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speedshop34

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About speedshop34

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    TT Newbie

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    Georgia
  1. speedshop34

    YZ250 Power Valve Push Rod

    The dowel is in place. All shrapnel has been cleaned out from the case. There was just one clean break on one tooth. The bike is an 06 but only has just over 40 hours. If you look at the attached schematic for the governor, http://www.motosport.com/dirtbike/oem-parts/yamaha/2006/yz250/governor part 19 had very minute minute grooves worked into it from the washers and bearings moving back and forth during engagement. Little wet sand and the power valve opens like a charm now! Thanks guys!
  2. speedshop34

    YZ250 Power Valve Push Rod

    The governor hasn't been apart lately. This did happen after some wrenching on the bike, but not until 3.5 hours. The gear that drives the water pump dropped a tooth and it got stuck in a shift fork and I had to replace. I didn't disassemble anything on the power valve during this wrenching, and the bike ran solid for several hours before I started having this issue. When I inspected the governor a few times yesterday everything seems to be working properly. No cracks or excessive wear. Spring has plenty of tension
  3. speedshop34

    YZ250 Power Valve Push Rod

    Silencer packing has minimal hours on it. I just checked both the header and silencer for buildup/blockage even though the full system has less than ten hours. New spark plug. Carb has been cleaned twice and functioning properly. I actually put it on another yz in my shop and it functioned perfectly. 98 octane gas. New air filter. Top end power loss can come from exhaust plugging but I think it is my power valve since it is never actuating. The engine will rev high enough to open the linkage. I am 100% sure the linkage isn't moving while bike is running, I have the cover off. I am also aware the you don't have to ride the bike to see the linkage work since it is driven by rpms. Thats why I mentioned I am able to move the linkage with pliers while it sits on the stand and you can really fit the bike open up and hit the power band.
  4. speedshop34

    YZ250 Power Valve Push Rod

    Thanks for the help so far. I actually took off the right side case cover TWICE today and inspected/re-assembled the whole mechanism. Everything was thoroughly inspected. I am still at a loss here....anything else I could try?
  5. speedshop34

    YZ250 Power Valve Push Rod

    Thanks for the help so far. I actually took off the right side case cover TWICE today and inspected/re-assembled the whole mechanism. Everything was thoroughly inspected. I am still at a loss here....anything else I could try?
  6. speedshop34

    YZ250 Power Valve Push Rod

    Thanks for the help so far. I actually took off the right side case cover TWICE today and inspected/re-assembled the whole mechanism. Everything was thoroughly inspected. I am still at a loss here....anything else I could try?
  7. speedshop34

    YZ250 Power Valve Push Rod

    06 yz250. Bike was running normal until I lost all top end power. It was as if the bike was getting choked. First thing I tried was to pull of the push rod side cover and ride the bike to see if the power valve was functioning properly. The arm wasn't moving and the valves weren't opening. I can move it freely with my hand or with a pair of pliers while idling and it will open up. I disassembled the power valve and inspected/cleaned thoroughly. I shined a light up the exhaust port and can see the middle slide opening first, then it becomes slightly harder to move by hand as the other two slides open. All parts were re-assembled with a light oil. Everything feels smooth when I try this by hand. Not sure what is going on to cause it from opening on its own?? I'm completely lost here and have the itch to twist some grips. Any suggestions?
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