Question about 2003 Yamaha YZ 125

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How do I take off the Magneto off a 2003 Yamaha 125

I need to replace the piston rod bearing and the rings and I need to split the motor and I dont know how to take off the magneto

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If replacing the piston pin bearing no splitting is needed. If replacing the crank pin bearing splitting is needed. You knew that I am sure but I had to clarify. The flywheel is held in place with one washer and a nut on the end of the crank. Timing is accomplished with a woodruff key on the shaft. Using a flywheel puller tool is the proper method. It is a simple and low cost tool and it sounds like you have enough knowledge of engines to need one now and in the future. In a worst case scenario, use a mallet, striking the flywheel on four points around the perimeter of the wheel and in an "outward" direction. With some luck the flywheel will pop loose.

When you are purchasing the flywheel puller, buy a case splitter also. Also reasonably low cost, it makes the splitting clean and easy. I strongly suggest you install new crank bearings and seals. Whatever caused the crank pin bearing to go bad did not do the crank main bearings any good either. I would hate to see you have to split the case again eight weeks from now.

How are you planning to separate the crank halves, re-assembly and truing of the crank? The dealer should do this part. I can't find a free repair manual on the web but the next best is a parts diagram. Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.
www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Top rating on this solution? Thanks!


Posted on May 24, 2009

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Related Questions:

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 2003 Yamaha ttr125er. The connecting rod bearing was seized up on the crank. I am wondering if I will be able to disassemble the crank and put a new pin and bearing in and reassemble the crank...


Allan this is a shop job for the connecting rod. You should be able to do the rest yourself if your mechanic abillities are good. If you got the engine hot enough to seize it you might have more problems instore for you. Are you sure it is a con rod and not piston in cylinder seized? If it is a con rod bearing see what a shop would charge, then see what is available on ebay for parts. I have seen them (crank and connecting rod) on ebay between $50.00 and $180.00.

Apr 19, 2011 | 2002 Yamaha TT-R 125 L

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

My yamaha 125z was in a bad condition...the engine making a weird noise...


sounds like it needs a top end job,check the compression with a compresion tester ( auto zone $30.00) could be rod bearing or piston bearing going bad( they get slack and start slaping around inside the engine) i would not ride untill you fix if the rod comes apart it will ruin alot of parts.

Jun 09, 2010 | 2003 Yamaha YZ 125

1 Answer

How too replace connecting rod on a ttr 125l. I have a 2001 ttr 125 with a seized conn big bearing. and I would like to know the proper way of splitting the crank too replace it


The top end comes off then the left and right side covers, flywheel, clutch and shift shaft. Now a case splitter is used to split the center case halves. To replace the bearing you will need a hydraulic press to disassemble and reassemble the crank halves. If the bearing is seized you should replace the bearing, crank pin and the connecting rod. The crank must be realigned using twin dial gages. Personally, I suggest a new crank assembly be purchased from www.babbittsonline.com ( $241 ). I would replace the crank end bearings at the same time and also the sprocket shaft outer bearing and seal. Please rate my answer.

Jan 03, 2010 | 2002 Yamaha TT-R 125 L

2 Answers

Cam timing my 2003 yamaha yz450 how do i do it


take magneto cover off find tdc on the magneto and look at the cams it should be after the inlet valve shuts and goes on the firing stroke just put a rod in the cylinder and see if the piston reaches the top off the bore when the magneto is at tdc then its fine buddy any probz im here to answer

Oct 08, 2009 | 2003 Yamaha YZ 450 F

3 Answers

I asked a question yesterday about my 125 seizing up; well today i tore apart the top end and all looks good ,can't find anything wrong no metal shavings or scaring in the barrel, any advice? The motor...


With the cylinder still off, your connecting rod should move left to right a little, but not up and down. Be careful doing this to hold the crank to check for rod bearing wear. Also, see how the crank turns, the two main bearings for the crank need to be smooth to the feel.

Sep 01, 2009 | 2003 Yamaha YZ 125

1 Answer

Need to replace lower connecting rod bearing, possible crankshaft! is this difficult


To replace just the lower connecting rod bearing is difficult. It needs to be pressed, and then trued to specs. If this is not done correctly, your crank will destroy itself very quickly. Buy a crank, and replace the bearings and seals on the left and right of it.

Aug 07, 2009 | 2003 Yamaha YZ 125

2 Answers

SEIZED PISTON


excessive piston clearance.really needed bore job with oversized piston,not just honed and rings.measure piston to cylinder clearance,check spcifications and verify

Apr 05, 2009 | 2003 Yamaha YZ 125

1 Answer

Engine locked up


no use changhing the piston / rings / sleeve .,you need to split the engine and replace the crankshaft and con rod bearings.although renew the piston kit complete..

Jan 24, 2009 | 2004 Suzuki VL 125 Intruder LC

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