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

rogerm · Newbie

No Spark

TTRfan · Super Guru

I am not very good at this stuff Rogerm as I have a good stock of spares and I just swap parts until the problem is fixed! I was hoping someone more informed on electrickery would be along to advise you cry

If you are confident that your CDi, coil, HT lead, plug cap (known to give problems) and plug (even new ones can be faulty) are OK then you need to go back through each of the connections to the pick up that sits in the generator cover which I am told can be the cause of spark loss. If no bad connections are found and still no spark then maybe a replacement pick up or stator will be needed. Stators can be rewound quite cheaply so don't panic if that is the problem.

Brian

rogerm · Newbie

Thanks TTRFan,

I'm like you in that I'm not real good with electrical problems and generally replace parts until I get the righjt one. I have replaced the CDI, coil, high tension lead and plug cap from a later model TTR230 without luck. I know that these items work OK on the 230 but there is that element of doubt that they may not be compatible with the 250. As for the plug well I have replaced it but there is no spark when I short out the high tension lead using a screw driver to earth.

I guess the stator and pickup are my next options. Any idea how to check those without having to replace them?

Again thanks for your support and thanks for the forum.

Regards

Rogerm

Lin · Senior Member

Check the engine stop switch (red engine cut rocker switch) on the right handle bar. If it has failed in open circuit she won't start. Remove the seat and tank, there is a four wire connector above the cyl head in the wiring harness. Wire colours on the switch side are red/white strip, red/white stripe, blue/white stripe and black. Disconnect the connector, with the switch in the ON position use a continuity meter (or a powered test light) and see if there is a circuit across the two red/white strip wires. You also maybe able to access the internal circuit of the switch by removing it from the handlebar, I don't know.

If this is ok check the pick-up coil. There is a two wire connector a little further back from the engine cut connector. The wire colours on the coil side are white/red stripe and white/blue stripe. Disconnect the connector and use an ohmmeter across these two wires. Should see 190~230 ohms. If low/no ohms or infinite ohms the coil is dud.

I hope it's the switch.

rogerm · Newbie

Thanks for the help everyone.

I had to take it to the local Yamaha dealer and they told me that it was the stator and that makes sense cause it was the only thing I did'nt swap with my sons' bike and the only thing I didnt know how to test.

I will ask the mechanic how he diagnosed it for future reference.

Again thanks for your help...

Regards

Rogerm

TTRfan · Super Guru

Glad you got to the root of the problem Rogerm. Hopefully they can get the stator rewound as that is the most cost effective repair.

Brian

Dullthud · Veteran Member

For the sake of completeness, was it the windings or the little pick-up thing for the CDI?
It would be good to know of a test for that particular failure for future reference.

Andy

rogerm · Newbie

I dont exactly know if it was the pickup or the windings. I asked the mechanic nad he said the stator came as a kit so thats what I got. I did'nt know you could rewind the stator!

I still dont know how to test the stator, I was going to ask the mechanic this arvo when I picked it up but had already knocked off.

Again thanks everyone for your help and support, I'm going to go through the rest of the thread and look at various performance improvements I can do to get the old girl going a bit better......

Regards

Rogerm

Aidan · Senior Member

My 2000 ttr250 had the exact same problem and turned out to be the stator switch, not the actual coil. ( the magnetic switch telling ur engine when to spark). You can test the entire stator System with a standard multi tester. Just follow the book for the correct specs. But as mentioned above you have to change the entire coil as it comes all together. Which was not cheep. But I found a website from America that was almost half the price of here I'n australia.