i've tried everything including adjusting the carb cleaning the airfilter, changing the sparkplug. and the bike still has a hard time reving past 6000 rpm
i dont think it's time for a rebuild bc the bike has only 7000 KM on it.
if someone could help me to solve this problem it would be highly appreciated.
Reed block removed from the speedo? Even with the reed block still in place it should rev past 6000 rpm man, baz or gav will probably know whats wrong with it or at least help you fix the problem.
what did you mess with on the carb m8 cos you shouldent need to adjust nothing unless your fine tuning it ?
if your bike is stock restricted has it ever revved past 6000 since youve had it ? im not sure how they perform when restricted
if it has started recently it could be a few things is the bike smoking alot ? have you messed with the reed block? have you re jetted or messed with the needle settings ?
the more info we have the better chance of helping
yes the bike is smoking a lot and i havent touched the reed block and the only thing i adjusted on the carb was the air/gas screw and i adjusted it like this......
i screwed it all the way in (not too hard of course) and then i turned it 1½ turns counter clock wise.
PS. the bike leaves a smoke cloud if i rev the engine to 6000 rpm and i think it's running rich but im no expert thats why im asking you guys
yes the bike is smoking a lot and i havent touched the reed block and the only thing i adjusted on the carb was the air/gas screw and i adjusted it like this......
i screwed it all the way in (not too hard of course) and then i turned it 1½ turns counter clock wise.
PS. the bike leaves a smoke cloud if i rev the engine to 6000 rpm and i think it's running rich but im no expert thats why im asking you guys
i kinda feel like James bond, my Yamaha leaves a smoke screen just like bonds' Aston martin :D
Seems like I have the exact same problem... My bike is an imported one, from Germany, with the 3RM00 CDI.
Have tried close to everything, but it won´t rev past 6500rpm... New, sparkplug, coil etc...
As far as I can tell there´s no restrictions in the exhaust or at the intake side, the only thing I can think of is some kind of rev restriction in the CDI.
I don´t know actually... Was running like this when I bought it...
Smoking like crazy... Know what you mean My main jet were only size 98, so just to try, I drilled it up to 2mm and now I´m able to send smoke signals with it.
But the rev problems were before my "rejetting" and there is no actuall change after either. It´s now running very rich.
okay after some fiddling with the carb i finaly found a solution all i had to do was set up the air mixture screw properly.
Seems like my bike got too much gas and not enough air in the mixture, it hits about 7.5 k rpm now, it will still need some adjusting but now i at least know what the problem is
Air mixture screw should be set 1 1/2 turns out and should never need moving from this position. Have you checked the oil pump settings? If theres too much being burnt it wont rev out and will smoke like mad Is the bike hard to start, especially when cold.This is a sign of worn crank seals which causes air leaks and poor running and also allows gearbox oil to be burnt giving off excess smoke
Well, my air mixture screw is set at 1 1/2 turns. And when it comes to the crank seals I replaced both the bearings and seals last week, first thing I did after I bought the bike (bearings worn out).
Everybody here is saying that the standard main jet size is 240, my Haynes manual states 210? How should the jets look like, brass? Mine was a "shiny" steel with 98 and a "K" stamped on it, could it be a Kehein jet?
Well, my air mixture screw is set at 1 1/2 turns. And when it comes to the crank seals I replaced both the bearings and seals last week, first thing I did after I bought the bike (bearings worn out).
Everybody here is saying that the standard main jet size is 240, my Haynes manual states 210? How should the jets look like, brass? Mine was a "shiny" steel with 98 and a "K" stamped on it, could it be a Kehein jet?
hmm dont know about the crank seals but the bike only has 7 k kilometers on its back =P so i dont think that the crank seals are worn yet.. but then again i dont know how often you change the crank seals bc this is my first two stroke bike =O
the bike used to be pretty hard to start but it isnt anymore.
and my air mixture screw is set on 2 1/2 turns at the moment, one thing that i have noticed is that the air tube that goes from the ''filter box'' is cracked (the thick one) dont know if it's leaking air though
and please tell me more about oil pump settings i dont even know where it's located =O
found something about jets on another forum this is what it says :
think there is a mikuni 28 mm as standard on the DT, atleast on the 04 and newer.
The original jetting is 210 ( i dont know if you use this measuring in the uk though) and the jetting you want if you have Dep and that wire on the front attached to the frame (if u have 04 or newer) is 240-260.
Well, my bike is a -97 so it´s (what I think) of another generation than yours. It has the Mikuni 26mm flat-side carb. My measurements of the jets should be the same as yours (check my location )... Thugh, I think I´ve seen somewhere that some manufactures measures size and some the flow...
Anyway, will buy a number of jets tomorrow, and test to see if I can get the fuel supply correct. Maybe give a closer look at the oil pump settings aswelll...
Got a 200 main jet (210 out of stock at my local dealer)...
That made some real changes, it now revs up to 8000rpm and has a lot more torque in low/mid range (except at just 1/3 throttle when it blutters). It doesn´t rev out, feels like it still runs a bit lean. Will try to get hold of 210 - 240 jets to see if it makes a difference. Doesn´t smoke either.
So not perfect, but a BIG improvement. Haven´t had the time yet to check the oil pump but will try to do it during the weekend. Btw, the oil pump is the "grey box" positioned at the rigth side of your engine (close to the front). It should have one hose from the oil tank, one hose to the intake (between the carb and engine) and one wire connected to the throttle cable in a box beneath the tank. I´ll check for the correct settings later...
.
