Question about 2003 Yamaha YZ 125

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I need directions on how to install a top end kit on a yz 85

I bought a 2002 yz 85 from some kid and the bike came with a top end kit. im looking to rebuild it but i dont have the damn directions for it and i dont wana screw something up but one thing that i was wondering is will i beable to do it with out purchasing a 40 dollar manual?

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Top ends are easy and you can do it without the manual. however i strongly recommend that you get a manual so you have ALL the correct torque specs and procedure for doing the job right the first time. the service manual has all the info for every aspect your bikes service needs.

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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1 Answer

When to change piston rings in a yz 85


Hi, Maddisoncame replace your piston rings when they are worn past service limits 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 zero $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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I have a 2002 YZ250F that probably needs a new top end? What is an approximate cost on repairs?


Hi mate if you can rebuild your self then parts would be about $200 for piston kit and about $80 for the gasket kit and to be extra nice to the bike then about $10 new oil and same again for new oil filter so parts only well under $400 with some change
you may want to consider new cam chain whilst you have it all apart unless it has been changed as over 8 years old would mean it is well an truely used to its potential if you include the cam chain then you won't get any change from $400 but this figure would be pretty close give or take $50
As for paying someone to rebuild it for you well sorry to say you well on the way to $900 in the shop for labour and parts but if you need this option shop around to find best value
My Moto X parts online store can help you with best value for the parts delivered to your door this could save you few dollars if you rebuild yourself or supply your own parts to the mechanic to rebuild?

May 20, 2011 | 2003 Yamaha YZ 250 F

1 Answer

What color piston does a stock 2004 yz 125 come with?? Im rebuilding my top end but theres different color oem pistons? whats the difference???


Hi, Mezacarlos 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.
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Dec 18, 2010 | 2004 Yamaha YZ 125

1 Answer

Yz 125 2001. starting ploblem after top end rebuild


Kinda sounds like your needle valve is sticking in your carb and it is giving it to much fuel

Jun 03, 2010 | 2003 Yamaha YZ 125

1 Answer

How do I remove the piston from my 2003 YZ 125?


Hi, Jakephair 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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May 19, 2010 | 2003 Yamaha YZ 125

1 Answer

Looking for torque specs. on yz125 yamaha 2004 top end rebuild


Hi, Spotteddog3 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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May 14, 2010 | 2003 Yamaha YZ 125

3 Answers

Just bought a used bike not sure if it is a yz80 or a yz85 does anyone know how i can tell


look on the engine, there will be marking on it for the 'cc' if a yz80 it will prob be '79cc' and if yz85 it will prob be '84cc'

Mar 22, 2010 | 2003 Yamaha YZ 125

2 Answers

No problem just done top end rebuild


Just ride it normally. Avoid super high revs when the bike is not in gear and using the power.

Please rate this solution. Thanks bookerm!

Apr 02, 2009 | 2003 Yamaha YZ 125

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