the valve clearance is EX .013" and IN .006" You have to remove the body covers and fuel tank. you can use the pull start cord and slowly pull it until you can feel it go on to compression remove the spark plug and put a blunt shaft down the cyl don't drop it in, you should feel the piston at TDC, Now you can set the 4 valve clearances.
The book way is to remove the fly wheel plug on the RH side next to the pull cord (chrome plug with a hex head in it) remove the valve covers and watch the intake valve ( closest one to the carby) go down then up by pulling the pull cord slowly as it comes to a stop (up) look in the hole next to the fly wheel and you will see a "T" mark on the fly wheel when you see that the engine is at TDC. Dont use the "F" mark.
Local shop told me that there's no need to do valve adjustment on 2003 Accord.
PCV valve (A)
.006
http://www.bluepoof.com/motorcycles/howto/svs_valves/
To do a valve lash on a 2003 Honda Accord make sure a lash gauge is on hand. Valves lashes adjust the valve to piston clearance on cars. Be sure to use the appropriate specifications of clearance for the 2003 Accord.
They are to set @ .005 in
Valve lashes only need to be done when the valve piston clearance inside the engine is off. Factory service manuals will list the appropriate clearance levels for the 2003 Honda Accord.
The clearances for this bike are as follows: Intake valve 0.05mm / 0.002in. Exhaust valve 0.08mm / 0.003in.
.0002in or .05mm intake and exhaust
I think the only way to can adjust valves on Toyota engines is to replace them.
i tried all procedures, and mine still won't go off!
the manual say's that both valves are .13mm