XT Newbie here, hello everybody!

I recently bought an XT660R 2006 with a lot of goodies already fitted. It has PC, Speedo healer, K&N filter and Metal Mule exhaust. Also a lot of acerbis goodies and small cosmetic mods.

The bike ran and is still running fine but something happened last week when riding home from work. I overtook a couple of cars when suddenly I felt a momentary loss of power and the sound from the bike was a bit different, a bit quieter. This happened during the overtake which made it a bit creepy.

Now it feels like I don't have 100% of the power I had before. Based on my butt dyno, there's like 90% left of what I had in the beginning. It runs OK, I can take it on the highway no problem but the peak power is missing.

Also, the final twist of the handle doesn't give the desired response. Is there something simple I should check, something that can shake loose or such? Thankful for any help! Cheers!

Does the bike have full throttle? Check the throttle body at full throttle.

Anything blocking the intake/snorkel side?

How is the packing in the exhaust anything blocking the exhaust internally?

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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 /
[
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 you help!

- It feels like the mechanical side of the throttle works since I can pick up speed when going full throttle, it just happens more slowly than before. There's like a "dead zone" near full throttle where the bike doesn't respond when I'm twisting it. How can I check the throttle body at full throttle? (Propably a dumb question but I'm a noob. )

- I will check the intake side/snorkel tonight!

- I'll also check the exhaust packing but is it a packing that should be replaced every time or is it reusable?

Most exhaust packing needs to be changed every 2 years.

Open the throttle fully, then check the throttle body to make sure you have full throttle there.

Are there any fault codes logged in the dash?

__________________
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

I'll check, I just read the diag mode howto article and printed it to take home with me.

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Yamaha XT660R

Old rides:
- Triumph Sprint RS 955i
- Suzuki DL650 V-Strom

B-I-N-G-O and Bingo was his name! I found that a rag I kept under the saddle had been sucked onto the filter thus blocking the air flow. A user error in other words. I didn't know that the filter was situated right under the saddle, on my previous DS bike it was under the fuel tank (V-strom). I will not be storing anything under the saddle from now on...and by admitting this mistake I hope to serve as a warning to others! ;D Thanks for your kind help!

__________________
Yamaha XT660R

Old rides:
- Triumph Sprint RS 955i
- Suzuki DL650 V-Strom

now thats a good result