Question about 2000 Yamaha DT 125 R

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I have a dt 125 field bike will not kick start

I have a dt 125 field bike i have had the main bearings and seals done new top end carb is set up to manual new plug blue spark still will not kick start i am stuck please help thanks

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  • Anonymous Oct 11, 2009

    inlet manifold is sealed up perfect it nearly starts just will not start

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Try squirting some fuel on the inlet and see if it firse get back to me with results

Posted on Oct 11, 2009

Testimonial: "will give it a go tried for hour today "

  • ollie reece-jones
    ollie reece-jones Oct 11, 2009

    ok buddy if yuo try that and it fires for a second we then know its the fuel side of things

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1 Answer

Ok, i recently purchased a DTR 125 R 2000 model with running problems The bike will start with the choke on, then die with the choke off, the fuel/air mixture screw was mashed up so i purchased another...


Sounds like a vacuum leak is leaning out the mixture....check the intake between carb and engine for leaks...another source may be tjhe crankcase seals are leaking.

Mar 31, 2011 | 2000 Yamaha DT 125 R

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Hello ive recantly replaced my pistons and rings on my dt 125. i have been told it was the pistons that was stopping my bike from running, but now that i have changed them my bike will still not start. can...


The first thing to do is get a new stock spark plug. Hook up the plug wire then have someone kick the lever while you hold the metal side of the plug against the bare metal cylinder head looking for spark while the starter is being kicked. If no spark is seen, find out why. Use a meter to check the handlebar and side stand switches for proper operation. How good is the battery? Are there any wires abraded or disconnected? Has the pulse generator, coil or CDI gone bad?
If spark is present, Be sure the air cleaner is clean. A dirty filter restricts the air the carb needs. Okay, you have spark and you have air, now you need gas. Start by draining the carb. Condensation from the gas tank can get into the carb float bowl and build to the point the carb is feeding only water into the engine. Engines don't run well on water. When starting the bike, do not go nuts with the throttle. Every twist on the throttle sends a shot of gas into the engine. Too many twists can flood the engine. Your bike is water cooled. Good gaskets/seals are needed on the cylinder and head. At this point we will assume the coolant system is not leaking.

Mar 22, 2011 | 2003 Yamaha DT 125 R

1 Answer

Yzr 125 when trying to kick over the bike, no compression at all. already did full top end


Not to be the devils advocate but if there is absolutely no compression while using a compression tester, you may want to check the top end was correctly installed. Even then, you should have some compression. Your only real other issue would be lower main seals. these are the seals thatseal the crank to the case. if they are bad, you will see oil protrude through them when you remove the side covers and turn over the engine. And again, if the top was done correctly or evan has a piston and rings it will still read something. if your merelyh going by feel of kick, be sure to get a compression tester at yout local autozone

Dec 14, 2010 | 2004 Yamaha YZ 125

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Yz 125 2001. starting ploblem after top end rebuild


Kinda sounds like your needle valve is sticking in your carb and it is giving it to much fuel

Jun 03, 2010 | 2003 Yamaha YZ 125

1 Answer

2001 kx 85 has sever low end hesitation. I can't tune it to save my live. won,t idle properly. when at idle if you crack the throttle it will bog and then rev up


Hello you have a
1. fuel starvation problem clogged carburetor jets.(clean the carb)
2. Intake leak carb joint/intake manifold.( start your motor get it to idle best you can spray wd40 around the carb joint if the rpms change you have a leak replace the carb joint or gasket/o-ring as needed.
3. crankshaft main seal magneto side leaking or worn main bearing.
check end play on the magneto side remove the cover plate firmly grab the end of the shaft with up an down motion if you can feel it move replace the main bearings and seals.
These are problem that will cause your motor to run lean and hesitate.
Hope this helps you with your problem

May 10, 2010 | 2003 kawasaki KX 125

1 Answer

Problem with autolube pipe 1999 yamaha dt 125 air cooled


it will rev cause it is sucking air where the oil pipe used to be. the tube will be close to the rubber intake, if not on the intake itself

Feb 12, 2010 | 2000 Yamaha DT 125 R

2 Answers

Dosent start


sounds like crankcase seals may be bad

Apr 07, 2009 | 2001 Yamaha V Star 1100 Classic

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2003 Suzuki RM 125 with no power band.


Scatter gun approach > thoughts to check out > > >
Clean and dry the air filter? Go back to a stock main jet, at least to check things out? Are "O" ring seals on the main jet going bad?Partial internal collapse in exhaust (remove exhaust pipe & do a quick run down the alley), Install a new stock NGK spark plug, Be sure battery connections are clean and tight, Be sure intake manifold and carb are good and tight.

Hope this helps!

Apr 03, 2009 | 2003 Suzuki RM 125

1 Answer

Dt 125lc 1987 back misfires and does not pick up on acceleration


I am going to have you do a series of things to clear up the problem. First come the basics >

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. 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 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. Don't be cheap, use a lot of cleaner. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean and dry the air filter and install the carb. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road unless other problems exist.
Let's say that the bike is no better >
  • How good is your battery?
  • Carb, head, intake manifold and carb mounted tight?
  • Does the carb intake manifold have reeds? What condition are they in?
  • Remove the flywheel cover. Take hold of the flywheel and, without turning the wheel, lift the flywheel up and down then left and right. Any movement or was the flywheel rock solid? If movement then the crank bearings need replaced along with the crank seals.
  • Speaking of crank seals, how old are your seals? The bike ain't gonna run with bad seals.
  • I don't recall for sure, does the bike have CDI? If so, have the dealer test the CDI and the coil.
  • If no CDI, when was the last time the points and condenser were replaced or points filed and set? Get the coil checked.
  • How old are the piston and rings? You could have problems there. What shape is the cylinder wall in? Scared up, low spots (you will not see the low spots without running a cylinder hone through the bore).

There isn't much more to do. You just rebuilt the engine.
Please rate this solution. Thanks!

Apr 02, 2009 | 2004 Yamaha DT 125 R

1 Answer

Kawasaki ke 125 runs for about 2 minutes stalls then when kicked over will idle sometimes but not take throttle left for a while will run again for 2 mins


Go to the dealer and ask for the stock plug for your bike. Check for spark on the new plug then install the plug.

Remove the carb , dissemble it and clean the varnish out. Remove the petcock, ( gas valve ),water trap and clean it out. Next let one cup of gas flow into a container. Any water or rust in the bottom of the container? If any rust was in the water trap or the container then purchase an inline fuel filter to eliminate the rust getting into the carb.

If cleaning the carb yourself does not do the trick then take it to the dealer and have them clean it and install a car kit. This should eliminate the carb as a problem. Get a new air filter and install it.

Now you have spark, gas and air. If it still will not start it is likely that you need new crank seals. On a bike that old you may well need new crank bearings as well.

Please rate this solution. Thanks!

Mar 21, 2009 | 1978 kawasaki KE 125

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