My 93 EVO motor really taps at 2000 rpm. Very noticable. I tried to check oil screen in timing case but can't get the plug to budge. Any suggestions out there? Special tool?

 

I use a hand held hammer impact driver with a wide balde flat tip driver.

 

You might want to try replacing the ball & spring on your oil pump check valve. If it is weak and leaking you might not be getting enough oil pressure. Also, If you are running a HD 10 micron oil filter that can restrict oil flow as well.

 

I was going to try the hand impact tool next but was unsure how much hammering the case can take without damaging. Are these plugs usually this hard to remove?

 

Yes they are this hard all the time.....start off with little taps....lol