Question about 2003 Yamaha YZ 125

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How to remove a crank on yz 125 after engine casing is split?

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When you split the case (depending on how you split it) the crank will stay in the left case half or the right case half. Whichever doesn't matter. Just take a rubber mallet and knock it out of the half it is in. Now would be a good time to replace the outer bearing and seal behind the front sprocket. Also replace the shift shaft seal.

By the way, this may be helpful >
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 and/or the notation "Not Available" is in the description, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Could you take a moment and rate my answer? Thanks!

Posted on Sep 23, 2009

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1 Answer

How do you change the crank


Pull the engine out of the frame. Remove the top end. Remove left and right side case covers. Remove the clutch, crank drive gear, shift shaft assembly, kick start assembly, water pump, rotor, stator base assembly, sprocket and miscellaneous other small items. Remove all case screws then split the case halves using a case splitter tool. Be sure to install new crank bearings and seals. You can see an exploded diagram of the engine at the following website.Please rate my answer, thanks.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

Aug 24, 2010 | 2003 Yamaha YZ 125

1 Answer

How do you split a yamaha 125 le engine


start at the top of the motor and remove anny guards and so on then there are 4-6 head bolts remove them then remove the transmission and all that. remove the starter and stator and internal coils then you can split the base

Aug 03, 2010 | 2003 Yamaha YZ 125

2 Answers

On my yz 125 my kick start is jammed


Were you riding it when it jammed because that could mean the that something is sized inside the motor, like the crank or the pistion

Mar 27, 2010 | 2003 Yamaha YZ 125

1 Answer

I need to remove a main drive bearing in the case but can only get to one side of ut


The only way to remove a crankshaft bearing is to split the center case. Don't replace just one bearing, replace both while you are in there. Be sure to install new crank seals as well.

Oct 26, 2009 | 2004 Yamaha YZ 125

1 Answer

Crach in my crank case


if you know how to split your case, take the broken case to an engeneering shop that can can do alloy tig welding and get it welded

May 24, 2009 | 2003 Yamaha YZ 125

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.
www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Top rating on this solution? Thanks!


May 24, 2009 | 2003 Yamaha YZ 125

2 Answers

Crack in my yz 125 2001 crank case


some jb weld shouls work fine on it just get it good and clean no oil or paint on the crack. or find a tig and weld it.

May 10, 2009 | 2003 Yamaha YZ 125

3 Answers

Removing water pump impeller


you might have to split the case to get to the back side of the impeller.

Mar 28, 2009 | 2004 Yamaha YZ 125

1 Answer

Split case on 2001 yz250 f.


miss aline shift drum and also gears are out of whack

best look for another case as complete for they aren't interchangeable the halves

shop manual for your repair or find a used engine/trans ebay

Mar 27, 2009 | 2003 Yamaha YZ 250 F

2 Answers

1996 rm 125 has clutch problems. The quater inch play does not work, new cable, aftermarket clutch with springs,fibers,steele.


Did you check the main crank drive gear i had a 96 rm 125 with that problem. Its a cheap fix if thats the case but the only problem is that the engine needs to removed and the case needs to be be split. If thats not the problem with the case split it should be ovious.

Mar 18, 2009 | 2003 Suzuki RM 125

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