I'm looking at changing the sprockets on my XT660R and planning to do this in two steps to check the results - both changes can utilise the standard chain.

Firstly changing the front spocket to 14 teeth - reduction 1 : 3.214
then changing the rear sprocket to 46 teeth - reduction 1 : 3.285

I was thinking about a Supersprox (alloy / steel construction) on the rear but can't seem to find anything for the front listed locally.

Can anyone point me in the right direction ? I'm generally happy to pay a little more for quality.

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Regards
Pete

expat Kiwi - now living in Melbourne - now riding a XT660R and a XT1200Z

Pete, I recall reading somewhere that a 14T front sprocket is bad news for chain wear. If you can, you would be better off trying to achieve your chosen ratio by altering just the rear sprocket. Anyone else care to comment?

I have tried most of the different sprocket ratios & found 15/47 to be a good balance for more slow speed throttle control. The 14T is nice for slow speed throttle control but is no good for cruising at 100kph & over.

15/46 is also a good ratio if you do more cruising over 100kph.

I have a brand new 47T rear sprocket in steel if you are looking for one. Depending on how many kms are on your chain you might need to add a link to fit the 47T.

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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