Question about 2002 Yamaha TT-R 250

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Carb my ttr starts up great then i hit the throttle not even a quarter of the way and it dies.

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Make sure the air filter is clean if it is then take your carb off and clen out your main jet large brass jet in center of the bottom of the carb if that does not fix it adjust your air screw on side of carb brass flat head screw turn right until tight lightly not to hard just enough till it feels snug then start at one turn left and rev 2-3 times then go a 1/4 turn left at a time till the bike revs and runs well good luck

Posted on Jun 28, 2009

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You aren't saying if it is cold or warm. If cold, TTRs are notoriously touchy.
Let it idle on choke for a good three minutes before attempting any throttle. If it stalls, it isn't hot enough.

Posted on Jun 29, 2009


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Sounds like your carb is plugged up with gunk. Will require a good cleaning OFF the engine. This includes running small diameter wire into the ports and bore holes in the carb to dislodge any gunk in them. You can use low pressure air to blow out the channels and hoes, even your breath will be enough, just blow through a straw or tube, or use WD40 with the red tube that comes with it to flush the channels. Make sure you keep track of all parts you remove!! Work on a tray or other containment surface.

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My Yamaha ttr 125 won't start. I cleaned the carb a few days ago and was able to jump start it with my car. I let it run for a while. but now i can't start it again, even when i try to jump it. What's...

I just had a similar issue. Bike would start when cold but once warmed up would die and not restart. My problem was the throttle valve. Check it by removing the black breather pipe at the rear of the carb. Look in the carb and twist the throttle. You should see the throttle valve slide up and down.

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My yamaha ttr 125l wont start it keeps turning over and then dying like it has no gas but it has lots any ideas?

too much fuel will cause same symptoms, grab a can of car throttlebody cleaner from the parts store, and pinch the fuel line off, and attempt to start till fuel is empty in the bowl of the carb, then spray cleaner in carb with the throttle full open 2 to 3 times close throttle, start, as it attempts to run spray slowley while engine runs, adjusting the flow as you rev engine.this eleminates poss bad gas or carb problems. if it runs fine this way then check gas, and check the carb. (while cleaning use a small wire to clean the tubes inside the carb as well, good luck!

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2 Answers

This bike is a 2007 and is extremely cold blooded

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The motorcycle will only start if the choke is all the way on, and it dies if you take it off, it idles fine if it is on, but when you hit the gas the bike dies,unless you hit gas and take choke off at...

a choke is designed to restrict air so that the mixture is rich (more fuel) for warm up. no choke should be used after 5 minutes or so. heres what you need to do. take the carb apart and on the bottom in the bowl of the carb are your jets make sure they are all clean and clear so that all circuits are open (quarter throttle, mid throttle and full throttle.) each jet controls parts of those three ranges. also turn your mixture screw which is usually located right under the motor sie of the carb. turn it all the way in then out 2 turns if you live in high elevation, turn it out only 1 turn and see how it all works. one last thing your problem might be solved by he second option first so try it first.

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Ttr 90 after 1/4 throttle just dies out

Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

If the above does not solve the problem then pull the slide out of the throat of the carb and move the clip on the jet needle one notch lower.

Please rate this solution. Thanks!

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Remove and clean the carbs. Clean the air filter and install new stock plugs. Re-mount the carbs and then balance and sync them. Now would also be a good time for a compression check. Valves and rings do give problems sometimes but these problems show up first as a lack of power. Since you didn't report a power problem I doubt if valves are the problem.

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