The Secret to Power Valve Tuning on KTM, Husqvarna & GasGas 2-Strokes

Having your bike setup for your specific style of riding and terrain is key to getting the most out of your motorcycle. Luckily, KTM, Husqvarna and GasGas make it easy with their adjustable power valve design that changes the power characteristics of your engine. In this video Charles shows how to adjust and tune the power valve on KTM, Husqvarna and GasGas 2-stroke motorcycles.

Click Here To Subscribe To Our Channel!

Follow Rocky Mountain ATV/MC On Social Media!

[slagletoby]

I was waiting for the secret. If you take the pipe off and fully open the powervalve manually you’ll feel a slight deviation, or a lip, where the powervalve flap meets the last section of exhaust manifold. During your next round of maintenance when the head is off the bike and you’re doing powervalve maintenance you may visibly see this deviation. All 2T KTM might not have it, mine did. Simply Dremel down the manifold edge until it’s perfectly flush with the exhaust flap, plus polish it to a Crome finish. You’ll notice the torque!
And of course always set the Z-dimension.

[wfodavid]

Nice video and so simple. Amazing how little info there is on the web about this. Thanks!

[andymencel]

Rather than the fancy “Robertson” tool, a flat head screwdriver fits right in there corner to corner

[gophop]

The more preload you give it, the snappier pipe hit will be. Yes, you delay it by a few hundred RPMs. But when the switch happens, it will be violent. If you remove most of the preload you can (softest 2ndry spring - red, and adjuster spun out to flush with the case), you'll get the smoothest transition to the pipe. It will be linear compared to a typical 2-stroke hit. I recommend that for traction.

[jswervy]

Ive got a rich spot just before the Piwervalve opens at 1/4 throttle. Any tricks for smoothing out the blubbery spot?

[chalo]

I traded my TPI bike for a SX250... Power vauve adjustment is only by spring or also by using this tool?

[mikeleis]

On any carbed 250 I’ve ridden, I put the red spring in there and pull the adjuster out flush with the case. Definitely worth trying if your on a 250 woods or mx.

[ken-evuk]

Maybe I am crazy but i like to un tied the tension of the spring to get more torque by riding a higher Gear and have a quick respond when needed in lower gear, is that logical are am I really nuts ??? Thanks for some feedback.

[seb]

What about the little black grub screw near the exhaust header. Does that make any adjustments? What's it's purpose?

[sladegrady]

Are you able to change the power valve springs on 125’s?

[TheAbbott]

Any videos on how to set this up to stock setting with the tool

[danortiz]

its weird in my 2019 ktm 250sx when i give gas i don't feel she respond like she was before, i clean the carburetor good and still feels the same any recommendations

[charliekohn]

Everybody using a flat head o
Say Roberson wrenches are rare. Trades just see a square drive think it was a #3 or 4

[adambatchelder]

Actully backing off pre load and running a softer spring (red) gives the bike a smother delivery.

[sjeppesen]

Kreft power dial gives you trailside with no tools

[Crazystuffyousee]

I guess we're all different but I run the red spring and the adjustment all the way out flush with the housing. I'd rather not have the bike help me do what I can do myself with the throttle...🤷‍♂️

[robhayter]

What way would I turn this for a carb bike for a more aggressive hit ?

[mitchellperry]

The secret is to not let it catch your piston and smash your whole engine to bits.

[bennelson]

Is that a Tusk skid plate for the xc? I can’t find that in your website

[MxRider]

TPI bikes actually do have springs and you can change them out. Not sure why RMC is pretending you can't, but I've heard the manual tells you not to.... who knows why they