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    • Bryan Bosch

      JUST IN!   04/24/2018

      HOW TO: 4-STROKE PISTON REPLACEMENT DONE RIGHT!
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Can't get those steering stem bearing races out? Here's how!


yz440e

I recently did my first set of steering stem bearings this last weekend. IT WAS HARD, especially to get the races out.

Here is a mock up of a cut away steering stem if you were looking at it fron the front of the bike:

Steeringstem1.jpg

I researched every old thread on TT and most said to do the brass punch way:

(you hammer at the punch on the lip of the race, all of the way around, til it gives way)

Steeringstemwithpunch.jpg

But after about 3-4hrs of trying this I was sick of the punch slipping off the race, I tried cutting the race off with a dremil but that just caused frustration and it was highly likely that i would score the inside of the head tube. The other way i found on here that would most likely work, but i did not get the oppertunity to try was running a ARC, MIG or TIG bead along the face of the old race and it will supposedly drop out when the weld cools because of the contraction when the weld cools down.

NONE OF THESE WORKED FOR ME! So i set out to develop my own method which i have not seen on TT yet:

You will need:

>Steel pipe (1-1.5ft in length) (needs to fit inside of your head tube with about an 1/8" play on either side, does not need to be exact at all)

>Metal punch, chisel or tapered piece of metal (i prefer a chisel)

>Hammer

>Penetrating fluid (optional, helps though)

THIS WILL ONLY WORK IF YOU HAVE AT LEAST A SMALL LIP!! DONT TRY UNLESS YOU CAN FEEL AT LEASET A TINY BIT OF A LIP!! 90% of bikes do have a lip.

Spray Penetrating Fluid around the part of the race that contacts the stem. Insert the pipe so that about the same amount is sticking out on either side of the end of the head tube. Move pipe over to one side of head tube. Jam chisel or tapered metal next to pipe and hammer in so it is VERY snug. Hammer oposite side of pipe and it should drive right out!! :applause: Heres a pic to demonstrate:

Steeringstemgood.jpg

This took me less than 5 minutes to do both, just repeat the other way for the top race, a very easy process.


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