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Thought I would share my bike rebuild I did on my 2001 CR125. The bike was in a rough shape when I bought it.

Here is the only pictures I have when I bought the bike. I didnt take before pictures. The picture does not do enough justice on how bad this bike was. Sorry about the quality it is the picture the guy send me and he had a filter on it. 

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Got the bike back and started working on it right away. It would start only by bump starting and would not go into the powerband so I started to tear the bike down.(I did a compression test and it was at 60PSI cold) after i pulled the motor I found the cylinder to have a crack in the exhaust side and pits all down the cylinder. It had a Wiesco piston and crank.

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The pits down the cylinder, the walls were scored.

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The steering kept grabbing while turing so I tore apart the steering stem and found the shape of the bearings... Took the dremel and cut out the bearing it would not break loose due to being rusted bad.

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On the frame and swingarm I took the sand paper to and sanded it down from 600 grit to 800,1000,2000,3000 grit. Then on the pipe it is a pro circuit pipe that was black and I took a sandblaster to it then sanded it down. I used a torch on the seams to give it the blue tint.

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Have the bike completly tore down cases were not split this time the crank seemed fine no slop in it move freely figured it would be fine for awhile... front and rear shocks were rebuilt no shock oil was in either front or rear shocks, soaked the chain in gear oil for 2 weeks and let air dry for 2 days, cleaned up the case halves with wd-40 and a scotch brite pad. I wish I would of took before pictures of everything the cases were caked in cow manure and grass took a long time to get the stains out of the cases and swing arms.

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Was time to put the bike all back together piston and cylinder came got a oem cylinder and wiesco piston. I did not put in a new crank more to that later.

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Got the bike back together did not buy any plastics or look good things yet I planned within a month after the build to get all the plastics and graphics. I wanted to focus on all money going in to the bikes motor and more important things. Went to do a break in cycle on the bike ran great had no signs of anything going to fail started first kick, clutch worked great after I used it a bit but then was riding down a gravel road still during the break in cycle and the bike locked up on me that ended the break in cycle. Took it back and started to pull the motor and found that the crank locked up on me. Split the cases pulled the crank and decided to split the crank apart to see out of curiosity what it was and found the big end bearing to be shelled. The marks on the crank were from splitting the crank used a air hammer to split it.

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Ended up going with a OEM Crank and another Wiesco Piston. scored the piston bad with the chunks of the bearing, cylinder was fine no scoring. Big mistake not replacing the Crank after the crank locked up I looked up wiesco cranks and they say they do not last at all. Got new plastics, seat cover and graphics also and finished up the bike project. I spent plenty of time on the bike making it look good and cleaning it up. It was my first bike rebuild I ever have done.

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Edited by Scheer
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