Maintenance & Technical > KX100 / KX85 / KX80 / KX65 / KX60

First time top end rebuild

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BLACKBEARD:
First of all I'm new here. But i just recently got back into the dirt after a lengthy stint with the whole streetbike scene. I got myself a 03 kx100. The cylinder,piston and head will need replaced. I've always done repairs and maintenance on mine and my fellow riders in the past, but never rebuilt a whole top end. I've got the head and cylinder off. What should I be looking for in this process? I guess I should drain the fluids and try to flush the bottom end thorally? Any info at All would be a Big help. Thanks in advance.

sandblaster:
Hello BLACKBEARD.
Welcome to the site.
There is a ton of great info and guys on this site.
One of the first things I would recommend you do is buy a Clymer Service manual.
There is more documented info in there then you could write about in a year, specs, pics, tolerances, ect.


--- Quote from: BLACKBEARD on July 28, 2013, 03:10:28 AM ---What should I be looking for in this process? I guess I should drain the fluids and try to flush the bottom end thorally?
--- End quote ---

That certainly wouldn't hurt.
Since you have the top end off I would measure your connecting rod to crank side play with a feeler gauge.
From there it would all depend on what you find...

Motorrad:
Leakedown test BEFORE dissasembly.     

BLACKBEARD:
I know nothing about a leakdown test to begin with,or the results I'm testing for. Do I need a tool for that? as far as the disassembly I already have the cylinder head and piston off.

sandblaster:
Too late for a leak down.... :lol:
Then again you could reassemble it and do a leak down test...
However, If you measure the rod to crank clearance that will tell us if the crank needs to be replaced.
If it does need to be replaced, then it's time to replace those leaky seals anyway...

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