In any language it means that unless you do the mods (NADS) particularly on the ZD30 DI, you run a very high risk of number 3 and 4 pistons grabbing hold of the cylinder wall and causing the motor to be replaced. KA BOOM!! capish? finito, end of story, finito la musica, vooshtabar.............. BANG!
Cheers, the ferret.