Which octane

[MostroS2R]

Should I use 87 octane in my S2R???

[LA]

No, the book says 95, so you have to use 95.

Do we get to redo all the old post?

LA

[CDawg]

I don't know how to response...everyone's got low post score so I cannot tell if this is sarcastic....

Ah screw it, I'm going to chomp...

2 School of thought:
1) lowest possible without engine pinging...typically ~87
2) go by the manual (you have to do the RON MON conversion thing), but loosely translates to ~91

I've used 87 and have had no ptoblems with it. I's currently using 89 to split the middle.

[Drunken Monkey]

Euro 95 (as in The Book) = 91 US.

89 is pretty damn close and should be fine.

[TCK!]

I personally use "Regular" on my monster and "Premium" in the 748...

[caffeinejunkee]

"regular" with no problems so far

[MostroS2R]

I've been using 87 and didn't notice any pinging. But I read somewhere on another forum that a rider was getting some knock.
I think I'm getting a little knock under hard acceleration though. I'm going to try a tank of 91 and see how she runs.

[He Man]

you want to ideally use the lowest octane fuel you can becasue it will burn the best.

I use to use 91, ~25mpg then 89 ~27mpg, now im on 87 ~33mpg. And i also started to shut my engine off at lights ( i take my route pretty regularly, so i know which lights take forever) and my in city mpg (NYC dead bumper to bumper traffic) shot up to 44mpg. IN CITY!

[Alex]

This thread really should be a poll...

I vote for 87 octane. Only prissy little girls use premium.

[somegirl]

87 for me, no problems on my 695.

[eltristo]

87-89, depending on my mood.  Or my shirt.  Which sometimes dictates my mood.

[stevesbike]

A close monster buddy of mine who owns the brown (rust patina) M900 that was at Stewart's open house has only used 87 it's whole life and it's pushing 84k (ya that's right 84,000 mi.) and it runs great and has never had any problems.

[johnster]

Valve contamination buildup is more prevalent w/higher octane fuels, but my bike does ping a little w/87.....

-I find 89 to be a happy medium....

[MostroS2R]

I'll give 89 a shot and see if it makes any difference. I might just be hearing normal noise under hard acceleration.

[EEL]

no issues on my s2r for the last 11k with 87 octane

no issues with my old m800 --16k --87 octane