im having a problem with my 2001 ds650 it will start up fine but after a couple seconds it starts sputtering and i cant get it to rev up i had this problem last week it ran good for about an hour then it started sputtering and bogging i just changed out the plugs today ive also swapped out the rectifier and cdi thanks cynic for the cdi and bombdsbaja for the rectifier but its still not running right ive also drilled a hole thru the gas cap so there is fuel flowing im running out of ideas here and im taking the bike out on friday so any help ill be greatly appreciated thanks.


jonathan

here a video of the problem

ds650 sputtering

 

How big of a hole did you drill in the gas cap?

I would pull your jets out and look for debris since it will cost nothing and make sure the hole in the gas cap is filtered somehow.

The fact that it runs ok for a few seconds then goes to crap is interesting and indicates an electrical problem. Do you have access to another cdi to test?

Also, make sure your plug wires snap tight. Make sure they don't vibrate loose and jump around because they are worn out.

To be honest, it sounds like spark timing is getting erradic after a few seconds and that would most likely be CDI.

 

I hope it isn't the CDI it worked fine when it came off of Seth's bike. I wouldn't think it would just go bad because it is on his bike but if it is I am sorry.

 

i just finished the cleaning the carb before i took the video the hole in the gas cap is about the size of a ball point pen. the spark plug wires are on there tightut it still sputtering.



jonathan

 

does it start puffing black smoke when it starts sputtering? sounds like it gets totally fat to me . maybe the vibration from the engine running is making the carb overflow down the throat. I would pull the carb carefully without turning it upside down and pull the bowl without dumping it and make sure there isnt a small pudle of water in the bowl which gets sucked up when you rev it . you can see the water because it as is seperates from gas. have had it happen when someone washes their bike alot. also make sure your main jet isnt laying in the bowl as I have seen that happen before also. you should also pull the float needle and make sure there arent any foreign objects or debris which could keep the fuel from shutting off.

 

i was having the same problem when i got your cdi it did get better for a little bit but it still sputterd i hope its not the cdi to beacuse i have no idea where im going to get another one before friday lol.

 

no black smoke i compleatly dissasebled the carb and cleaned it. im running a 175 main a 45 pilot and the stock needle in the 3rd clip position.

im runnig out of ideas is there anyway to test the rectifier and cdi to check see if there still good thanks again for the help.

 

I had the same problem when I piped and jetted my bike. Try switching your jets from one side to the other, they are threaded the same and will go into the wrong holes. When I jetted mine it did the exact same thing cause I put the jets in the wrong holes.

 

the needle goes into the main jet right.

someone also told me the batery might be bad but it cranks the bike over fine i have connected to the battery tender and its on green saying that i have a full charge so i guess its ok.

also do you guys think it might be a loose ground cable i have no idea where this cable is thou.

one thing i should add i once got the bike stuck in water upto the seat but i let dry and it started up fine this was about a year and a half ago and since then i replaced the cdi and rectifier with a diffrent set and cleaned up all the terminals im running out of ideas.

 

Is your needle seated in the slide properly... if it pops out it can act like yours did on the vid. Also what are you messing with at the throttle when you are starting it up?