Posted October 10, 201212 yr 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 ...
October 13, 201212 yr 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 ).
October 13, 201212 yr Moderator 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...
October 13, 201212 yr Author 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?
October 13, 201212 yr Moderator 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
October 13, 201212 yr Author ok, tomorow will do it ... thx, for now how deep i need to do that hole?
October 13, 201212 yr That's nothing Emilt, soon I will be going to see the BAY CITY ROLLERS Whoooooah!!!!
October 13, 201212 yr Moderator 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
October 13, 201212 yr P.s. Hi and i checked thx You're most welcome. Sounds like you'll have it sorted in no time.
October 14, 201212 yr Author 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....
October 14, 201212 yr Moderator 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?
October 14, 201212 yr Moderator 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!
October 14, 201212 yr Author 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?
October 14, 201212 yr Moderator 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? ???
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