Question about 2001 kawasaki KMX 125

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How much work is there and how much for a bottom end be done ..any one no pls

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The connecting rod bearing is inaccessible without disassembling the crankshaft halves. This is strictly a job for the shop having a two ton hydraulic press. I think you are actually referring to the crankshaft end bearings. Either way, the job doesn't get much bigger >

  • The engine comes out of the frame, the top end comes off.
  • The flywheel and stator come off as does the entire clutch and kick-starter. The shift shaft gets removed as well.
  • The center case gets split then all the gears and shift drum and shift forks come out.
  • Remove the crank and then the bearings and seals.
  • Install new bearings and seals and also a new sprocket shaft left bearing and seal. A new shift shaft seal would be good also.
  • Now take the remaining 100 parts and just put them back the way they were. Experience is desirable at this point.
Don't even think of doing the repair without a factory service manual. You will need a case splitter, impact driver, flywheel puller, gear puller and a torque wrench to do the job properly. Personally I encourage you to do it > but not without a clean work area and bench, the proper tools and a service manual. Check with the dealer as to what they would charge to replace the crank end bearings. Probably $900 to $1100. You can buy the tools and do the job yourself for about $250. Now I want to emphasize that you ARE mechanically inclined, RIGHT?

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.

Click on the following tabs > CLUTCH, CRANKCASE, CRANKSHAFT / PISTON, CYLINDER HEAD / CYLINDER, TRANSMISSION, and also GEAR CHANGE MECHANISM and GEAR CHANGE DRUM/SHIFT FORKS. This will give you an idea of what you are getting into. The best case is you fixed it cheap and now have tools and experience as well. The worst case is you now have tools, a box of parts to take to the dealer and experience.

Best wishes, Tombones49
Can I get a “very helpful” rating on this answer?

Posted on Sep 05, 2009

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Its hard !!!!!!!!

you have to know your stuff ignore that ***** who said a job 4 the shops!

Posted on Nov 26, 2009

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Is a lot mate basically you have to do an engine strip down take gears off clutch etc and crank shaft also if the crank isnt ballanced propally it will seize it but there is 2 the small end bearing or big end bearing the small end is on piston and big end is on crank which one you want changing

Posted on Sep 05, 2009

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Front-end shake above 70 that gets worse.

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Yes and no... The most common problem in the bottom end is with cylinder number 1. It gets oil starved. This is in the 3sgte. Not sure what motor you have. You can change the bearing without taking out the engine....But you will have to drop the sub frame and oil pan. Problem is, is that you dont know if the crank needs reground and or resized. Or if the rod is bad and ovaled. The bearings wont fit.... you can replace the bad bearings.YES! But how long will it last since it wasnt done correctly? Best case. If there is no damage to the crank and rod? Sure it can last a long time with the rite size bearings. But chances are the rod is bad, the crank needs reground/ or its bent it will need machined. good luck

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