emilz23 Posted October 10, 2012 Share Posted October 10, 2012 Hello, in start of summer i bought used Yamaha dt125x 2stroke, i was fun driving around & stuff, but now, when i'm reading, that this little bike must go to 120-130km/h, now i'm confusing about my 90km/h vmax. My bike specs : Mark : Yamaha Model : DT125x Year : 2006 What i have done - in this summer i bought new crankshalf, destructed rev-limiter. I have HGS pipe and DOMA silencer. One of my mate says, that i have to clean carurator. If i clean it, my little bike will go to 120km/h? Thanks. P.s. and i forgot, i disable my oil pump, now i mix 1:40 ... Link to comment Share on other sites More sharing options...
emilz23 Posted October 13, 2012 Author Share Posted October 13, 2012 Up, still have the probl. Link to comment Share on other sites More sharing options...
Sacha Posted October 13, 2012 Share Posted October 13, 2012 I'm not sure of the top speed on your bike, but I'm willing to bet it's been highly discussed before... check out Also, you're likely to get a better response from the folks here if you post an introduction in the new member section (see ). Link to comment Share on other sites More sharing options...
emilz23 Posted October 13, 2012 Author Share Posted October 13, 2012 P.s. Hi and i checked thx Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 13, 2012 Moderator Share Posted October 13, 2012 does your power valve open fully emilz? when you first turn on the key the PV should make a noise zzzt zzzt (the cleaning cycle) then come to rest with the notch in the pulley aligned with the 4mm hole in the cylinder. At this point if you take off the exhaust pipe the PV should be fully open, see the top of the exhaust port...it should be totally flat with the PV... Link to comment Share on other sites More sharing options...
emilz23 Posted October 13, 2012 Author Share Posted October 13, 2012 Yep it does that sound - i like it (i always thought that was CDI ) ... gmh - this is that Power Valve (PV) - http://i2.ytimg.com/vi/M8Hzs9HUxOY/mqdefault.jpg ? Give me some tutorial - and try to explain simply, because my english, as i sad, isnt so good, and im not understand many words ... But, yea it does that sound. How do i try if its fully open? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 13, 2012 Moderator Share Posted October 13, 2012 1 Turn on key 2 zzzt zzzt (PV cleaning cycle) STOP 3 'U' notch in pulley (1) aligned with 4mm hole (2) clear picture of 4mm hole (2) 4 Take off exhaust pipe 5 see the top of the exhaust port...it is smooth. The PV is open wide Link to comment Share on other sites More sharing options...
emilz23 Posted October 13, 2012 Author Share Posted October 13, 2012 ok, tomorow will do it ... thx, for now how deep i need to do that hole? Link to comment Share on other sites More sharing options...
mike1949 Posted October 13, 2012 Share Posted October 13, 2012 That's nothing Emilt, soon I will be going to see the BAY CITY ROLLERS Whoooooah!!!! Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 13, 2012 Moderator Share Posted October 13, 2012 ok, tomorow will do it ... thx, for now how deep i need to do that hole? The hole is there already. I can see it in your picture Link to comment Share on other sites More sharing options...
Sacha Posted October 13, 2012 Share Posted October 13, 2012 P.s. Hi and i checked thx You're most welcome. Sounds like you'll have it sorted in no time. Link to comment Share on other sites More sharing options...
emilz23 Posted October 14, 2012 Author Share Posted October 14, 2012 Hey, airhead, you can invite me in skype - emilz23 so you can help me faster ... ghm i took some vids of my PV and that thing in cylinder. Uploading.... Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 14, 2012 Moderator Share Posted October 14, 2012 sorry emilz dont do skype Link to comment Share on other sites More sharing options...
emilz23 Posted October 14, 2012 Author Share Posted October 14, 2012 Link to comment Share on other sites More sharing options...
emilz23 Posted October 14, 2012 Author Share Posted October 14, 2012 airhead - google chat? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 14, 2012 Moderator Share Posted October 14, 2012 Thats OK emilz just as it should be Now you have the exhaust off, is there a restriction tube inside the neck of the pipe where it attaches to the cylinder? Link to comment Share on other sites More sharing options...
emilz23 Posted October 14, 2012 Author Share Posted October 14, 2012 Nope, there are no that kind of stuff ... Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 14, 2012 Moderator Share Posted October 14, 2012 Well did you fit a bigger main jet in the carburettor...what size is in there right now?...with that new exhaust I would fit a bigger one also there is a wire connected to the CDI that will require earthing to the chassis or battery negative, this wire goes to one of the plugs at the speedo, it is black/green ...make a connection from this wire to chassis. This should have great effect. Dont forget though...fit a bigger jet in the carb or you will be back with photos of a melted piston! Link to comment Share on other sites More sharing options...
emilz23 Posted October 14, 2012 Author Share Posted October 14, 2012 I have destructed that wire ... i dont know what size is that main jet in carb! And one spec says, that i need to chenge piston and rings soon, is that can be problem? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 14, 2012 Moderator Share Posted October 14, 2012 I have destructed that wire ... i dont know what size is that main jet in carb! It may be 210, you will only know by checking it, try a bigger one but I dont know how much bigger...I would try a 230 or 240 it's better to be too big than too small! And one spec says, that i need to chenge piston and rings soon, is that can be problem? ??? Link to comment Share on other sites More sharing options...
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