Recently diagnosed that my relatively new (2nd hand bike) with 8000 miles is buring oil. Took it to a rolling road and discovered its burning the oil on the overrun. Now Im not an expert in this but the guys helping me out decided this is what is happening and could not think why??? jap engines are usualy spot on! right?

Any way Il be stripping the head (with help) and getting the valve seals checked and replaced if necessary and also have everything else checked while shes opened up.

Ive also put some leo vince cans on and will soon hopefully do the fuel mod.
However (as I have mentioned before) it seems to be running slightly rich already. pretty heavy soot and smells pretty rich too. (but the plug is pretty clean)

The fuel mod will only make it richer?
Not really sure what steps to take to get it running as best as possible.

Anyone care to attempt to educate me would be fantastic

How is the oil level, is it over full?

Did they confirm on the Dyno that the bike is running rich as in A/F ratio?

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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

Thanks for the reply. Unfortunately I was not there. My father took it to see has friend at sammy miller's. Not sure exactly what they did but the mechanic said it was running a bit rich.
As for the oil level it's been varied lately due to the bike burning oil. Just rode it across spain and did close to a liter of oil.