Hi guys, greetings from Finland. Been searching, but don�t seem to find the answer. My bike is 2011 xtx, with arrow slipons, DNA stage 1&2 and the rapid bike easy. Just fitted the stage 1&2 the other day and blocked the AIS. Works well and sounds nice.

Before i fitted the stage 1&2, the fuel ratio switch in the rapid bike modulator was set to +2 as the manual recomended with slipons.

So my question is, do i need to adjust it upwards since it now gets more air?

Great forum by the way, keep it up!

Firstly - Welcome to XT660.com

The answer is almost definitely yes! You're engine will be pulling in a lot more air now, so more fuel will be required. The filters will have a much bigger effect on the air/fuel ratio than the pipes.

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Thanks Pleiades, i had the same thoughts. I have it now set to +3, that is as far as the trimmer goes. Will try it out as soon it stops raining...

But i would still like to know more about the device, since there is so little info around. So any info is welcome.

There are two trimmers, first goes from 1 to 7 and says "setting". Setting for what? Manual says to set it "6 for stock bikes, 5 for bikes with aftermarket exhaust". What does that trimmer do? Should that go down with the stage 1&2?

Second trimmer says "fuel ratio", so thats a dead giveaway. It goes from -3 to +3.

Manual does�nt explain anything, it�s A4 piece of paper. It only shows how to install it, and the recomended settings for the trimmers with aftermarket pipes. Emailed dimsport(manufacturer) but they seem to be busy with something else.

Ok, took it for a test drive for about 100km. Maybe it�s just me, but seems to be running smoother, more responsive to throttle and the engine sounds better. Also felt like there is more low end torque, never been so easy to pop a wheelie, or maybe it�s just because of the better throttle response. So it was probably running a bit lean.

Still, i would like some input from anyone who have the same setup as me.
I can�t be the only one, or can i?

Well how is it wired into the bike ??
I'd guess it does a similar job to a Kev mod, but in a much more expensive way

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K+N filter, snorkel removed, homemade kev mod (with his blessing), co raised,
Pipeworx cans, r1 led back light, under tray removed, small indicators, handguards, cnc short levers,

Only Rapid bike I've come across is the same as a PC,but never gained the popularity that a PC has.

There are two Rapid Bike devices...

1) Rapid Bike "Evo" works exactly like a PC (upload and tune different maps via an interface.)

2) Rapid Bike "Easy" just links to AIT sensor (as Kev mod) and gives different resistances to choose from to fool the ECU into richening/weakening the mixture - that parts simple. However, it also connects to the O2 sensor, but what it actually does to the signal sent to the ECU I haven't a clue - is it an eliminator, modulator, controller...?

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I have the Rapid bike easy, i would have gone with pc but this came with the bike so im going with this.

Here is the link to dimsport, if somebody is interrested:
http://www.dimsport.com/rapidbike/ra...f0815f6fd821f4

Close to a Kev fuel mod + O2 controller but not quite, the difference is my O2 controller will never run the bike richer than 13.2:1, this A/F ratio controller is running below 13:1 after 3600rpm which their graph displays & is running richer & richer this would show on a Dyno a bike loosing power as it got further away from 13.2:1 + high fuel consumption. My fuel mod is adjustable for varied mods.

My O2 controller always keeps the A/F ratio parallel to the input signal, I can't see why they want it to run richer & richer below 13:1 as the revs go up.

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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

Thank you Kev for clearing that up. But this will work for me at the moment, right? Do you have any clue what the first trimmer does that i talked about earlier in this topic?

This is a bit offtopic, but has anybody fitted a turbo on the XT? I could get a second hand engine basically for free and i was thinking of a project. My friend has it on a gocart, but now he wants to fit an R1 engine on it. It,s from -07 bike and has little miles on it.