BETA 2-Stroke Thread. 250RR, 300RR, X-Trainer

Discussion in 'Thumpers' started by ToriMish, Feb 4, 2017.

  1. ChasM

    ChasM Been here awhile

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  2. NorskieRider

    NorskieRider Ultracrepidarian

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    If you do get the Fisch, you'll want the smaller one. I got the "Kit 25 (25.5mm-29.4mm)" ... IIRC I measured the stock outlet at about 29mm but I suspect it's not perfectly round and had to use a hammer to get it about halfway in and needed to be pried out with a screwdriver. I expect the next smaller size "Kit 20 (20.0mm-25.4mm)" would be much easier to remove and insert but will also restrict the exhaust even more.

    I didn't use it long enough for it to clog, and as I usually don't have any splooge I'm not sure there would be much in there to clog it. Either way, if it's easy to remove it's easy to put a torch to it and burn off the oil once in a while.
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  3. Bitingdog

    Bitingdog That's not my dog

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    You have a Keihin PWK carburetor. There's nothing easier to tune, and the 300 isn't really finicky anyhow. The book gets you pretty darned close. But as someone else suggested, set your float properly, 98% chance it's too high. Better to go 1-2 mm lower than specced for a woods bike, otherwise you'll be too blubbery off idle, stall when pointing steep downhill, and likely spilling more fuel than you burn
  4. Rob578

    Rob578 Long timer Supporter

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    I second the PWK, might want to try a NECJ or NECK needle. Some folks swear by the JD needles but I've never had any luck with them.
  5. Bitingdog

    Bitingdog That's not my dog

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    Love the linear throttle response of the NECJ Suzuki needle
  6. justBert

    justBert Been here awhile Supporter

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    It's beginning to look like this 2 stroke business is a lot more complicated than I knew.....lots to learn so keep it coming.
  7. Rob578

    Rob578 Long timer Supporter

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    Are you in the 2T business now?
  8. justBert

    justBert Been here awhile Supporter

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    I picked up a 2019 X-Trainer a couple of weeks ago and I am trying to get sorted out by Perry Mountain. I may do some riding at Brown Mountain this weekend since I'll be in the neighborhood. I'm thinking I need to put you and @shortman on my speed dial.
  9. shortman

    shortman Beta 500 RS, X-Trainer 250 Supporter

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    I'm around Bert so gimme a holler.... I'll gladly help anyway I can....
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  10. Rob578

    Rob578 Long timer Supporter

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    No problem!
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  11. CDN Rick

    CDN Rick Canoodia Eh?

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    I know you know this BD, but just a note since some here aren’t as familiar with smokers. That needle **may** work fine in many 300’s. Please do NOT suggest it for 250cc Beta bikes. It’s way too lean for them. I personally do not find it works well in my terrain or riding.

    Either way it is NOT a “one size fits all solution”

    Optimal carburetor settings vary based on altitude, temperature, and humidity, as well as rider style and preference. There is no right size fits all, unless the other rider is riding the same terrain as you on the same day, right beside you, on the identical bike.
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  12. Junglejeff1

    Junglejeff1 Long timer

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    Not really, don't fix what is not broken.Many of us on these forums are gear heads and like fine tuning our bikes.Only thing I have done to mine so far is put proper suspension springs on, sticky tires for my riding conditions and protection pieces because when I crash I do it right.Its riding season and bike works decent out of the box so I'm burning gas and hauling ass till snow fly,s.Ride it as much as possible before you go changing stuff so you can zero in on things you want better for the condition,s you ride.The X is a awesome bike out of the box if your riding knarly stuff.
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  13. Rob578

    Rob578 Long timer Supporter

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    I thought it went without saying that you need to match the main and pilot to the needle you're using especially if you switch to a completely different series. The PWK's aren't nearly as finicky as the Mikunis, there's no need to rejet just because the wind changes direction.
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  14. mtbdemon

    mtbdemon Long timer

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    I rode my first Beta's over the weekend 200, 250, 300 Race and Xtrainer. I thought I would like the 200 more, but I have to admit that both 300's I really liked. Now I want one, but which one? I'm leaning for the Xtrainer as I am old and slow, but dong that 300 race was so nice!!!
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  15. Bitingdog

    Bitingdog That's not my dog

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    Too right. Definitely not good on a 250 unless it's in the Colorado Rockies
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  16. Marley'sDad

    Marley'sDad Adventurer

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    I bought the 2021 300 RR and I can say without reservation that it is the perfect bike. I am in Colorado, and I ride single track, rocky high mountain passes, and easier stuff like dirt mesas around Pueblo. That bike does it all soooo well. I love it! You can't go wrong with the 300RR.
  17. Bitingdog

    Bitingdog That's not my dog

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    Trying to replace the starter on my friend's X-Trainer 300. Trying to do it without dropping the engine 20210912_215951.jpg
  18. St.AndrewsRider

    St.AndrewsRider Adventurer

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    Rehashing this thought after a few days and noting some of the other carburetor replies since then. So what are a few main jet sizes and needles to have on hand for the PWK carb JIC? Typically gonna be riding 2500-4500' elevation milder cooler temps going into fall. Been out of the loop for a while my current bike is EFI and my last carb bike was mikuni vm.

    BTW, got the call last week! My x-trainer is in! Gonna pick it up in a couple days when my sparky arrives and some other goodies.
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  19. Bitingdog

    Bitingdog That's not my dog

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    I'd ballpark it at 38 pilot, NECJ needle 3rd clip, 155 main jet. 1.5-2.0 turns out on the air screw, with float height verified
  20. St.AndrewsRider

    St.AndrewsRider Adventurer

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    Very good! I'll give that a shot. Gonna check the float when I get it home. Thanks
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