do i need a special tool?

[scalded dog]

Have a midnight special, 81, motor is shot, not much left on it, but was trying to save the pick-up coils, the clymer manual calls for "two screws" to be removed, it don't have screws it has what looks like a nut inside an aluminum housing, 4mm or 4.5 dosn't work, and they were the closest size I had, just wondered if it takes a special tool. Thanks, 'Dog

[bikerphil]

You have to drill the heads out. Yamaha used tamper proof bolts on the 80 and up motors so the timing couldn't be altered (EPA).

[petejw]

Theres also 3 screws that hold the assembly
in, you can remove these 3 screws and the guts of it
will come away.

[scalded dog]

Thanks for the replys, I spent about an hour trying different things, to get them loose. LOL. Now I know what to do. Later 'Dog