Questions on rebuild or check out engine

[overbore]

Can anyone tell me what they look for when tearing
down motor?rings,bearings,ect,and what are the
2 dimensions that I need that I heard or read
somewhere?How often should a person change
main crank bearings,big end ,small end?
Thanks ahead of time for any and all answers
as I would like to get a Ideal on wether its just as
cheap to send off or do myself.
Its a 2002 exc 200 and hasnt been touched yet.

 

[HobRoff]

Eric Gorr recommends on 200cc and less once a year for lower end rebuilds, top end at the very least, my opinion, once a year. Check out the link to the left, good info and very competitive pricing if you decide to have someone else do it.

 

[overbore]

for the help.Do you or anyone know what the clearances
that I am supposed to look for.power valve and top of piston
I think.Need to know or I might as well buy a service manual
for the 200 exc.Still need to know what it is that I need to watch out
for.Thanks overbore.

 

[I'm xlr8]

What you're looking for are the X and Z dimensions. X is the distance of the top of the piston (@ TDC) from the top of the cylinder deck, and Z is a measurment from the bottom/middle of the power valve to the top of the cylinder. You need a manual to get the specs.