Hi again,simple question can I ran my O4 XTX on 99RON fuel

regards yanni

If I understand higher the octane the better.

I run on 98 pumpgas in My -06 bike.

Thank you Rubu !!!

will not do damage but it is a waist of money, with the original 660 engine compression 95 ron is enough.

There is also a theory that most people are using the 95ron at the gas station so it is more fresh then the more expensive fuels, but as said it is only a theory.

If You are using Your bike as a taxi, there is a difference how much 98/99 costs compared to 95...

I think if Your towns 98oct runs out of date maybe You should think about moving closer to civilication?

from my observation in most stations the 98 or 100 pumps are always empty, but this is not the issue the issue is that every fuel above 95 ron will not give any benefit to the motor it is not cleaner (like some people think) and it doesn't have any higher quality of some kind, the motor of the XT doesn't know if you run 95 or 100.
I am surprised that in the era of the internet people still don't know what is the meaning of octane.

If You are running standard XT, Pegaso is right that it can be a waste of money to drive higher octane than 95.

I like to think that the higher the octane is the "safer" the fuel is to My engine in all driving conditions.

All the comments are good.
The XT660 engine only needs 95 RON according to the spec so this is all you need.
If it had knock sensor, then the engine management would optimise the ignition timing for the grade of fuel you use; which in the case of 99 RON, it could be beneficial.
However there is a twist.....
In the last 10 years or so, fuel companies who have started producing high octane fuel (think shell & BP), have been putting special additives in to improve engine running & clean at the same time. So you are not only buying a higher octane but also a chemically more advanced fuel.
So you may not be wasting your money when you buy premium fuel for your XT.
The best bet is to try it yourself. Run 4 tankfulls of your specific fuel & see what you get

The knock sensor allow the bike to use low grade fuels bellow 95 ron (like in poor countries) and it will react to pre-ignition, because fuels above 95 ron doesn't cause pre-ignition the knock sensor is redundant and no ignition timing will be change so bottom line a knock sensor can not detect between 95 or 100 octane in bikes with a compression rate like the XT.

I had been running my 07 XTX on RON 91 for quite a long time without the bike pinging. I tried my new one yesterday on RON 91 & it ran quite fine no problems.

My 04 XTX did not like RON91 fuel it used to ping at low rpms. I did once mention that the timing was adjusted by the factory on 07 ECU's>.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946