Skip to playerSkip to main content
2026 YZ125 Top End Rebuild #dirtbike #yz125 #topend #rebuild #2stroke

Category

📺
TV
Transcript
00:00I just blew up my bike and it's time to put a new piston in it.
00:03Oh, not good.
00:04I'm going to get started by removing the power valve cover and this little linkage thingy.
00:09Now I'm going to loosen off all the cylinder head nuts.
00:11Now I can pull the cylinder head off and check for damage.
00:14It looks alright to me, I can't see any obvious damage, but I'll take it in for a second opinion
00:17anyway.
00:18Let's give the piston a little blanky, keep him warm.
00:20Now that he's nice and cozy, we can remove the C-clip and the wrist pin.
00:24Goodbye, Mr. Piston.
00:25I'm also going to remove the small end bearings and putting a new one in anyway.
00:28Just in case metal got into the crank, I'm going to flush it out real quick.
00:31Oh my.
00:33Yeah, so that's what the piston should look like.
00:35Time to lube her up and slap a new small end bearing in there.
00:37Alright, time to slap the piston on there, put the new wrist pin in, make sure everything's all lubed up
00:41good.
00:41Time to put the C-clip in and spin it to 12 o'clock.
00:44The second one took me so long, left me with a couple battle wounds.
00:47Might have to go to the ER for this one.
00:48Time to gap the ring, slap them on and then we're waiting for the head to show up from the
00:53US.
00:53I've got a fat head on the way.
00:54So that'll be the next video.
Comments

Recommended