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Post Info TOPIC: ttr250 wont run
Jl


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ttr250 wont run
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hello everyone bran new to this> i just got a 02 ttr 250. had for 6 months. amazing bike love it! just started to have problems 2 months ago. it starts fine runs for about ten minutes then bogs out, and then just dies. i have done some research and found that it could be a few things. did all the cheapest stuff furst. cleaned filter, changed plug cleaned carb throughly. and nothing. was told to check stator and pick up coil. i did its read didnt match so i replaced it. now still the same darn thing. im puzzled any ideas? any body? any ides would be greatly appreciated. oh and some one mentioned the cdi? how can i test this? thank you!



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Have u checked the piston?? If it only is only after it warms up it could possibly be oil ( that is now warm) getting into the combustion chamber. Through the rings Or valves. You will notice smoke out the back of the exhaust. But usaly it still runs slightly. Other option is the choke/ cold start is staying open causing the engine to flood with petrol And bogging it out as it warms up.

I'm not sure how to check your cdi, Brian might. But all the wiring diagrams are in the back of the service book on this website somewhere.

Just my 2 cents
Id check the carb first as its much eaisier the play with then getting to the piston( once again u should see smoke if it is the piston)

Good luck!

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Lin


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There is a 10k ohm suppression resistor inside the connector that joins the HT lead to the sparkplug (sparkplug cap) If this resistor fails the symptoms can be similar to a faulty ignition coil (stopping after 5~10min operation) Remove the cap from the plug. Unscrew the brass ferrule inside with a flatblade screwdriver. Be careful there's a little carbon resistor and a spring that falls out. If you have an ohmmeter measure the resistance. We had one fail and replaced it with a short length of steel (piece of a 4" nail actually) and away the bike went again. It probably played havoc with every TV it went past.

Having checked that out, try a another ignition coil. Ignition coils sometimes work when cold but break down and fail when warmed up. Failing that, try another cdi unit. Yamaha don't publish a cdi test as far as I know.

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Welcome, Jl, to the TTR forum.

I presume you have checked the breather in the filler cap.  confuse

This sounds a classic example of fuel starvation that hapens when the carburettor is starved because air can't get into the petrol tank.

Check the one way valve in the filler cap tube and the tube itself.  wink

Martyn



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Lin wrote:

There is a 10k ohm suppression resistor inside the connector that joins the HT lead to the sparkplug (sparkplug cap) If this resistor fails the symptoms can be similar to a faulty ignition coil (stopping after 5~10min operation) Remove the cap from the plug. Unscrew the brass ferrule inside with a flatblade screwdriver. Be careful there's a little carbon resistor and a spring that falls out. If you have an ohmmeter measure the resistance. We had one fail and replaced it with a short length of steel (piece of a 4" nail actually) and away the bike went again. It probably played havoc with every TV it went past.

Having checked that out, try a another ignition coil. Ignition coils sometimes work when cold but break down and fail when warmed up. Failing that, try another cdi unit. Yamaha don't publish a cdi test as far as I know.


Excellent information Lin!  I was in touch with an owner from India who had replaced CDi, carb, etc and was still having starting problems. Turned out to be this resistor causing the problem.

Brian



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Lin


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TTRfan wrote:
Lin wrote:

There is a 10k ohm suppression resistor inside the connector that joins the HT lead to the sparkplug (sparkplug cap) If this resistor fails the symptoms can be similar to a faulty ignition coil (stopping after 5~10min operation) Remove the cap from the plug. Unscrew the brass ferrule inside with a flatblade screwdriver. Be careful there's a little carbon resistor and a spring that falls out. If you have an ohmmeter measure the resistance. We had one fail and replaced it with a short length of steel (piece of a 4" nail actually) and away the bike went again. It probably played havoc with every TV it went past.

Having checked that out, try a another ignition coil. Ignition coils sometimes work when cold but break down and fail when warmed up. Failing that, try another cdi unit. Yamaha don't publish a cdi test as far as I know.


Excellent information Lin!  I was in touch with an owner from India who had replaced CDi, carb, etc and was still having starting problems. Turned out to be this resistor causing the problem.

Brian


 Yes, they can be a tricky little thing....  I've come across two failed resistors - when they fail they adopt a curious grey colour and appear porous.  



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Jl


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ok guys i will check everything mentioned. thank you everyone for your ideas. it is greatly appreciated. i will get back to u guys.



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