hello i was wondering if anybody can help me with my yamaha dtr 125,it is a 2000 w, ive had it about six months and it has a big one silencer with what i believe to be the standard front pipe (been operated on id say) just lately the powervalve (only now and then) seems to be struggling, and the exhaust is sounding muffled and restricted like a standard pipe, i have to really screw it at times and then out of nowhere the powervalve will fire on and its off again then for no reason the exhaust goes really tinny like a rm i dont really mind that it sounds ok but as soon as the powervalve kicks in it starts to run fine again im thinking it wants de cokin or do you think carb or even spark plug ......this only happens when the bike has been ridden and is hot goes from fine to muffly to really tinny to fine to muffly...!!! you get the picture it runs fine otherwise and doesnt cut out help plz its gettin me down cheers
Sounds like the powervalve is at fault some where. Have you checked the workings of it like cable tensions and valve alignment? Might be the valve bushings have gone. Just a thought but check the header bolts on the exhaust. Mine have come loose one day and it was like riding a bucking horse.....took me ages to track the problem!
Let it warm up prior to riding it, i to had this problem because i used to jump on a ride with out giving the engine chance to warm up. Also charge the battery, if its slightly low that can to effect it. (speaking from experience with the same problem)
thanks very much it is funny you mention battery as i looked at this when i first got the machine and it looks quite old i also have had my lights on since i got the bike and i can be a bit of a sucker for riding off from cold (the battery terminals are full of **** i will order a new battery thanks again baz at leeds
no problem. i noticed my battery problems once when i switched the key on and off a few times, some times the servo did'nt operate a new battery fixed the problem! i was well chuffed =]
took the bike out on saturday, warmed it up properly, i didnt use the lights i had it on the road it was fine no probs i took it on the local quarry and it was awesome didnt let me down once and it sounded mint and it took some punishment a good few hours of 1st 2nd and 3rd havent got round to ordering a new battery yet but i will im gonna give it a service before it goes out again cheers again baz
also noticed had a loose wire on back indicator so loose infact kept noticing it working one minute and not the next on closer inspection i found that shorting these wires resulted in the powervalve operating even with machine switched off rewired it and result no problems with powervalve back up to 80 mph everytime no bother chuffed baz atleeds ps how do i put a sorted stamp on it
you did and gratefull i am,i am 85%convinced it was the indicator does that sound like a problem diagnosed 100% i have been out on it today and it was fine even with light on,also warmed it up 10-15 mins prior to riding, thanks baz at leeds .......plz have a look at the guy with the problem with the oil light on in neutral and correct me if im wrong (i know its supposed to be on) thanks again and if ive anymore problems i will call on you if thats ok
hi, I also am having power problems with my 2003 dt 125. I've been reading up on the power valve and servo system. which mine has, but it is off road spec with no battery or main wiring loom. so the servo is not working. is there any way i can get around this problem without fitting a wiring loom / battery??
