A forum for owners of Yamaha TTR250 trail and enduro bikes!

Thanks. The starter turns the motor over, but there's no spark. It's had a recent sprag clutch replacement anyway.

I can only think that the electrical power is somehow draining. Earths and regulator have been checked.

https://ttr250.activeboard.com/t43817790/woodruff-key/

If the woodruff key in the flywheel has sheared, the flywheel position on the crankshaft can change, which affects the timing of the spark, but given that kick starting the ttr is often quite hard, the fact you can start it on the kicker suggests the timing is not the problem.

I have a Husky TE610e which would spin over on the starter quite happily but not fire, but when I attached jump leads she'd fire up straight away. Turned out the battery was not up to it - the starter motor was taking so much juice there wasn't enough voltage for the cdi to trigger a spark. The Motobatt now keeps the workshop door from closing in the breeze and a Yuasa starts the Husky! You might find your starter is dragging the battery voltage down too low, but when you kick, there's no drain on the battery so away she goes.

Can't answer for the poor running, but you may have a fouled plug from all the cranking with no spark.

Try jump leads or a new battery.

Good luck.

Well, that took a while to sort out.

Having examined and cleaned all the electrical connections, I took a deep breath and ordered a new Yamaha stator from Fowlers - putting aside the (much cheaper) Chinese one from Amazon. Although the old Motobatt battery was putting out a resting 12.6v, its output was woeful when tested while the starter was pressed. A new battery has solved the issue. Bikes runs better with a quality stator in it too.

I now have a Chinese stator and a Motobatt as door stops.....