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Thread: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series ONLY)

  1. #181

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    Quote Originally Posted by gmoss View Post
    The 150 likes a high mark. I think you will find it works well where it is.
    Wish I had read that before I just went out to the garage! played around etc and found like many others I can now turn the adjuster with the 4Oclock bolt tight! TBH I was quite happy with the way it rode but thought would be good to have a look to see if it could be improved (wish I hadn't bother touching)

    so any old oring, cut it and stuff it in basicly and hop its ok! At least I counted how many turns in to fully seated so can return to where it was once I sort the 4oclock bolt!

    Thanks very much for everyones help I really appreciate it!

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  3. #182

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    Hey guys. I have a question that I couldn't find an answer to in this thread. I just bought a 2013 150sx. I was out in the woods and it was impossible to ride. Zero bottom then hit like a freight train. Total light switch power. So I started thinking my PV was stuck open. i did my research and pulled the pipe and opened both windows on either side of the cylinder. I could see that on the clutch side of the motor my fork and ball are not connected. I was told that you can get them connected if you play around with the adjuster knob. I couldn't. Do I truely have to pull the cylinder to realign them or is there a trick to getting them back together?

    Thanks for the help.

  4. #183

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    I read this post. Decided to check out my settings. Previous owner had it set really low. Adjusted it
    a little lower then the langston setting. Man what a world of difference. It doest hit the PV until later in the revs. Comes on quick and hits pretty hard. But it makes the slow technical stuff way easier to manage.
    Attached Thumbnails Attached Thumbnails IMG_1062.jpg   IMG_1068.jpg  

  5. #184

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    Hi could anyone help me with this. The bolt that locks the threaded adjuster doesn't seem to work. With the bolt tightened up, the adjuster can still be turned by hand. I took out the bolt. It's not long. What else goes in there to secure the adjuster. Thanks - pic attached
    Attached Thumbnails Attached Thumbnails Screen Shot 2019-06-27 at 4.04.28 pm.png  

  6. #185
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    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    arjay125- that bolt needs the 'piece of o-ring' that's been mentioned above. Any piece of o-ring will work as long as it's a smaller diameter than the bolt hole, obviously. It doesn't take much length, and a word of caution: too long of an o-ring chunk can crack the clutch cover. I put in a piece, maybe a 1/4" long, and snugged the bolt. As I got it to snug the case cracked from the bolt boss down to the PV adjuster hole. My advice: use a shorter piece of o-ring than needed and go longer until your PV adjuster is held in place. Kyle

  7. #186

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    After seemingly tackling a new Keihin and getting that dialed in, I thought Id take a look at my PV. As I suspected, it was set very high, made for an electric power delivery in the woods, but since I had everything open, I adjusted it down towards the supertrunk setting. Excited to test ride it and tune to what I like.

  8. #187

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    Holy buckets. Dramatic change in power delivery. Think I may have went too far! Lol going on a little Trail ride Sunday, might be dialing it back (or embracing it). Went from geriatric to ADHD

  9. #188

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    The higher the mark, the later the “two stroke hit” occurs. Some people like the later hit, some don’t. I like the PV to open sooner, and have the hit come in at about ½ to 5/8 throttle. The late hit feels “flat” or “lean” to me, but that might be just the feel you like. Generally, higher is milder, lower has more punch.

    Clear as mud yet?[/QUOTE]

    Hello! New to this power valve adjustment option and have seen a couple of videos and post. Seems there are some conflicting wording when it comes to higher and lower and sooner vs later I just want clear understanding of the marks and associated correctly. So my question is, if the mark is higher is that where the power hits quick and lower the hit is later and perhaps mellowed a bit? Thanks.

  10. #189

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    you have it backwards.

  11. #190

    Default Re: Adjusting the Power Valve on the 125 / 200s (For the 125 / 144 /150 / 200 Series

    With the mark set high you will pretty much not have a hit and it will make the bike a great lugger but mind you this will take away pretty much all your top end. I tried the Langstone setting when I got the bike because the power hit was too strong but I quickly realized that too much power was lost overall and reversed to pretty much a Supertrunk setting.

    I am now plying more with Jetting and can't stop to wonder if it could be possible with a combination of both to improve the power response. For instance lower the powervalve to have a really strong top end and mitigate the hit with a different needle ? Like a rich pilot to get good bottom, "lean" needle to tae down the power hit and rich power jet to have the potential up to ? Anyone tried this ?

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