Question about 2003 ATK 125 4-stroke

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Started and then died

I have an 125 4-stroke that has been running great. I got on this am and started it up with no issues. Then while the bike was warming up

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The engine quit and the bike will not restart. No lights come on either. I believe I smelled a little burn odor just before the bike died. It was washed and dried yesterday but not started until this morning. Any ideas on what it might be?Sounds like some electrical troubleshooting is in order. Check all the fuses and connections for signs of frying if you smelled burning electrical components. Check your battery voltage and connections. and anything else you can see while poking around. This may involve touching parts of the bike that are not on the handlebars,

Posted on Nov 10, 2008


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1 Answer

I have a 1983 yamaha xt 125 enduro, no battery, electric start, air cooled. bike runs great for about 10 minutes and then just dies, as soon as it cools down it fires right up.and problem starts all over...

sounds to me like the gas cap vent, or tank vent may be clogged. as the fuel level goes down in the tank it needs to vent properly in order to prevent a vaccum in the tank, resulting it to starve for fuel.

Jun 21, 2013 | Motorcycles

1 Answer

Oil from exaust

It's a 2 stroke engine and was a real racing bike when it came out. A little smoke is normal for 2 stroke engines...have fun with that classic!

Jan 12, 2013 | 2009 Cagiva Mito 125

1 Answer

Yamaha tdr 125 1993 starts on choke dies with throttle

Do yourself a favor... take it to a QUALIFIED Professional and get the carb cleaned and set..,

,,. this should fix your scooter...!!

Aug 07, 2017 | Motorcycles

1 Answer

I have an 03 yz 125 and i started it up the other day and gave it alot of throttle and it died out and wont start. and i checked for spark with the spark plug and got none. so what im asking is exactly...

Being a 2 stroke.Put a new spark plug in.It's the easiest and cheapest place to start.2 stroke are good for using plugs
Hope this helps
Even if the plug looks good,it may not be

Mar 27, 2011 | 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

Have a 1992 suzuki 125 rm bike cant get it to

try changing gas . dont forget to empty out carb bowl also check for spark might have a fouled spark plug .

Jan 03, 2010 | Suzuki RM 125 Motorcycles

1 Answer

I have a spark, but i cant start the bike? can anybody help please.

If its a two stroke it could be that there isint enough of a mix in the fuel or if its four stroke it could be compression issues

Sep 18, 2009 | 2002 Husqvarna CR 125

2 Answers

Smoke alot

sounds like the bike is in need of new piston rings especially if that much oil is blowing on such a newer bike. if the crankcase is not overfilled, then focus on rings especially if the sparkplug is oily too.

Feb 03, 2009 | 2004 Suzuki RM 125

1 Answer

Kmx 125 engine knocking

Check the piston to cylinder clearance.You very well could have wore either the piston and/or the cylinder.
Also check the rod for up/down play.Running out of oil could have ruined any bearing in the motor.

Jan 29, 2009 | 2002 kawasaki KMX 125

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