nedery Posted February 7, 2010 Share Posted February 7, 2010 when power valve kicks in bike starts to stutter, can the power valve get stuck? how do you go about fixing it? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 7, 2010 Moderator Share Posted February 7, 2010 when power valve kicks in bike starts to stutter, can the power valve get stuck? how do you go about fixing it? Nice intro Link to comment Share on other sites More sharing options...
nedery Posted February 7, 2010 Author Share Posted February 7, 2010 Nice intro what you mean nice intro Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 7, 2010 Moderator Share Posted February 7, 2010 what you mean nice intro If you cant see what i mean then it doesnt matter, try a Haynes manual Link to comment Share on other sites More sharing options...
nedery Posted February 7, 2010 Author Share Posted February 7, 2010 If you cant see what i mean then it doesnt matter, try a Haynes manual thanks for the help! Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 7, 2010 Moderator Share Posted February 7, 2010 thanks for the help! Youre welcome However someone who knows more than me may add to my offerings. Link to comment Share on other sites More sharing options...
JYA12R Posted February 7, 2010 Share Posted February 7, 2010 So, is the power valve the intake valve or the exhaust valve? Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 7, 2010 Moderator Share Posted February 7, 2010 So, is the power valve the intake valve or the exhaust valve? Its a well proven servo driven rotary valve in the exhaust port that makes considerable changes to the exhaust port size and profile. Its probably just a duff plug or low battery voltage. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 7, 2010 Moderator Share Posted February 7, 2010 So, is the power valve the intake valve or the exhaust valve? Its a two stroke engine, the power valve effectively changes the height of the exhaust port to give maximum power at different RPM's, ie a lower port for low RPM's and a higher port for high RPM's, it mas an electrical servo motor to match the power valve position correctly to the current RPM value. Link to comment Share on other sites More sharing options...
JYA12R Posted February 7, 2010 Share Posted February 7, 2010 Its a well proven servo driven rotary valve in the exhaust port that makes considerable changes to the exhaust port size and profile. Its probably just a duff plug or low battery voltage. But it would make a BIG difference on a 125, the valve that is? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 7, 2010 Moderator Share Posted February 7, 2010 But it would make a BIG difference on a 125, the valve that is? Gives the motor more flexibility, better power output over the range of revs, rather than just one defined power band, at least thats my view of it. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 7, 2010 Moderator Share Posted February 7, 2010 But it would make a BIG difference on a 125, the valve that is? It makes the low rpm power (relatively) much stronger on a restricted 12hp bike. On the full power versions its vital to keep the motor rideable, without it you have one extreem or the other. Link to comment Share on other sites More sharing options...
nedery Posted February 7, 2010 Author Share Posted February 7, 2010 Its a well proven servo driven rotary valve in the exhaust port that makes considerable changes to the exhaust port size and profile. Its probably just a duff plug or low battery voltage. been happening consistantly for a long time now. plugs alright battety is fairly new. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 7, 2010 Moderator Share Posted February 7, 2010 Gives the motor more flexibility, better power output over the range of revs, rather than just one defined power band, at least thats my view of it. Yep, you put it better than i did OG. I can hear the valve on my TDR changing as i ride. At least at lower sub warp rpm. Above 6000rpm on a large throttle opening i frankly couldn't give a monkeys what its doing so long as it keeps doing it. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 7, 2010 Moderator Share Posted February 7, 2010 been happening consistantly for a long time now. plugs alright battety is fairly new. Hows the air filter. Does a bit of choke make it better or worse. And, when was the last time it had a good l o n g blast to clear out the tubes. Link to comment Share on other sites More sharing options...
nedery Posted February 7, 2010 Author Share Posted February 7, 2010 Hows the air filter. Does a bit of choke make it better or worse. And, when was the last time it had a good l o n g blast to clear out the tubes. choke makes no odds, it kicks in the revs get to redline and it's like the power shuts of then comes back repeatedly till you grab the clutch Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 7, 2010 Moderator Share Posted February 7, 2010 choke makes no odds, it kicks in the revs get to redline and it's like the power shuts of then comes back repeatedly till you grab the clutch Its supposed to do that, its the rev limiter stopping the engine from destroying its self. Link to comment Share on other sites More sharing options...
2 Wheels Posted February 7, 2010 Share Posted February 7, 2010 How do you know the power valve is at fault? Did you have the cover off and watching it to see or what? EDIT: sorry Cynic didnt see your post. Yes it is supposed to do that. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 8, 2010 Moderator Share Posted February 8, 2010 How do you know the power valve is at fault? Did you have the cover off and watching it to see or what? EDIT: sorry Cynic didnt see your post. Yes it is supposed to do that. i had the same on another topic with OG. Link to comment Share on other sites More sharing options...
Guest MaD.VeZ Posted February 8, 2010 Share Posted February 8, 2010 Its supposed to do that, its the rev limiter stopping the engine from destroying its self. Strange as mine just revs and revs, no fluctuations like a rev limiter would cause. Destroyed the odd engine or two before now . After though: Unless its the model with the speed restriction. http://www.dtr125.net/tuningf.htm < try here nedery , select your year at the top. (if you haven't already). Link to comment Share on other sites More sharing options...
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