(a) The following standards apply to outboard and personal watercraft engines produced before the model years specified in §1045.1 (since the end of the phase-in period specified in 40 CFR 91.104):

(1) For engines at or below 4.3 kW, the HC + NOX standard is 81.00 g/kW-hr.

(2) For engines above 4.3 kW, the following HC + NOX standard applies:

STD = 6.00 + 0.250 · (151 + 557/P0.9)

Where:

STD = The HC + NOX emission standard, in g/kW-hr.

P = The average power of an engine family, in kW.

(b) See 40 CFR 91.104 for standards that applied to outboard and personal watercraft engines during the phase-in period.