Question about Yamaha YZ 125 Motorcycles

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99 yz 125 made a grinding niose now wont start

Was out riding and bike kept going in and out of powerband and then it just went out competely and slowly came to a stop and made a grinding niose and wouldn't start agian no smoke though

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  • 5 Answers

Check your oil for metal particles. Is your oil level correct? You may have ground the innards to death.

Posted on Dec 27, 2013

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Posted on Jan 02, 2017

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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

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SOURCE: 1997 yamah yz 125 lots of white smoke comeing out of pipe

How much was it smoking previously? Too much smoke (oil) is a whole lot better than not enough smoke (oil). If you are mixing the oil and gas then cut back on the mixture. Obviously it is out of balance. Put 1/2 gallon of raw gas in the tank to cut the mix. After a tank or so you should get the balance back.

You need a new shift shaft and probably need a new shift lever due to the bad splines. You can try the JB Weld but I suggest that you go ahead and drill the lever an shaft then put in a cold roll split pin from the hardware store. You have nothing to loose since the shaft and the lever are already toast.

Please rate this solution. Thanks!

Posted on May 01, 2009

  • 1 Answer

SOURCE: bike boggs down no powerband rm 250

i have a 92 rm 250 an i just had it fully rebuilt an it laggs in power band an splutters an feels guttles

Posted on Apr 16, 2011

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My 1989 yz250 wont hit powerband what can I do?


Hi, Jorge for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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I mentioned a while back about how I was out riding my 99 yz 125 and the power was in and out then it made a loud grinding noise and died while I just went and got my bike and took it to my shop and...


Bound up transmission. Bad clutch maybe. After it happened, you most likely pushed it home or back onto your truck or whatever, moving the gears a bit. That would possibly unlock or free up the clutch or tranny. Don't start it again until you tear it apart. You could do more damage if you haven't already.

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99 yz 125 made a grinding niose died now wont start


seized piston, cracked internals no good whatever it is

Dec 27, 2013 | Yamaha YZ 125 Motorcycles

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The powerband on my 2007 yz125 doesnt feel like its running strong at all. the powerband wants to scream but it's like as if it hesitates or kicks on and off. whats going on???


Hi, Andrew 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.
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I ran my 2001 yz 125 out of gas while riding now the bike bogs down and wont idle has low power bottomend and smokes from exaust when it finaly hits powerband please help i tried changing spark plug and...


Hi, Anonymous you may have sucked up all the junk that was in the bottom of the gas tank and it clogged your carburetor which now needs a proper cleaning 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.
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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

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2005 YZ 250 bike has no power in the powerband motor starts


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Look at ?

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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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