Question about Yamaha YZ 125 Motorcycles

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I need instructions on how to change my piston ring on my 1993 yz 125. thank you.

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Download a manual frm iso hunt u need bit torrent app to download but its free and i know manual on iso hunt if u dont find just type in google (yz125 1993 manual torrent) ok bud

Posted on Jul 28, 2010

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1 Answer

2001 yz `125 bogs on hard throttle and blows a lot of smoke


Hi, Anonymous and the usual suspects are:
1. Oil tank/pan overfilled.
2. Restricted oil return line to oil tank/pan.
3. Restricted breather operation.
4. Restricted oil filter.
5. Piston rings badly worn or broken.
6. Valve guides worn and or seals worn, crushed, missing, or have come of guide and are literally pumping oil through the valve guide.
7. O-ring damaged or missing from oil pump at crankcase junction (also results in poor engine performance). 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.
Thread YZ125 Bogging and dying
YZ 125 Bogging out HELP
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 25, 2013 | 2004 Yamaha YZ 125

1 Answer

Alrite ? Iv got a yz 125 2001 it's had new piston


Hi, Dean 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
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
yz 125 tips and tricks YouTube
Yamaha YZ 125 02

May 11, 2012 | 2003 Yamaha YZ 125

1 Answer

When should you replace the piston rings on a yz125


Hi, Anonymous 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.
YZ125 piston life Yamaha 2 Stroke
YZ125 Part 15 2 Stroke Installing Piston Rings Cylinder and Cylinder Head
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 17, 2012 | 2003 Yamaha YZ 125

1 Answer

I have a 2000 yz 125. Melted a hole in the piston but didnt score cylinder. Replaced top end. Wont start. Has good fire. Crank case oil was a little grey. New plug,fluids,fuel.


I would be checking compression it may not be visible score on cylinder but it does not take much to loose compression on small bore motor with one piston ring and 11 years old

Mar 03, 2011 | 2003 Yamaha YZ 125

1 Answer

How do i change me piston and rings on a yz125 2002


If you have never stripped down an engine get expert help .Piston rings are very fragile and can be snapped very easily .They also fit in there correct place on the piston by a small pin in the ring slot and you will neen a piston ring shimming assembly kit to keep the pistons in the correct position while you slide them into the cylinders .

Mar 17, 2010 | 2003 Yamaha YZ 125

1 Answer

YZ 125 Keeps burnig piston & Ring on Exhaust side cant find problem on 4th or 5th piston & ring


only reason would be your running too lean. which causes more heat, which causes pre-gnition and pinging. Also if timing is off you create more pressure which in turn causes more heat

Nov 09, 2009 | 2004 Yamaha YZ 125

1 Answer

How much is my yz 125 worth?


the retail value in good condition is approx $1,500. meaning it looks good, runs good, good tires, breaks,chain and sprokets. but with the extras you have and the after market up grades, i would start with a little higher price.

May 21, 2009 | 2003 Yamaha YZ 125

3 Answers

Loss of compression with dtr 125, kick start


change the rings anyway then you know if its them,cheap and easy to replace

May 14, 2009 | 2003 Yamaha YZ 125

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

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