Yamaha 2003 wrf 250 start probs startermotor easily turns over motor but very rare 4 bike to start kick starts ok but abit hard to start cold

Not sure of the age of your YZ 250 ( You never said!) but in most Yamaha they use dual stage stator which means a stator will charge a spark plug at two speeds one on kick starter speed and the other on running speeds it is common that the low speed circuit on the stator to fail leaving you with a bike that only starts when pushed its a very simple test to diagnose it be worth checking you have spark on kick starter speeds with spark plug out the motor but still connected

if the bike push starts, i assume it runs good,
if the kick does not turn motor over, there is a spring clip that engages the kick gear that may be broken or misplaced
if the kick start turns the motor over, you have to use decomp to get just past TDC then kick

Any of the yz and wrf 250 and 426 ,450 will overheat and water will come out of the radiator if you let it sit and idle.After a hard run it happens quickly.20 seconds.After a cold startup,5 mins.If you own one of these bikes,turn it off after TEN seconds of idling.ESPECIALLY after a hard ride.Basic rule.They do not like to idle.They need air over the radiator......Hope this helps

Any reason you had to change the jetting??New pipe,Intakes.?But,even though you may have it a bit rich on idle the pipes WILL get very hot,very quickly without some sort of air flow over the front of the motor and radiator.At the very least,have a strong fan blowing directly on the front of the motor if you are going to let the bike run and you are not riding it.I have seen the white plastics in front of the radiator distort from the radiant heat.Don't idle them for in more then 20 seconds.It can do heaps of damage.Ride the bike and see if its running well.When you stop,turn it off.All the yz and wrf will get very hot at idle.Hope this helps

There is a sequence to follow when these bikes are hot to get them started.But first.Does the bike start easily when hot if it is push started? If the answer is yes,you need to use the hot start pull switch on the carby and the get the motor in compression before you pull in the small compression lever and slowly push on the kickstarter halfway down.Release lever and fully kick the motor over from the top of the kickstarter.Don't let these bikes sit around idling.They will overheat because they need air to get through the radiator.Hope this helps

Check the condensator of the motor bike probabli it is not saving enogh energy for the spark

I haven't seen any on-line free manuals. (And I have looked) Clymer or hayes are decent ones, but the factory one is the best.

i used to own a yz426f and it had the exact problem... a fresh plug will fix your problem. change the plug and the bike will run great. also don't start the bike and shut it off , my bike would be fine if i started it and rode for a while getting to the proper heat range help save the plug. if my bike didn't start in one or two kicks it was usually the plug.



hope this helps

I've got the manual for 2002 WR250FR.

Not sure if that will help you or not?

Did you want it?

possibly water in your fuel.... it's a small tank so just put about a quarter bottle of gas line antifreeze in the tank... it's alcohol so it will **** up the water. there is also the possibility the fuel is somewhat dirty... change the fuel filter as well

Robert