Question about Yamaha YZ 125 Motorcycles

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I have a 1993 yz 125 took off acrossed a field went through all the gears 2 times then all of a sudden i lost the power band competely?

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  • Yamaha Master
  • 40,650 Answers

Hi, Kstatzer and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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.
01 YZ 125 no power band please help Yamaha 2 Stroke
Dirt Rider Magazine
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 18, 2016

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

tellme2
  • 137 Answers

SOURCE: '95 Yamaha YZ 125 clutch - stays in gear when clutch is pulled in

hey dude,, just thought id come in and give u some tips or 3,, i take it when u pull clutch lever in, and try and change gear it feels like your foot will snap b4 it goes in gear,, if that makes sense,, firstly mate,is to make sure the clutch cable slides freely ,easest way is to take cable off and just grab 1 end and make sure it isnt sticky,, if so dip one end of the cable in a bit of old oil ,,whilst holdin the other end ,pull and push the cable inner, this will **** up a bit of lubricant inside the cable ,, keep doin this each end till free to move, ,,next step if the cables ok,,, and may need help if u dont no,drain the oil out,,and as u r sat on the bike is to remove the clutch casing on the right hand side of the moter,where the bottom end of the cable goes,remove the casing being carefull not damage the gasket,,then u will see clutch plates and friction plates housed,, undo the 7 or 8 spring loaded bolts carefully take the first fibre plate out then metal friction plate then another fibre plate and so on,, wen u take the 1st plate out place that on the bench ,stacking each plate on top of one another, cause they have to go back in as they came out,,wen out,,u need a piece of wet n dry paper ,or fine emery,,and just wipe round both sides of the fibre plates taking the shine off them,as u put them back in,, put casing back on with a decent gasket,, oil back in cable on, make sure cable has no free play on the lever so wen u r about to pull lever in it bite straight away,, start her up, warm it up and try it,,any probs still il eat my shoe,, take care m8

Posted on Jan 10, 2009

  • 3567 Answers

SOURCE: 1987 yz 125 rebuild

40 foot pounds.

Posted on Mar 13, 2009

  • 3567 Answers

SOURCE: what oil should i have in yz 125 2 stroke

The clutch and gearbox share the same oil. The oil for the motor is 10w40. Stick with the major brands; Pennzoil, Quaker State, Mobil, Yamalube or Shell.

Posted on Apr 19, 2009

  • 3567 Answers

SOURCE: I have a 95 yz 125 head and 98 yz 125 bottom end.

You have a 50/50 chance that they will work okay. All the mounting holes need to line up and the cooling holes as well. Get a head gasket for the '98 and see if all lines up. Will the exhaust pipe fit the '95?

Posted on Apr 30, 2009

firenut119
  • 66 Answers

SOURCE: oil

on a ratio-rite there are hash marks for cc. a cc is the same as a milimeter

.65 liters = 650cc

Posted on May 03, 2009

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1 Answer

My yz 125 started to bogg down when i put my bike in 3rd gear and i drove it back the next day i went to wash it and i tried to start it. it started but bogged right down till it shut off no matter where...


Ii sounds like your bike cuts out when it get`s hot ? If it does this like clockwork then i guess you have same problem as me with my no limit 125 which does exactly that. i have fixed all connectors & cdi but it still does it. Which leads me to believe some ferrite core in the ignition system is going non-magnetic (called the Currie temp) at this "hot" temperature. It can either be the magnets in the flywheel or the core of ignition coil.I only use this bike for trips less than 10km so i live with it. if anybody can shed more lite plz!

Aug 05, 2013 | 2005 Yamaha yZ 125

1 Answer

My yz 125 dirtbike is stuck in 1st gear while its off and wont start up


try to compleatly shift down then half up with the clucth in

Sep 14, 2012 | 2003 Yamaha YZ 125

1 Answer

Yz 125 slow going into powerband


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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
1999 yz250 not hitting power band
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Apr 10, 2012 | 2007 Yamaha yZ 125

1 Answer

I have a 2004 yz125 it has good power on the bottom end but 4@5 gear it falls on its face like the power band is not coming in


You most likely blew it up.. you could have a leaking head gasket but its most likely your piston and rings

Feb 18, 2012 | 2004 Yamaha YZ 125

1 Answer

I have an 04 yz 125 that won't shift into 2nd but


2nd gear is at the bottom of the shafts if the tranny is stacked in the mag side case. So it is controlled by the bottom fork. You should be able to shift it thru all the gears by turning the shift drum. Make sure as you shift the shafts stay all the way in the output shaft and idler shaft bearings. As you shift it, look for full mesh between the wheels(shaft that goes to the clutch) and the gears across on the output shaft.
If that all looks good, the shifter cluster(on the end of the shift drum, with the 2 dogs that engage the notched wheel on the end of the drum) may not be lined up properly. If the gears and shift drum are new, I'm thinking I'd look there first. Good luck!

Jun 11, 2011 | 2004 Yamaha YZ 125

1 Answer

Got a 2002 yz 125 seems like power band doesnt kick like it lost the "bing bing its firing has a new plug new ring good compression power valves in jug are clean and carb is clean not too sure on...


Hi, Mshurley3h 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.
Power Valves
Yamaha YZ125 Power Valve Repair Fix with Roll Pin
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 23, 2011 | 2004 Yamaha YZ 125

1 Answer

Have a yz 125 2001 need help with pilot screw?


125 bottom end power is almost non existent, but u could look on yds possibly for jetting and carb tuning specs, it all depends on altitude and temperature.

Apr 08, 2010 | 2003 Yamaha YZ 125

1 Answer

Have a yz 125 2001 help coughs and sputters


Sounds like your carb is partially stopped up causing it to starve for fuel. I would suggest adding a good carb cleaner to the tank but sounds like it needs to be pulled and cleaned.

Ride Safely, Ed

Apr 08, 2010 | 2003 Yamaha YZ 125

1 Answer

What oil for yz 125?


I would use maxima mt 75w gear oil in all 2-stroke trans.

May 01, 2009 | 2003 Yamaha YZ 125

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