Dirtbike wont start what could be the problem

that bike is simple and not much can be wrong, check the coil, the wire where the plug goes, check the points, service manual

www.manualsonline.com/mfg.name/make/model/starter_problems
www.ask.com/1971yamaha250/fix_start_issues/

I hope I read your question incorrectly, because it sounds to me like you swapped the negative & positive terminals around.. which may have burned the cables internally. If so, an Auto-electrician may be required

Points or electronic ignition? Corroborator, or fuel injection? Was the car sitting idol for a long period of time, say, 6 months to more than 1 year? With a car that old, I would start with replacing spark plug and ignition wiring. Have you checked the spark plugs? Make sure they're cleaned and gaped. If corroded, replace them.

hiya

sounds like your kill switch has fused put a meter on it to check

hope this helps

John

I have a suzuki 2005 dirtbike 250 4 stroke I can't find my manual anyone have that i can download or do you know where the spark plug is? it won't start

I'll start with the obvious.... have you tried removing the plug, putting a little gas in the cylinder, putting the plug in and wire back on and then kicking it over? If it starts, runs for a couple seconds and dies (burns off the gas you just put in there), it's a fuel or fuel delivery problem. Has the carb been cleaned, the needle and seat checked, the float height checked, air passages cleaned out, etc.? These carbs are famous for getting gummed up after sitting a while. (I have 4 dirtbikes and clean the carbs every spring before firing them up for the first time). Is the oil to fuel mix ratio correct? Too much oil will cause this as well. If it doesn't start with gas poured in the cylinder as mentioned above, check to see how strong of a spark you have and if the plug is gapped correctly. The spark should be bright blue. Hopefully you know how to check this, but if not, take the plug out, put the plug wire back on the plug and lay the electrode end of the plug (spark end) up against the cylinder head with the end of the plug touching metal and kick the kick starter over. You should see a bright blue spark. If it's a weak spark (not bright blue) it's an electrical problem such as a faulty coil. (WARNING: DO NOT HOLD THE PLUG IN PLACE WITH YOUR BARE HAND when kicking it over. You will get zapped good if the coil/spark are ok.) Try these troubleshooting tips and then let us know the result. We'll go from there.

Possible incorrect spark plug or air to fuel ratio out

LOCATE SPARK PLUG LEAD REMOVE CAP FROM SPARK PLUG AND USE A SPARK PLUG SPANNER TO GENTLY REMOVE PLUG BUT REMEMBER WHEN YOUR REFITING SPARK PLUG NOT TO OVER TIGHT PLUG ,NOT TO MUCH PRESURE .

have you checked the reeds inside the induction side if they are corroded from sitting it will cause that problem, also check the spark plug, may just be a case of weak spark ,if still no good check the coila good way to test if it is a spark problem get a can of aerostart (wyns start ya bastard) and spary a little in carby, should start real easy. if so then spark is your problem. also just thinking check tat your exhaust has not collapsed inside itself or is blocked, that can cause no power too. hope i have been of some help.

head gasket is bad. check for damage due to ever heating, or loose bolts if some one worked there before.