Question about 2003 Yamaha YZ 125

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Should a 2 stroke tick over?

Should my 2 stroke yz 125 tick over or should i have to keep touching the throttle to keep the bike going?

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  • RYANDUNDAS1 May 10, 2009

    is it suposed to tick over though? mines ticks over just now but people say its suposed not to tick over



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You just need to adjust your carb mixture screws located on the side of the carb this will adjust your tickover revs.hope this helps

Posted on May 10, 2009


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I was sold Yamalubeperformance all purpose four stroke SAE 10W-40 for transmission for the yz 125 2006 dirt bike. Would this be the correct stuff

As long as it is case oil and not an automotive oil for a car Because your dirt bike uses a wet clutch and some oills wil clog Up the friction plates

Sep 20, 2013 | 2003 Yamaha YZ 125

1 Answer

I have a 2006 Yz 125 Is the push rod assembly suppose to have free play?

Hi, Cameron your bike is a 2 stroke it does not have push rods for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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.
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
Yamaha YZ 125 02
yz 125 tips and tricks YouTube

Feb 20, 2013 | Yamaha YZ 125 Motorcycles

3 Answers

Im 16, and ive never ridden a 2 stroke in my life and im thinking of getting a yz/sx 125 for trail riding. ive never been able to afford a modern 4 stroke so ive been riding a crf230 and a 1980 tt500 yam....

I would suggest a 250 2-stroke or a 4-stroke. Lots of power, lots of pull and the motor would likely last you for years. I've raced both the 125 and the 250 2-stroke at the pro-am level (A-class) and the difference in engine life is tremendous. I would re-ring a 125 every week (running 26:1), while with a 250 I could go for 2-3 months or more without doing the top end while running 32:1.

A YZ 125 will definately be a bit of maintenance - primarily because it has a single ring and the ring doesn't last long. A pro or semi-pro racer would re-ring every race (when the 2-stroke was popular) - some races I would re-ring in between motos. I know you won't be racing, but I would still imagine you would want to freshen up the top end at least every other month at the most. Granted - you can re-ring a 125 in about 45 minutes for a cost of about $18 if you know how and it costs a LOT more for a 4-stroke and is more of a job.

Other than the ring, the rest of the maintenance will be about the same between a 2-stroke and a 4-stroke. You'll still have to do your air filter every ride and your engine oil (tranny oil in a 2-stroke) every other ride. Tires, spokes, sprockets, clutches, chains, brakes - all pretty equal maintenance between the two. Lots of variables, of course.

The difference will be keeping the motor fresh and for that, the 4-stroke will beat the 125 2-stroke. Not the 250 2-stroke, though - these motors last as long or longer than the 4-stroke and are a LOT cheaper to maintain/rebuild.

This is MY experience and my opinion. Your mileage may vary.


Mar 25, 2011 | 2004 Yamaha YZ 125

1 Answer

What kind of oil do i need to mix in a 2002 yz 125?

You have a 2 stroke dirt bike, off road only, without oil injection. Get a gallon of 2 stroke oil, get the mix from the owners manual or the dealer, should be about 1 pint per tank? Or 4 oz per gallon. It might be more. Don't try to get away with burning motor oil in there, it won't work, it will overheat the engine and could do some damage. Hope this helps.

Apr 03, 2010 | 2003 Yamaha YZ 125

1 Answer

I have a rev and go 2 stroke "pit bike". it needs constant revs and wont tick over. any clues?

Clean the carburetor. The idle circuit is plugged up with trash or varnish or a bit of both. Disassemble the carb and soak the parts in denatured alcohol for 30 minutes. Now finish the cleaning with spray carb cleaner. An air hose also helps. The factory setting on the air screw and throttle screw is one and one half turns outward from a lightly seated position.

Feb 13, 2010 | 2003 Yamaha YZ 125

2 Answers

2003 Yamaha 125 yz plug fouls pretty quickly. running 32/1 fuel oil ratio, and using NKG plug 2411/B8ES. Do we need to run a hotter plug?

NGK BR9EG is the stock plug for your bike. You are one heat range hotter already. I suggest you go to a BR8EG to keep you in the racing plug style but one range hotter than stock. I question what 2 stroke engine oil you are using. Stick with Yamalube 2 stroke oil and you should be okay. If you are using standard motor oil like you have in the gearbox then the fouling is definitely the oil.

Oct 27, 2009 | 2003 Yamaha YZ 125

2 Answers

My 87 yz 125 keeps fouling plugs can anyone help? It runs fine on a four stroke plug but is down on power as you can imagine but will also burn out my piston with long use mates have told me float levels...

Keep the correct plug in it.
If the plug looks black, it's due to too much fuel. You need to go smaller on your jetting. (You need to buy these at a dealer)
Your pilot jet will have a number on it. Get the number off of it and try a smaller step smaller. This effects your jetting from idle to 1/4 throttle.
The needle has a clip on it so you can raise the needle (lower the clip) up or down to effect your jetting 1/4 to 3/4 throttle.
The main jet also has a number on it, and this effects your jetting from 1/2 to full throttle.
Do your jetting by plug color. You don't want white (Lean) or black (Rich) You want chocolate brown.
Keep in mind that crank seals can screw up your mixture, as well as worn out rings, dirty air filter, or poor spark.

Oct 09, 2009 | 2003 Yamaha YZ 125

1 Answer

New piston break-in procedures for a yz 125 2 stroke

let the bike idle for the first min or so then give it a few quick burps on the throttle let it warm right up to operating temp then drive it go through the gears nice and easy first couple times after that you should be able to start opening it up and riding it like you normally would.

Sep 20, 2009 | Yamaha YZ 125 Motorcycles

1 Answer

Yz 125cc 2003

Black spark plug means too rich , you will have to replace the spark plug since it has foul up and reset the air mixture screw on the carburator 2 and 1/2 turns outwards.
Check the air filter too.
Hope this helps.

May 23, 2009 | 2003 Yamaha YZ 125

3 Answers

Oil is a grey colour in the engine of my yz 125 2001

Your bike is water cooled. Some of that water is leaking into the gear box. The cylinder gasket is the likely leak. I would let the shop take a look at it instead of trying to fix it yourself.

But be sure there is not an external source for the water. Do you wash the bike often? Ride the creek bed often? Leave the bike where the lawn sprinkler gets the bike wet? Leave it out in the rain? Change the oil and keep the bike dry. If the problem comes back then go see the dealer.

Mar 19, 2009 | 2003 Yamaha YZ 125

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