-strokes

    woes of the dirtbike riders in 2022...unfortunately this doesn't get any easier

    blows my mind that riding a dirt bike in a hilly area that with nobody else around you and they'll send a helicopter, 2 police cruisers, and a tow truck.

    I'm looking for a plot of no-mans-land within 15-20 mins away that nobody else wants; something hilly with no water, power, or even anything paved LOL. If it's a cheap enough cash buy, I'd hit it. Ride out (no freeway), do some laps, come home. In the mean time 30-120 min drives will have to do...1st world problems

    meanwhile, thank you auto-search on eBay!



    here's my next mod...

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  23. #1148

    Re: street legal 2-strokes

    daylight savings mean after 7pm sunsets



    the new-to-me spot is ~35 min drive from work on toll roads.

    if I'm loaded as I get off work, I can KSU 6-ish and get in a 1 hour ride on the single track-ish loop.

    some people on groups are bugging me to check out another spot 1 hour away near Lake Elsinore.

    Hoping to check out 2-3 more epic spots before the summer heat turns on!

    low beam doesn't work...guessing the baja designs resistor burned out...gonna order a new harness & just run high beam for now

    clutch slack was high too...adding it to the routine checks.

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    Last edited by breakdirt916; 03-22-22 at 03:38 PM.
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  24. #1149

    Re: street legal 2-strokes

    another post work 1hr quickie loop





    there was a critical uphill moment that FWW ROCKED! I was gonna stall and the RPM's just kinda "hanged" so it stayed running! I kinda wanna keep it now...I'm wondering if I can run the cover without the spacer

    I also finally need to replace my rear tire. I can usually slide the rear out on fire roads no prob; but this time I couldn't save it and had a gentle dirt nap. Going to an 18" + nitromoussse

    I also got the FMF Gnarly - it's in pretty good shape for its age! not all rusted out

    next steps:
    -18" rear wheel, new tire, nitro mousse
    -FMF Gnarly + jetting
    -PWK38 AS
    -mail ported cylinder + head (for cutting) to EG

    ^ ultimate trail combo!!!

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    Last edited by breakdirt916; 03-28-22 at 10:33 AM.
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  25. #1150

    Re: street legal 2-strokes

    fun fact: an 18" rim doesn't necessarily mean the (rim+tire) is any shorter than a 19" setup



    18" is on the right

    just threw on a cheapo DOT Kenda trackmaster. For "C" ride duty, cheap = best.

    Wiggles funny on pavement, but hooks up *enough* on dirt

    the 19" and 18" even have the same 49 tooth sprocket = straightforward wheel changes

    1st ride w' out the flywheel weight:



    Definitely stalled accidentally a couple times, but the trade off for a quicker revving motor (and stator cover properly secured) is worth it.

    ST is a little overgrown



    found a little bit of new stuff too, and honestly adding a couple more ST sections makes the loop *just* entertaining enough for a 2-ish hour ride



    after doing 2 days of canyons w' Iglu, getting back on dirt with the YZ felt like being on a rocket ship

    dirt is so fun

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    Last edited by breakdirt916; 04-25-22 at 09:10 PM.
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