I have owned 43 motor cycles & have just about modified everyone, I don't think I have ever owned a perfect bike. The XT responds well to most mods & it does change the ride for the better.

5/ Fuel devices.

1/ Power Comander PCIII & PCV
http://www.off-the-road.de/Other-bikes/Engine-Tuning/Dynojet-Power-Commander-Yamaha-XT-660.html?listtype=search&searchparam=power%20comma nder

2/ Rapid Bike
http://www.rapidbikeusa.com/cgi-bin/shopper.cgi?search=action&category=1287&keywords=a ll

3/ Ignijet
http://www.ignitech.cz/english/ignijet/ignijet.htm

4/ Memjet
http://www.memjetmodule.com/products-page/yamaha/

5 SFI
http://www.staintune.com.au/sfi_yamaha_xtx660.htm

6/ The Kev Fuel Mod.
http://www.xt660.com/site/node/136

Can's
http://www.xt660.com/site/node/333

DNA filters, send a PM to Captmoto for a price including your forum discount.

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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