93 octane in a '92 /140

[11WFLA]

I recently bought my 19'6" Aquasport with a 1992 Johnson 140...seller claimed recently rebuilt..he said run 93 octane...I've run about 30 gallons thru it.It has a 50 gallon enclosed tank. Manf. says use 87 octane <br />1. should I begin using 87?<br />2. Am I doing damage if I burn the rest of the 93 out ? Or should I drain it out and start over with an 87 oct mix?...thanks

 

[Hasbeen]

Re: 93 octane in a '92 /140

The only reason I can think is if he shaved the heads and increased the compression! (ask him) If not then you are just flushing money down the toilet! Also maybe even causing excesive carbon buildup!<br /><br />Hasbeen

 

[Solittle]

Re: 93 octane in a '92 /140

You can run out the 93. I would add the 30 gal of 87 that you have already used.

 

[11WFLA]

Re: 93 octane in a '92 /140

Thanks for the advice

 

[93bronco]

Re: 93 octane in a '92 /140

just curious on what prop you are running with that?<br />about how much does your boat weigh & what speed /rpm are you getting?<br /><br />i have a 94 18ft w/a trophy with a 1988 140tx.<br />the boat weighs in at 1950 to 2100.<br />i have 3 props 17, 19 & 21 pitch.<br />i know what the omc accessory book for 88 says, but that is just general.<br />just thought id ask, thanx