i have a 02 DS 650 and it wont start. its cold here, normally anywhere from 10 to 30 degrees. i pulled off the carb. and its clean and it has a a different main jet in it from dyno jet. its a 175. it gets good spark. and the battery is brand new but i drained it quite a bit when i tried starting it yesterday so i put a battery charger on it. so now i am stumped. any ideas?? thanks a lot.

 

3 things to start. Spark, Gas, Air flow. Just my 2 cents. If your getting a good spark, I would check to see if it's getting gas. if it is I would check to see if your air tube/filter is clear/clean. If all three are present then it may be something like timing, or make sure you have it in the run position on the handlebars.

 

thanks yellowdemon23 i will check into the air tube and filter because i havent looked at it in awhile.

 

Adjust your air screw while you are at it - it makes a big difference in the cold, especially when the engine is cold too. Somewhere between 2 and 3 turns from gently seated will be just right - start adjusting at 2 1/4 turns and tune from there - giving a little test ride in between to clear things out.