Kawasaki Forums - 97 STX 900 Gas/Oil Ratio

Kawasaki Forums (https://www.kawasakiforums.com/forum/)

- Kawasaki Jet Ski's (https://www.kawasakiforums.com/forum/kawasaki-jet-skis-55/)

- - 97 STX 900 Gas/Oil Ratio (https://www.kawasakiforums.com/forum/kawasaki-jet-skis-55/97-stx-900-gas-oil-ratio-33266/)

97 STX 900 Gas/Oil Ratio

Does anyone know the correct gas to oil ratio for a 1997 STX 900. I just replace my engine with a used engine, don't trust the oil pump and want to run pre-mix gas/oil. need the ratio.

Thanks.....

I did a google search on this topic recently. I have a '95 750 STS with the oil blocked off & run pre-mix.
There were a lot of different referrences... most with different answers.
The most authoritative referrence was on a SBT forum ( they sell motors & stuff, including oil block-off kits I think) which said all kawasakis with factory stock oil injection pumps generate 50:1 ratios at WOT, and down to around 150:1 at idle. They listed all the PWC brands and most were either 40:1 or 50:1. Breakin periods called for more oil temporarily.
Several followup replies challenged their answer, but the official techie moderator was adamant that all Kawis were 50:1.