Imola 2 4 valve issues

Technical Small Block V Twins (not new V7s)
1

Hi,I’ve heard horror stories of 4 valve engines breaking exhaust valves.And that there are Suzuki ones that fit?

Also where to get bolt on head protectors?

I’ve just purchased an '87 Mk 2 Imola and would like to do any preventative work while I’m restoring it?

Thanks John