I just bought a 2002 Baja 650 with a slip on pipe. I knew it was not running right when I bought it. It starts perfect but as soon as I hit the gas it cracks and backfires. Seems to be backfiring from the carb. I took the carb off and broke it all down. Took the jets out (170 and a 40). Cleaned everything and blew air through everything. Assembled it and still getting the backfiring, hard cracking. It will not rev out at all. I took the plugs out and they were black. Put new plugs in and still nothing. Now it will not even run without the choke on. I adjusted the pilot screw to 3 1/2 turns when I assembled the carb. I tried screwing it in and out with it running and nothing will happen, the engine stays running with it all the way in or out. I took the gas cap off to see if it wasn't getting air and nothing. Took the airbox cover off, nothing. I am supposed to be going riding Friday for a few days and would like to get this running right. Any help would be appreciated.

 

Ok. I took the carb apart again. Cleaned everything with cleaner and air. Changed the oil. Flushed the radiator. Put everything back together and now it wont start at all. I am lost. I dont know where to go next. Any idas would be appreciated. Thanks.

 

Go to ds650.org ask again there. 2 1/2 is stock. I got a cdi, pipe, jetted, omr carb mods & i think im only at about 3 turns on screw.

 

Carb clearners are known to swell the carb seals etc. My choke circut has been givin me problems since i carb cleaned it. Had to replace my float needle and seat after too cuz it wouldnt stop drippin

 

Did you check to make sure you had a good supply of fuel going to the carburetor?

 

Read the omr stock carb mods located on this forums stickeys. Sounds like your floats are out of level.

 

make sure your battery is good and the cables are tight sounds like a battery conn problem

 

Diaphram on the top of the carb is probably shot..