pc_wiggum

Hi i have a DT125 74 and having the same problems, have posted about it before under 'DT125E troubles' had some responses (thank you) and tryed them. Still not working, same as above ticks over fine, kicks up first kick but runs like a bag of Sh**t when i open her up. boggs out and loses power. I tryed loosening the exhaust and running with it not conected properly to see if it was blocked (you up there, hi, could try that to see if the exhaust is blocked, makes a hell of a noise tho ) but still ran the same. Any ideas? (rasme360) If i work anything out on mine will let you know tho buddy and if you do please let me know also. Thanks

Hi, thanks for the help, Im pre-mixing and diconected the pre mix just to be sure i have the right mix, im using 2%. when you say needle valve it that the needle jet or throttle valve??, sorry for my ignorance but im new at this and working from the termanology in the manual. I have got a new main jet so know thats standared, i am trying to locate a new needle jet but yamaha has discontinued them? any ideas? ??

Hello, I have a 1974 Yamaha DT125E and havening issues. I have it so it kicks over and idles ok, runs until you get to 20-25 mph and it bogs out. Every time I open it up it runs boggy. I have cleaned out the carburettor and checked the fuel runs freely, I have fited a 150 main jet as that was recommended by Yamaha for the bike (although I have tried a 250, 190 and 115) none of which make a difference? I have fitted a standard air filter also as suggested by Yamaha to insure the correct amount of air is getting through. Now I am stuck, any help or ideas would be very very appreciated.