Hi all
I swear my XTR is getting slower!! anybody else heard of anything like this?
i have fitted aftermarket exhausts, however i think it has become slower since they were fitted, do i need to re jet?

nearly time to de restrict the beast...whats it like full power?? heard theyre pretty nippy!

thanks a lot!

Hi!

Have you recently dropped your bike with engine running?

DNA stage 1 & 2 filters & a fuel mod will wake up your XTR big time.

Not sure what you mean by full power, we have a 74 rear wheel HP XTX on the forum (Kriss007) now that is full power.

__________________
Click here to join the XT Supporter's scheme

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 /
[
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

The bike is fuel injected, i.e. no carburettor, and no carb means no jet either so you can't re jet. Wait til you have it de restricted and then you will enjoy the full power, from then on as Kev said you can change the filters with Hi-Flo ones (DNA stage 1 and stage 2) and your bike will go like the clappers.

The simple thing about fuel injection is the more air you let in and/or the less restricted the exhaust is, you will need to adjust the fuel as well. This is where the "kevmod" comes in. It drops the registered temperature on your air intake sensor with a variable resistor in order to richen up the fuel going in for any given throttle position.

Without the extra fuel your bike will be leaner and may actually feel slower, mainly due to the throttle not being as responsive. As I found on my non lambda 04XTR Yamaha run their injection pretty lean as standard to meet emissions laws and even with the standard exhaust and airbox, you can use the richer mixture.

Powercommanders etc programme the fuel more accurately throughout the rev range but "Kevmods" do a good basic job, especially where its needed, in the low and mid revs.

Brilliant thanks for the responce guys! its all making sence, I will definatley be looking at the Kev mods when the restrictor is out, cant wait to unleash the beast!