Question about 2003 Yamaha YZ 125

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What are the demensions for a 2001 yamaha yz 125 engine magneto/flywheel nut? i need to buy one because i lost mine and dont know what size to get

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Best thing to do is order one through your bike shop. Generally the threads on the crankshaft are of a particular thread size specific to Yamaha, Honda etc. and sourcing a nut from elsewhere is near impossible. They have to be balanced and are sometimes a left turning thread, and generally comform to a specific wall size for best fit on the parts. Trying to to replicate the nut would be a metter of trial and error. They are not that much more expensive than from a hardware store. The link below has the parts available or links to similar sellers. Cheers!

Posted on Sep 29, 2010


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Posted on Jan 02, 2017


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What size nut is on the flywheel of a 2003 V-Star Classic Yamaha I did thread size and all lost nut

Hi, James 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. Good luck and have a wonderful day.

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Where can i find a flywheel for yz 125 yamaha bike

Hi, John for this situation I would check on eBay or 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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Jul 01, 2013 | 2003 Yamaha YZ 125

1 Answer

I have a yz 01 yz 125 and i changed the crank shaft, however i dont know how to reassemble the flywheel and woodruff key... help please..

which part do mean that you cant reassemble? be specific... even the woodruff key is easy to put back.

Aug 24, 2012 | Yamaha YZ 125 Motorcycles

1 Answer

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

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.

Top rating on this solution? Thanks!

May 24, 2009 | 2003 Yamaha YZ 125

1 Answer

Is the flywheel nut reverse thread?

There is a special wrench that will hold the basket while you undo the nut. you should be able to buy this tool at a local dealer pretty cheap.

Mar 28, 2009 | 2003 Yamaha YZ 125

1 Answer

How do i remove the magneto flywheel from a yamaha dt 175 1991 model? tapered or threaded shaft?

You will need a flywheel puller, ( dealer can sell you one > low cost ), and a hammer.
Remove the nut and washer holding the flywheel. Now screw the puller into the flywheel as far as it will easily go. Be sure to back off the pullers' center screw when mounting puller. Tighten the center screw REALLY tight then firmly strike the center of the puller screw with a medium size hammer. Alternate tightening the center screw and striking with the hammer. To tighten the center screw you will want to strike the screw handel with medium hammer force. A few blows with the hammer should pop the flywheel.
Please rate this answer after all is done. Thanks.

Mar 17, 2009 | 2006 Yamaha DT 125 X

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