We have a station in town that has a pump just for 100 octane race gas when I had the Harley, I would fill it up once in a while. was told it was good for the motor. ran pretty strong. How would the RS handle that kind of Octane?

A significant amount of fuel would be unburned causing the motor to run cold and heavy carbon deposits to form on the piston, heads, exhaust valves and stems, eventually causing the exhaust valves to stick slightly open. Fuel mileage will also suffer.

Jim

are you running hc pistons or have any head work done? if yes you should run a high octane at least once in a while, i run only 93 and above

Yeah, for sure dont do it. If ya want to do a nice thing for your motor then run some Seafoam thru it once a month or something.

What does seafoam do to the motor? and how do you use it? stupid question but then again I ain't no genious......


VikingWarhorse wrote:
Yeah, for sure dont do it. If ya want to do a nice thing for your motor then run some Seafoam thru it once a month or something.

For some reason folks think the higher the octane level the "better" the fuel. It's just not so. Octane has no real bearing on the energy content in gas and is added to allow the air/fuel mixture to be compressed to a higher level before spontaneous combustion will occur.

Using fuel that has a higher ocatne level will not (not matter what you think) make your engine better, faster, more efficiently, smoother nor will it wring out more horses. High performance engines run it because HP engines are high compression engines. HC engines require more octane to delay the point where fuel ignites so that the engine can fully compress the air/fuel mixture.

The engine in a stock RS isn't HC, so would benefit 0 from higher octane fuel.

-M7

wilbur1861 wrote:
We have a station in town that has a pump just for 100 octane race gas when I had the Harley, I would fill it up once in a while. was told it was good for the motor. ran pretty strong. How would the RS handle that kind of Octane?



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With stock pistons & low 8.3ish compression 87 octane in moderate temps & light to moderately loaded (riding 1 up little to no baggage)and 89 octane in warm to hot temps if bike is being ridden 2up fully loaded especially in a hilly area loading motor more then normal is the max octane the R* motor can efficiently use by design.

I have heard the motor on my 06 silverado ping a bit in warmer temps riding 2 up fully loaded in hilly areas which is why i run 89 oct fuel in that situation which stops the ping/detonation that can over time cause engine damage.

Iv'e run the 2 point higher octane fuel in my R* for 3 seasons so far & the small 2pt inc in octane didnt seem to cause any excessive carbon buildup.

I chk'd plugs & looked in cyls with plugs out with srong light and pistons dont look excessively carboned up either.

So from my experience it's seems just fine to run only 2pt's higher 89 octane fuel to stop possibly damaging detonation on hot days with bike loaded and i did notice the motor seems a litte happier /ran a bit coller with the 89 fuel in warmer to hot temps too.

On hot days with 87 oct fuel when i would shut it down from it's approx 900-950rpm idle it would sometimes try to run on/diesel a bit but with 89 fuel oct fuel on a hot day that seems to make the motor run a bit cooler it would never do that. (I'm running full syn mobil-1 v-twin 20-50 & not std dino that can make a lrg air cooled old school v-twin run a bit hotter)

But 100 octane is way too much for the R* motors low compression & head-combustion chamberdesign . Running 100 octane fuel would actually do more harm then good in a stock low compression R* motor causing excessive carbon build up in combustion chambers & on valves & pistons too that could lead to SVS and it's all down hill quick from there.

Scott

twotone wrote:
What does seafoam do to the motor? and how do you use it? stupid question but then again I ain't no genious......


VikingWarhorse wrote:
Yeah, for sure dont do it. If ya want to do a nice thing for your motor then run some Seafoam thru it once a month or something.

twotone, seafoam is a gas and engine oil additive that works wonders. I use a half can about every 4 tanks of gas. There is a noticible difference in power and economy. It does an outstanding job of cleaning carbon deposits from carbs and valves.

Used in the engine oil it does the same thing, it cleans the internal engine parts, i use it in the oil prior to changing the oil. I swear by this stuff. I have 35,000 miles on my 2000 Road**** and i have no issues with fuel even after she comes out of storage.

tlaccopp wrote:
twotone wrote:
What does seafoam do to the motor? and how do you use it? stupid question but then again I ain't no genious......


VikingWarhorse wrote:
Yeah, for sure dont do it. If ya want to do a nice thing for your motor then run some Seafoam thru it once a month or something.

twotone, seafoam is a gas and engine oil additive that works wonders. I use a half can about every 4 tanks of gas. There is a noticible difference in power and economy. It does an outstanding job of cleaning carbon deposits from carbs and valves.

Used in the engine oil it does the same thing, it cleans the internal engine parts, i use it in the oil prior to changing the oil. I swear by this stuff. I have 35,000 miles on my 2000 Road**** and i have no issues with fuel even after she comes out of storage.
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Seafoam does state on the container that it can also be used as a fuel stabilizer too but i have not ever used it as a fuel stabilizer for longer term storrage so dont know how well it does in that app.

But i do throw a dose of seafoam in my R* fuel tank every so often (2x-3x per riding season) as preventaitve measure against SVS because it can remove carbon from ex valves & stems to help ward off SVS along with removong carbon from combustion chamber in general & pistons too while also cleaning up the carb too.

Some guys that have had minor clutch slippage that may have been due to running pass car or truck oil with friction mods in it have used seafoam in the oil the seemed to clean the fric mod material/substance off the clutch plates stopping the clutch slip wich is another plus for seafoam.

BTW,in a pinch another great carb/carbon cleaner for the R* is Chevrons (says " Super Concentrated " on label) fuel inj/carb cleaner in a black plastic container (called " TechTron " or something like that) also does a very good job of cleaning carbon & carb on RS too, but it's not meant to be used in the crankcase oil like seafoam is.

Scott

Actually Seafoam should be used several times a year with standard jetting for fuel econemy, for rich performance jetting generally 3-4 times a year averaging around 7-8000 miles a year. still making sure your getting quality fuel not watered down!

I use seafoam in all my vehicles, bikes,outboard motors,quads some sit in storage for 7-8 months engines fire right up.... even the old lawn mower!





Samson