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Fuel type GS750ES

salty_monk

salty_monk

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Past Site Supporter
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I have the manufacturers service manual for the 83750ES. Without starting a war (& yes I understand the different way gas is rated etc just looking for personal experience) should you use 89 Gas in it?

That's what the book says (GS1000 says 87+ from memory) so should we be using 89 in this engine (and presumable some of the other 16v engines) or has gas quality improved to a point in 25 years where 87 is good enough....

Dan :)
 
Never use less than the book says, less than 89 may be fine, but why in the world would anyone want test to see if the book was correct or not??? Just my opinion.
 
Was that motor higher compression than the previous itterations?
 
I usually run premium(93 octane) in both my bikes. The cost between low grade and premium is not significant in terms of the amount of gas I use.
 
Dan, I think 91 will work well but I know you limeys are cheap & can save money on cheaper gas for more beer!:DRay!!!:D
 
I use what ever is cheapest, as long as the motor does not ping
 
:lol: Who knows if it pings... I haven't ridden it properly yet, it's in pieces. I know the 1000's are exactly the same on any gas... suppose I *might* be able to put slightly more advance on them if I stuck to premium but no real need.

I can probably tell you the compression ratio, yes I think it is slightly higher but I didn't think those engines were that highly tuned at 84hp...

Dan :)
 
I have an 83 750 t, and always use 93, and it loves me for it...
 
salty_monk said:
... suppose I *might* be able to put slightly more advance on them if I stuck to premium but no real need.
Click to expand...
Why put a Band-Aid on top of a Band-Aid? :-k

"Premium" gas does not have any more power in it than "regular" gas, in fact, it contains fewer BTUs per gallon, therefore, less energy. It was designed to prevent pre-ignition (pinging) caused by higher temperatures in a higher-compression engine. It also burns slower than "regular" gas, so the ignition needs to be advanced to get the cumbustion done by the proper time. By doing both of these things, you will now have an engine that puts out slightly less power than stock, due to the fewer BTUs available.

If you want more power, you will need more displacement, higher compression or higher engine speed (with adequate breathing). Any of these (especially higher compression) might raise compression temperatures enough to warrant fuel with a higher octane rating, but if your engine is stock, you likely don't need it.

But, that's just my opinion, and you are certainly entitled to it. :D

.
 
Steve,

It fairly closely matches my own.. Just intrigued as to why Suzuki would call out 89+ on this model when they call out 87+ on the older ones...

Presumed it was compression or something to do with the TSSC chamber...

Dan :)
 
Hmm.. that's Avgas (actually it's not, it's something else that I don't remember), the helicopter I flew used that :lol:
 
Take note that there are two different methods to rate octane: Research and Motor. A fly in the ointment is that in the US, the number on the pump is commonly somewhere in the middle of these two measures.

For the 750ES, the manual calls for 85 -93 Pump octane or 89 Research. Regular 87 Pump octane fuel fits into this range.

I suggest using regular gas in the bike and see how it works. The four valve head engines have more compression but they also have a far more efficient combustion chamber so that more than offsets the compression thus allowing the use of regular gas.
 
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I think Steve provided the bottom line on this one... it says 89+ because you can't hurt the engine using higher octane gas, it's just a waste. I work with the renewable diesel industry and have been in the room with fuel guys from the major O&G companies who have said exactly the same thing as Steve in regards to high octane gas. The only other benefit would be from branded gasoline that has other kinds of additives like cleaning agents (sludge, varnish, injector cleaner), lubricants, etc.
 
i use reg what is it here 87-89 somwhere aroung there..

then about every 10 -15 tank i use the highest i can buy 94 i think (somtimes a tank sometimes 1/2 ). just to make sure its running nice and clean.. works for me.. but i know some people say its a waste
 
Just another detal to add to that excellent post by that Steve guy. :eek:

Octane requirements decrease with altitude. That is why, when travelling in the Rockies that you will see "regular" gas listed with 86 or even 85 octane. I have used it sucessfully unless I was pulling a trailer through the mountains and the added heat was making it ping a bit. Then, I used the mid-grade which I think was 87 octane.

.
 
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