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power valve

  1. Motorcycles
    Took everything completely apart to clean and just don't remember which way the mechanism moves when opening the exhaust valve wide open. Thought you would be able to help. BTW I did install several ways and this seems like the only way the valve will open and close properly, Thanks, Rob
  2. General 2-stroke Info & Everything Else
    So how do they increase power output for low rpm, is it : 1) The decreased exhaust port area optimizes flow for the tuned speed to prevent over scavenging 2) The decreased port height gives the engine a longer effective power stroke With this I was wondering, if its the case that it prevents...
  3. Motorcycles
    I have a 1985 yz250 with a 1983 yz 250 engine. i just rebuilt the hole engine. I am having ideling *and hard start problems. The bike has a small idle surge at times and it does not want to stay running all the time at idle. i adjust the idle and its ok for awhile then it changes again. the carb...
  4. Suzuki Dirtbikes
    Hey all im new to the board, i dont know much about bikes or well 2 strokes motors in general and am trying to learn as much as possible. So i do a compression test on my r91 rm 125 and get about 70 psi. I rip apart the motor to find the powervalve was never hooked up. The piston is completely...
  5. Suzuki LT500
    Hello all I have a 87 lt500r I lost the rod to the power valve which position should the lever that the rod hooks to for the PV to be set to for top end performance? As in lever pushed up or pointing down. The motor is worked so no need for it. I seen in some older post that some people made...
  6. Yamaha Dirtbikes
    I have a '90 YZ 250, and need a few parts to make it whole. I have an 85 motor that runs, however it needs a pipe, and a Power Valve cover. It is also missing the (rear) shock. Anyone have an old pipe? Shock? Does more than one year fit? I would assume anything from the era will fit, as the...
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