Question about 2003 Yamaha YZ 250

1 Answer

Why02 yz 250 won't kick or pop start runs while pulling it but dies as it stop rolling?

Put a new top end and i check if piston was in wrong but was not its geting fuel, and spark, air, compression and it backfires while trying to kick start exshaut pipe is not clog what could be?

Posted by Anonymous on

1 Answer

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  • Yamaha Master
  • 40,632 Answers

Hi, Anonymous you may have a faulty cdi or charging coil issue for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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.
Dirt Rider Magazine
98 YZ250 won run
YAMAHA YZ250 LC Owner Service Manual
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 21, 2016

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Posted on Jan 02, 2017

FoRdMaStEr
  • 51 Answers

SOURCE: 1997 yz 125 wont start, please help

2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.

Posted on Jan 13, 2009

  • 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

bill_48632
  • 149 Answers

SOURCE: exssive oil from tail pipe yz 125

Hi, when you change your pipe to the FMF you reduced the back pressure and gave it more flow. That causes it to run a little "rich". Look at your spark plug and check the color of it, it should be a nice tan color. If its a dark brown then you need to "lean" out your bike. The easiest way to do that is by taking the slide out of the carb and taking out the main jet, the lock washer is set to the middle position for a stock set-up. Move it down 2 notches and then run it and see what your plug looks like. The black "goo" is the unburned oil from not running lean enough. Another trick to try is run a NGK-EV plug. it burns hotter so it will help with the oil problem (and make it a little more snappy also). And as an added bonus it will be easier to start.

Posted on Aug 23, 2009

  • 209 Answers

SOURCE: i have a yamaha yz 250 98' and wont start i

coil

Posted on Apr 07, 2010

  • 5 Answers

SOURCE: 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

Posted on Jun 03, 2010

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2 Answers

My yz 250 will start with a roll start,but I can't


Not sure of the age of your YZ 250 ( You never said!) but in most Yamaha they use dual stage stator which means a stator will charge a spark plug at two speeds one on kick starter speed and the other on running speeds it is common that the low speed circuit on the stator to fail leaving you with a bike that only starts when pushed its a very simple test to diagnose it be worth checking you have spark on kick starter speeds with spark plug out the motor but still connected

Dec 04, 2011 | 2003 Yamaha YZ 250

1 Answer

Parked bike. next day when tried to start ,kick starter locked up ,after talking to a shop i opened up cover on lt side and turned engine over with a socket, but after a few kicks it locks up again .bike...


Most likely, you have a top end failure(piston/cylinder). Once you disassemble the top end, be sure to check for signs of loose or shattered bearings in the bottom end. Often, this can be the actual cause of the top end failure.

*Help me out. Rate me!

Jun 10, 2010 | 2003 Yamaha YZ 250

2 Answers

Bike will roll start only


Check the valve clearances. They may have tightened up after running-in the new work.

Nov 28, 2009 | 2005 Honda CRF 250 X

1 Answer

2005 250 f 65 kicks to start


Several things can cause the problem. First, spring for a new spark plug. The stock plug is NGK CR8E. Now the plug is eliminated as a problem. Next, pull the slide out of the throat of the carb. Now remove the jet needle. Put the needle clip on the 4th notch, (this is the stock setting). Use only premium gas. Next, follow the starting instructions below.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Release the de-compression lever and give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery and clean air filter will also aid in starting.

This will likely tame the beast for you. Please rate this answer. Thanks!

Jun 06, 2009 | 2003 Yamaha YZ 250 F

2 Answers

Trouble starting RM 250


i got a 2000 rm 250 and it used to be a cow to kick over i used to spend at least 20 min kicking to start it until i rebuilt the top end with a new piston and rings now it starts on the fourth or fifth kick if that doesnt help you need a new cpu good luck!!!!

Apr 29, 2009 | 2004 Suzuki RM 125

1 Answer

Bike runs well then dies


i would try cleaning the carb out & flush the tank,then try new gas.that should work.ive never heard of it being eletrical.

Apr 27, 2009 | 2003 Yamaha YZ 250

1 Answer

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!

Mar 23, 2009 | 2003 Yamaha YZ 125

1 Answer

Yz 250 1992 wont kick start


check your compression I had a 94 yz that done that when i checked the compression it was really low so I put new rings on the piston and that's all it took to bring her back to life

Feb 03, 2009 | 2000 Yamaha DT 125 R

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