Hello Tew,
Kawasaki uses several tightening torques for all sorts of bolts and nuts, you did not specify which was the problem. But I looked into the Kawasaki EX250R service manual and found a table with relating tightening torque to thread diameter. This lists the basic torque for the bolts and nuts. You cannot use this table for engine parts, if it is a engine part which is not tight enough you have to specify which bolt or nut it is, and I give the correct torque.
It is maybe also a good idea that you call Kawasaki, as one of your first service checks is as I belief after 800 kilometers, Khon Kaen is about 400 to 500 kilometers from Bangkok....