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.