Power Now Valve??

7 replies to this topic
  • Speedracer42

Posted July 23, 2006 - 01:01 PM


I am new to the 4-stroke world and have been hearing about the Power Now Valve? Has anyone here used one? I have the 2006 250f and wonder if it is worthy of a $100 investment. Thanks for the feedback.

  • 06thumpy

Posted July 23, 2006 - 05:58 PM


i have both the powernow and powernow plus thats 200 bucks i like them and wont be taking them out anytime soon. i could tell a difference in bottom end with the powernow but i couldnt really tell a difference when i added the powernow plus. if you are going to get just one get the powernow (airbox side).

  • Lawur2

Posted July 27, 2006 - 06:59 AM


Have used the Powernow on my KX250, '05 KX250F, and now on the '06 KX250F. It works. Would recommend it to anyone that I don't have to race against.

You will need to rejet your carb.

  • MarkSims

Posted July 27, 2006 - 09:38 AM


Lawur2: What changes did you make on your jetting for the 06 when you installed the powernow? My jetting is currently stock in Atlanta, but I was thinking about trying a 42 pilot jet. The plug color looks perfect.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Speedracer42

Posted July 27, 2006 - 10:02 AM


Have used the Powernow on my KX250, '05 KX250F, and now on the '06 KX250F. It works. Would recommend it to anyone that I don't have to race against.

You will need to rejet your carb.

I already have a full exhaust system and the bike has been rejetted perfectly for that. Will I need to do it again?

  • binder929rr

Posted July 27, 2006 - 11:40 AM


it only does something to the bottom end. once you crack that throttle full open the airflow is full so the power now doesn't do anything. it only reduces turbulance in lower throttle settings by blocking the air from hitting the entire slide. I don't know of a race yet that i'm below 1/2 throttle. I noticed nothing increasing on my friends 05 crf250 when he put both of them in there. when i was playing around the woods it did help the low end sputter but that was it, on the track nothing.

  • Lawur2

Posted July 27, 2006 - 08:23 PM


Jetting changes will depend on other changes you might have made to exhaust, porting, carb, etc.

On my '06 with a full Yoshi system & Boyesen pump I run a 42 pilot & 174 main. Bottom line is that I suggest you go up one size on pilot (if you haven't for other reasons) and decrease your main (if you haven't for other reasons). Thats in south central Tennessee region.

  • ThumperMx365

Posted July 28, 2006 - 05:18 AM


Pump 93. My jetting specs for my 06 Kx250F at Sea level is, 170 Main, Stock Pilot, JD Red Needle with Clip at 4th position. Changed Leak jet from the stock 55 to a 50 and my Air screw is at 2 1/2 turns out. I also have a Boysen Quickshot and a Powernow.

Related Content


2004 KX250F looks in time, has fire and fuel, but won't start by jonee16

Dirt Bike   Make / Model Specific   Kawasaki   KX250F
  • 15 replies

KX290F minimum Squish clearance by charper

Dirt Bike   Dirt Bike Technical Forums   Engineering and Technology
  • Hot  45 replies

kx250f exhaust recommendations? by DeviousPete

Dirt Bike   Make / Model Specific   Kawasaki   KX250F
  • 0 replies

Good four stroke pistons that last by runthemhot250

Dirt Bike   Make / Model Specific   Kawasaki   KX250F
  • 8 replies

2 stroke enduros by 2010crf

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • Hot  82 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.