I just bought a 01 650 and it had a burnt CDI, I replaced it with another CDI off a 2000 650, It didnt run quiet right and i was told to move the clip on the needle to lower the needle. I have good throttle response but no top end it sputters when you get the RPMs up kinda like a rev limiter or lack of fuel runs great if you move through the gears. just lacks alittle on the top..... any ideas is it electical or jetting or what?

thanks for you guys help much is needed and very appriciated

Steven Smith

 

Does it sputter out at a low RPM or does it rev like it is supposed to? The early models 00 and 01 had a low rev limit, i fixed mine by installing a vortex cdi and that fixed that part, as for the rest we will know in a very short while.

 

runs out well at low RPMS no sputter, it sputters when you get to the top of each gear!

 

there is a vent line that goes rapped around the tank mine was kinked and i was having the same symptoms you have you might want to give that a try.

also check your plugs they might be fouled.

 

I just found out today that my problem is due to the CDI Rev limiter... anyone have any info in this??? would be greatly appriciated...

steven

 

How did you find out it was the cdi?
When mine went bad i couldnt even keep it running.
The big gun cdi is a inexpensive alternative to the others
and works well also.

 

I went into a ATV shop today and talked to the mechanic he told me that the CDI rev limit on the ds650 was set real low causing it to bang out it higher RPMs in order to fix the problem i should go with a MSD rev box witch bypasses the rev limit on the factory CDI or find a CDI off a Baja...? My question is..... would a big gun CDI or procom CDI do the same thing or is there rev limits low also?? the MSD box is $650 vs. $100 for big gun on Ebay........

 

The big gun raises the limit a little over a grand on the 04.I dont know how high it will
raise it on the 01

 

Make sure you do your research to get the Baja CDI to work... there are a couple different configurations of the wiring harness. It will only raise your rev limit from 7700 to 7900rpm... not really worth it if you ask me. Get the Big Gun.. it raises the rev limit 1500 rpm. Stay away from the Procomm, the timing curve is too advanced at low rpm... do some searches for Procomm and you will see the issues. If you plan on any major mods in the future get the Vortex... its programable.

 

I too found out about the wiring harness being different, I bout a Procomm for a baja and it wasn't the same plug. Traded it for the right one, but it cooked my rectifier. Spent the $400 like I should have in the first place and got my Vortex, no problem since.