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My son laid down his ttr 125 pritty hard we picked it up and it started up eazy but when we turned it off and tryed to start it again it has no compression does it have a compression release I can't find one

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  • Motorcycles Master
  • 15,557 Answers

Valve is stuck or not seating. Listen when you crank it and see if you hear air moving out of the intake and exhaust. The exhaust is a little tricky because it should let air out just not during compression. There is no unloader.

Posted on Apr 24, 2013

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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: while riding my yz 125 it just died and won,t kick up again

  • If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
  • If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
  • While at the parts counter, get a new stock spark plug and a supply of Yamalube Two Stroke Motor Oil. You need to add 4 ounces per gallon when filling up. This will be a 32/1 gas to oil ratio. NEVER ride the bike without at least the needed 32/1 mix.
Please rate the solution as a "FixYa" if able. Thanks!

Posted on Mar 23, 2009

  • 3567 Answers

SOURCE: Starting Problems Yamaha TTR 125

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 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 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 the air filter and install the carb. Be sure the bolts are tight. 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.


Please rate this solution. Thanks!

Posted on Apr 05, 2009

  • 13 Answers

SOURCE: Loss of compression with dtr 125, kick start

change the rings anyway then you know if its them,cheap and easy to replace

Posted on May 14, 2009

  • 850 Answers

SOURCE: 2007 yamaha ttr 125 wont go into gear. starts

gear selector may be jammed inside the casing or broken
check that the shifter is tight on the shaft!
check clutch adjustment
try rocking bike back n forth without using clutch while you try ******* the gear lever it may come unstuck
but get it looked at if it frees up!

Posted on Jul 20, 2009

  • 1 Answer

SOURCE: Yamaha TTR 125 L won't idle

The problem is that your idle is adjusted to low just like mine, you need to adjust your idle

Posted on Aug 04, 2009

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2 Answers

TT-R 125 LE no spark


Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and CDI box.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose, check for spark leakage in the dark.
6. Faulty ignition coil, pick up coil, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
06 ttr 125 challenging electrical problem TTR
Dirt Rider Magazine
YAMAHA TT R125 Owner Service Manual
OEM parts for Yamaha
YAMAHA TT R125 Owner Service Manual

Feb 16, 2014 | 2003 Yamaha TT-R 125 LE

1 Answer

My Yamaha ttr 125 isn't wanting to start. Its not getting spark or wanting to turn over


hav u seen spark--tested for it or felt it--go over wiring again and chec for corrosion or bad ground----is fuel delivery ok-smel or see gas--compression may be weak---------try pushin it in a high gear like 3 etc--

Dec 21, 2012 | Motorcycles

1 Answer

2002 yamaha ttr 225 idles high when let off gas but eventually idles down on its own and hard to start when cold with choke or without


Hi, David and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
10. Multi carburetors not in sync.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links blue below. Good luck and have a wonderful day.
TTR 225 Carb Problems
TTR 125 Idle Issues
http://tjsconcepts.com/ttr225/TTR225_Service_Manual.pdf
OEM parts for Yamaha
http://tjsconcepts.com/ttr225/TTR225_Owner_Manual.pdf

Jun 21, 2011 | 2002 Yamaha TT-R 225

1 Answer

07 ttr 125 cranks but will not start right up when it does it will not take gas it dies and you have to turn key off and back on before it will start back it will idle for a few seconds and die again over...


I have two ttr 125's and my son has another, all 05's but i ran into this with a friends 02 as well. All ttr 125's are cold blooded bikes to say the least. the cold starting procedure that works is to first lean the bike over to the left till it dribbles a little gas on the floor. hit the electric start for a few seconds only, wait 20 to 30 seconds and do it again. holding the starter button down and cranking will do nothing but flood the bike out. short busts only, dont give it any gas ever, this will also do nothing. first it will start for a brief moment then die, hit the button for about 3 to 4 revelutions and wait, the next time it will start again, most likely only for a few seconds again, repeat this and each time it will run a little longer till it keeps running on it own. the best way to get your ttr to start easier is to cut the top of the airbox off, this will give the bike more power (youll see why when you look at the tiny opening) and allow you to spray starting fluid under the back of the seat right into the airbox. it makes starting a cold bike 5 times faster. usually only 2 repeats of the starting procedure.

Feb 22, 2011 | 2002 Yamaha TT-R 125 L

1 Answer

Okay so I have a 2003 Yamaha TTR-125 dirtbike, it is NOT electric start, it is kick-start. All of the plastics were replaced so I do not have the original stickers on it with the model, therefore I forgot...


There is a frame number stamped on the frame neck. If you call a dealer they can look up the year and model using an ID microfiche. Next to the stamped frame number there should be a riveted plate with the VIN number on it . If this plate is still on your frame it also has the model number and the model year of the motorcycle clearly printed on it. All Yamaha dealers have the ability to ID your machine using the Vehicle Identification Number.

Dec 30, 2010 | 2003 Yamaha TT-R 125 LE

1 Answer

Take to long to start.. takes almost ten minutes of kick starting... electric starter wont turn over to start bike yamaha ttr 125


The TTR-125 Carburetor's Run Lean by design. Mine had the same issues till I found a post on Thumpertalk.com on Carb and air box Mod. This is a good starting point on gets; 110 and 112.5 main and 17.5 pilot. But you must check spark plug coloring to make sure the jetting is correct. Check spark plug after the bike has been ridden for a wile. I also took out the stock baffle and replaced it with exhaust tip and now it fires up after a few kicks and worms up in a few minutes.

Dec 15, 2010 | 2005 Yamaha TT-R 125 L

1 Answer

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.

May 19, 2010 | 2003 Yamaha TT-R 125

1 Answer

Ttr 125 had bad tire


check the tyre for a nail or whatever punctured the first tube, when you remove the tube keep it in the same position as it was when it was in the tyre, blow it up and check the hole then check the corresponding place in the tyre for the nail

If the new hole is a small split you may have damaged it during fitting


be careful not to pinch the new tube when fitting

Apr 08, 2009 | 2003 Yamaha XVS 125 Dragster

1 Answer

Hard starting of a yamaha ttr 225 after sitting for several weeks. Could starter plunger in the carb be bad?


I had a similar problem with my TTR 125. I removed the carb, removed the float bowl and gave a a careful clean. I also removed the choke plunger mechanism and gave that a few shots of penetrating lube oil. The choke mechanism works much smoother as a result.
Just those two simple things and my bike fired up right away.

Mar 09, 2009 | 2005 Yamaha TT-R 125 L

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