Been for a good ride green laning today with a mate. And on way home my dt 125r kept loosing power at about 5/6 thousand revs? Anyone know what it could be?
Had a look on forum and can't seem To find anything? It gets to upto 5 6 thousand revs and sounds likes its dying and cutting out so had to hold it on revs!
Open the haynes manual to "fault diagnosis" and run through those steps first. Things to check would be,
Powervalve (take the cover off and turn the ignition, it rotate a couple of times) Carb, it could be that its not the revs that are relevant to the issue and throttle position, meaning jetting is not right. Try reving it above 5-6krpm without turning the throttle past 1/4, let it build.
Can't be power valve if it's revving past 6k, can't be jetting either if it was working ok before lol. Could be a blocked jet or air filter if you've been off road? Or might need a new spark plug, mine's started spluttering around 6k before and it was just the plug. Id try that first.
Can't be power valve if it's revving past 6k, can't be jetting either if it was working ok before lol. Could be a blocked jet or air filter if you've been off road? Or might need a new spark plug, mine's started spluttering around 6k before and it was just the plug. Id try that first.
He doesnt say whether it goes passed 6krpm. He says it gets there and starts losing power. Of course it could be the powervalve. If the powervalve was malfunctioning it could be closing the port off at 6krpm and this would dramatically kill off the power. It was, after all, a Yamaha restriction on some bikes to turn it 180 degrees and pin it.
True that the jetting settings cant have changed but I meant that the pilot jet might be clear but the main jet may have dirt in, hence once it swtiches to the main at 1/4 throttle the problems arise.
Definitly start with the plug but even if that fixes it, do some checks and get to know the bike. You could replace the plug then foul it again or find a temporary fix to a bigger problem.
H.e.d is that the spark plug lead? I'm thinking it could be water as I was goin Threw some big puddles! And iv orderd a new air filter. Not tryed it since Saturday so it's had chance to dry out going to give it a try after work today!
