1989 kx125 restoration master thread

[bens87braap]

Not sure about the bearing someone might have an idea but this is from Sandblaster

Yep, about 1/2 way down this page:

http://www.oem-cycle.com/forum/viewtopic.php?f=5&t=376&start=40

Case lapping

[queen of spodes]

Not sure about the bearing someone might have an idea but this is from Sandblaster

Yep, about 1/2 way down this page:

http://www.oem-cycle.com/forum/viewtopic.php?f=5&t=376&start=40

Case lapping

An inmate at ADVRider urges caution.  Thoughts?

[sandblaster]

Sure, don't sit there for 20 minutes sawing back and forth in the same spot 
You do one bolt for about a minute, then move the bolt and do that one for a minute.
Keep moving the bolt around in a star pattern.
When your done the vacuum will make your cases stick together 

[bens87braap]

I followed ur Instructions helping my mate with a rm 250 miss matched cases that leaked and we both very happy with result Like u said dont stay in same spot for too long

[sandblaster]

It works so easy that you don't think it's doing much.....
But it does.
Thanks goes to Motorrad for turning us on to the stuff...

[queen of spodes]

From the ADV thread, did you experience any clearance or alignment issues with bearing cutouts?   Or were you using matched cases?

[sandblaster]

I have used matched and mismatched cases with zero problems.
In fact, I did a 01 cr125 right case with a 91 cr125 left case about 4 months ago.
It worked marvelous 

[queen of spodes]

I pulled out the cases last night to check gap.  My smallest feeler gauge is .008" and it won't slide in - but I do see some light coming through the gap.   I also matched up the original case (with broken drain plug) and it too had a little light shining in but not much. 

I'm thinking a very light touching up with the lapping compound will do the trick.  Some good karma was passed my way thanks to Sandblaster, so I should be able to get the lapping done next week (or maybe before depending on how quick mail runs). 

Plan to drop by home depot to pick up some small diameter threaded rod tonight.


Question - I do want to finish cleaning up the cases a bit.  The soda blasting got a lot of crud/dirt off, but there are spots that are black (the guy said it was carbon).   What's the best (cheapeast) way to get that stuff off?  Would a polishing wheel on my dremel tool work with some metal polish?   Do I need some fine grit sandpaper?  I don't want to mar up the finish nor do I want the cases to turn "chrome". 

[queen of spodes]

Easier than expected!

1/4" threaded rod, had to grind it down a little then notch with a hand file. I used a hacksaw to get a little reverse bite on the edge. 

Used a tiny allen wrench to put in the bearing inner race behind the puller rod, to keep it snug.









I also used a little MAP gas (only 4-5 seconds).   Used a socket to knock it out.



One more to go, hope to get to it tomorrow:

[sandblaster]

Nice job.
It's amazing what a little ingenuity can do for you when you really want to make progress but don't have the right tools..
And as always, heat is your friend...

[burn504]

since I am restoring an 89 kx125 and I am a powder coater that owns every type of blaster including a wet blaster. I can tell you the way to get those cases clean is to chemical strip them and then if not clean enough aqua blast with bead. Bead is very different than most media because it is round it wont impregnate and it has a soft rating than say aluminum oxide, slags or even crushed glass.

but the answer is industrial powder coat stripper. if you were local id let you put it in my tank

[queen of spodes]

I know of a powder coater with that kind of remover.   It won't etch or ruin the AL finish?   How long would you leave them in the tank?

I was about to get to work with a drill. felt pads and polish today.   

[queen of spodes]

Down to the last small bearing.  This one is located across from the water pump.  Almost no room to get my homemade tool behind the bearing race. 







Does the tool need to be paper thin?  To be continued....

[queen of spodes]

 

[queen of spodes]

Here's a thread on KDXRider.net with some suggestions on getting this tiny bearing out. 

Just tried heating the case, putting some cold compressed air on the bearing, then tapping it out with a deadblow (while holding case).  No dice. 

Will try to fab up another edge do that again.  After that I don't know what to try (without damaging the case). 

:/