A couple more notes:
1.) Took the head off the EX to check the torque on the head gasket again (Cometic Fiber composition w/ SS fire ring). The first time I checked it after about 1 hr. run time, it needed to be re-torqued. This last time, after another 2 hrs. NO re-torque necessary. Good idea to go back and check it if you have a composition type gskt.
2.) The holes that are left exposed after removing the de-compressor do not go thru into the oil passage, so there's no need to weld them up. No oil loss there!
3.) Honda puts a paint mark/indicator on the end of the outer valve spring that goes up (wider spaced coils). They do not mark the inner coil.
Mods: Big Gun FS w/MM quiet core, no lid , K&N, FCR41, 11.3:1 440 and Web 479 cam, porting, no choke. Works TRS fronts & Ultracross rear shock, a few other goodies
450R,250EX, Blaster, Banshee