{{Short description|Type of motorcycle}}
The '''KTM 690 Duke''' was a motorcycle developed for KTM's line of midrange LC4 single-cylinder engine supermoto, or naked motorcycles that began with the 1994 {{convert|609|cc|cuin|abbr=on}} displacement '''Duke 620''' or '''Duke I''', followed by the 1998 {{convert|625|cc|cuin|abbr=on}} '''Duke 640''' or '''Duke II''', followed by the {{convert|654|cc|cuin|abbr=on}} '''Duke III''', and finally the {{convert|690|cc|cuin|abbr=on}} '''Duke IV''' made since 2012. Both the Duke III and Duke IV are called the '''690 Duke'''<ref name=firstride>{{cite web |url=http://www.cycleworld.com/2015/12/11/2016-ktm-690-duke-naked-motorcycle-review-first-ride-photos///|last=Montano |first=Thomas |title=2016 KTM 690 Duke – FIRST RIDE REVIEW | publisher=Cycle World |accessdate=February 14, 2016|date=December 11, 2015 }} </ref> thumb|2018 KTM 690 Duke {{See|KTM Duke series}} {{Also|KTM 690 series#690 Duke}}
{| class="wikitable" style="text-align:center; font-size: 100%;" |- ! colspan="7" |Specifications by model/year |- ! Year !! 1994–1997 !! 1998–2007 !! 2008–2011 !! 2012 !! 2013 !! 2016–2018 |- ! Model || 620 Duke I || 640 Duke II || 690 Duke III || 690 Duke IV |colspan="2"| 690 Duke R |- ! Displacement || {{convert|609|cc|cuin|abbr=on}} || {{convert|624.6|cc|cuin|abbr=on}} || {{convert|653.7|cc|cuin|abbr=on}} || {{convert|690|cc|cuin|abbr=on}} || {{convert|690|cc|cuin|abbr=on}}||{{convert|693|cc|cuin|abbr=on}}<ref name=review>{{cite web |url=http://www.motorcycle.com/manufacturer/ktm/2016-ktm-690-duke-690-duke-r-first-ride-review.html//|last=Brasfield |first=Evans |title=2016 KTM 690 Duke & 690 Duke R – First Ride | publisher=Motorcycle.com |accessdate=February 16, 2016|date=December 2, 2015 }} </ref> |- ! Engine |colspan="5" | Liquid cooled, 4-valve SOHC 4 stroke single || |- ! Starting || Kick || Kick & Electric ||Electric | colspan="2" | Electric & Auto-decompress|| |- ! Bore × stroke || {{convert|101|x|76|mm|abbr=on}} || {{convert|101|x|78|mm|abbr=on}} || {{convert|102.0|x|80.0|mm|abbr=on}} |colspan="2" | {{convert|102.0|x|84.5|mm|abbr=on}} || {{convert|105.0|x|80.0|mm|abbr=on}} |- ! Compression ||10.4:1|| 11.5:1 || 11.7:1 ||colspan="2" |12.6:1|| |- ! Fuel system || Dell'Orto carburetor (49-state)<br>38 mm Edelbrock Qwik Silver II (CARB) || Mikuni BST 40mm carburetor || Carburetor <br>(''2008'') <br>Keihin EFI <br>(''2009–2011'') |colspan="2"| Keihin EFI 3 modes || EFI Keihin 50 mm throttle body |- ! Ignition |colspan="2" | Kokusan contactless DC-CDI || Kokusan DC-CDI Digital, 3 Modes, Single Spark plug. |colspan="2" | Digital, 3 modes, twin spark ||Digital, 3 modes, twin spark |- ! Transmission |colspan="2"| 5-speed, chain drive || 6 speed, chain drive, Slipper Clutch | colspan="2" | 6-speed, chain drive, slipper clutch|| |- ! Frame |colspan="5" | Chromoly Steel trellis, aluminum swingarm ||
|- ! Front brake |colsspan="2"| Brembo 4-piston caliper, 320 mm disc || Single Brembo four-piston radial caliper, 320 mm disc || Single Brembo four-piston radial caliper, 320 mm disc || Single four-piston radial caliper, 320 mm disc, ABS ||Single four-piston Brembo M50 radial caliper, 320 mm disc, ABS|| Single Brembo M50 four-piston radial-mounted caliper, 320 mm rotor, Bosch two-channel ABS |- ! Rear brake || || Brembo 1-piston caliper, 220 mm disc || Brembo caliper, 240 mm disc |colspan="2" | Single four-piston caliper, 240 mm disc|| 240 mm floating single-piston caliper |- ! Front suspension || WP 4054, Top Adjuster, telescopic fork || WP 43 inverted fork || 48 mm WP inverted fork, adjustable preload, compression, rebound, {{convert|5.6|in|abbr=on|order=flip}} travel || WP inverted fork {{convert|135|mm|abbr=on|}} travel ||WP inverted fork, adjustable preload, compression, rebound, {{convert|150|mm|abbr=on}} travel|| WP 4 3mm inverted fork |- ! Rear suspension || WP monoshock 4681 BAVP, Single Adjuster || WP monoshock || WP monoshock, adjustable preload, compression, rebound, Pro-Lever, {{convert|5.6|in|abbr=on|order=flip}} travel || WP shock, adjustable preload only, {{convert|135|mm|abbr=on}} travel || WP shock, adjustable preload, compression, rebound, {{convert|150|mm|abbr=on}} travel || WP linkage-actuated gas-charged shock adjustable spring preload |- ! Wheels || Akront wire-spoke, 17 × 3.5" front<br>17 × 4.5" rear || 17 × 3.5" front<br>17 × 4.5" rear ||17-inch 5 spoke Marchesini forged Alum wheels|| || || 17-inch, 10-spoke forged-aluminum |- ! Tires || Pirelli MT60 radial<br> || 120/70-17 front<br>160/70-17 rear || Dunlop Sportmax GPR<br>120/70-ZR17 front<br>160/60-ZR17 rear || || Michelin Pilot Power<ref name=MC2013>{{cite web |url=https://www.motorcycle.com/manufacturer/ktm/2013-ktm-690-duke-review-video-91645.html|last=Duke |first=Kevin |title=2013 KTM 690 Duke Review | publisher=Motorcycle.com |accessdate=December 16, 2025|date=April 1, 2012 }} </ref> || Metzeler MR77 <br> 120/70-17 front <br> 160/60-17 rear |- ! Rake, trail || || 26.5°, {{convert|109|mm|abbr=on}} || 26.5°, {{convert|4.53|in|abbr=on|order=flip}} |colspan="2" | 26.5° || |- ! Wheelbase || || {{convert|1460|mm|abbr=on}} || {{convert|57.9|in|abbr=on|order=flip}} || || || |- ! Seat height || {{convert|35|in|abbr=on|order=flip}} || {{convert|900|mm|abbr=on}} || {{convert|34.5|or|35.25|in|abbr=on|order=flip}}<ref name=Connor2008/> || {{convert|835|mm|abbr=on}} || {{convert|865|mm|abbr=on}} || |- ! Dry weight || || {{convert|152|kg|abbr=on|}} || {{convert|334|lb|abbr=on|order=flip}}<ref name=Canet2008/> |colspan="2"| {{convert|149.5|kg|abbr=on|}} (claimed)<ref name=KTM/><ref name=KTM-R/> || |- ! Wet weight || {{convert|340|lb|abbr=on|order=flip}}<ref name=CW1995/> || {{convert|161|kg|abbr=on}}<ref name=VisorDown2002/> || {{convert|354.0|lb|abbr=on|order=flip}}<ref name=Coe2010/> || {{convert|352|lb|abbr=on|order=flip}} (claimed)<ref name=Brown2012/> || || |- ! Fuel capacity || {{convert|10.3|L|abbr=on}} || {{convert|11.5|L|abbr=on}} || {{convert|3.57|usgal|abbr=on|order=flip}}|| || || |- ! colspan="7" | Performance |- ! Power || || {{convert|54|bhp|abbr=on|order=flip}} @ 7,000 rpm<ref name=VisorDown2002/> || {{convert|59.7|-|61.6|hp|abbr=on|order=flip}} @ 7,600 rpm<ref name=Canet2008/><ref name=Coe2010/> || {{convert|50|kW|abbr=on}} (claimed)<ref name=KTM/> || {{convert|51.5|kW|abbr=on}} (claimed)<ref name=KTM-R/> || {{convert|73|hp|abbr=on|order=flip}} (claimed)<ref name=firstride/> |- ! Torque |colspan="2"| {{convert|44|lbft|abbr=on|order=flip}} @ 5,500 rpm<ref name=VisorDown2002/> || {{convert|45.96|-|48.0|lbft|abbr=on|order=flip}} @ 5,425 rpm<ref name=Canet2008/><ref name=Coe2010/> || || {{convert|51.7|lbft|abbr=on|order=flip}}(claimed)<ref name=firstride/> ||{{convert|55|lbft|abbr=on|order=flip}}(claimed)<ref name=firstride/> |- ! Fuel consumption || || {{convert|15.4|km/L|abbr=on}}<ref name=VisorDown2002/> || {{convert|49.7|-|51|mpgus|abbr=on}}<ref name=Canet2008/><ref name=Coe2010/> || || || |- ! Top speed || {{convert|105|mph|abbr=on}} || {{convert|120|mph|abbr=on}}<ref name=VisorDown2002/> || {{convert|114|-|116.9|mph|abbr=on|order=flip}}<ref name=Canet2008/><ref name=Coe2010/> || || || |- ! {{convert|0|to|60|mph|abbr=on}} seconds || || 4.8<ref name=VisorDown2002/> || 3.6–3.92<ref name=Canet2008/><ref name=Coe2010/> || || || |- ! {{convert|0|to|1/4|mi|abbr=on}} || 13.1 @ {{convert|97|mph|abbr=on|order=flip}} || || 12.28 @ {{convert|104.65|mph|abbr=on|order=flip}}<ref name=Canet2008/><br>12.35 @ {{convert|101.96|mph|abbr=on|order=flip}}<ref name=Coe2010/>|| || || |- ! Braking {{convert|60|to|0|mph|abbr=on}} || {{convert|118|ft|abbr=on|order=flip}} || || {{convert|128.9|ft|abbr=on|order=flip}}<ref name=Coe2010/> || || || |} {{-}}
==Notes== {{Reflist|30em|refs= <ref name=CW1995>{{Citation |title= KTM Duke |magazine=Cycle World |volume= 34 |issue= 9 |date=September 1995 |page= 38 |publisher=Hachette Filipacchi {{Subscription required |via=General OneFile}} }}</ref>
<ref name=Connor2008>{{Citation |last= Conner |first= Blake |title= Solo performance |magazine= Cycle World |date= May 2008 |pages= 62–67 }}</ref>
<ref name=Canet2008>{{Citation |last= Canet |first= Don |title= Ducati Monster 696 vs KTM 690 Duke: one-two punch |magazine=Cycle World |date= August 2008 |pages= 46–52 }}</ref>
<!-- <ref name=SuperStreet2010>{{Citation |title= 2010 KTM 690 Duke R |magazine=Super Streetbike |date=April 2010 |page= 14 |publisher=Source Interlink Media {{Subscription required|via= General OneFile}} }}</ref> -->
<ref name=Brown2012>{{Citation |title= KTM 690 Duke: juvenile no more |first=Roland |last= Brown |magazine=Motorcyclist |date= April 2012 |page= 66 |publisher=Source Interlink Media |url=http://www.motorcyclistonline.com/firstrides/122_1204_ktm_690_duke_first_ride/ |accessdate= February 19, 2014 }}</ref>
<ref name=Coe2010>{{Citation |title= KTM's 690 Duke; Razor-edged styling with a personality to match |last= Coe |first= Danny |magazine= Motorcycle Consumer News |date= October 2010 |pages= 20–23 |url= http://www.mcnews.com/mcn/model_eval/2010OctKTMDuke.pdf |format= Adobe PDF |accessdate= February 19, 2014 |archive-date= May 15, 2012 |archive-url= https://web.archive.org/web/20120515125531/http://www.mcnews.com/mcn/model_eval/2010OctKTMDuke.pdf |url-status= dead }}</ref>
<ref name=KTM>{{Citation |url= http://www.ktm.com/gb/naked-bike/690-duke-ausuk/highlights.html |title= KTM 690 Duke |author= KTM |accessdate= February 19, 2014 |archive-date= February 14, 2014 |archive-url= https://web.archive.org/web/20140214060058/http://www.ktm.com/gb/naked-bike/690-duke-ausuk/highlights.html |url-status= dead }}</ref>
<ref name=KTM-R>{{Citation |url= http://www.ktm.com/gb/naked-bike/690-duke-r-ausuk/highlights.html#.UwUzul5RFGQ |title= KTM 690 Duke R |author= KTM |accessdate= February 19, 2014 |archive-date= February 15, 2014 |archive-url= https://web.archive.org/web/20140215025202/http://www.ktm.com/gb/naked-bike/690-duke-r-ausuk/highlights.html#.UwUzul5RFGQ |url-status= dead }}</ref>
<ref name=VisorDown2002>{{Citation |url= http://www.visordown.com/reviews/motorcycles/naked/ktm-duke-ii-640-2000---2006/specification/187.html |accessdate= February 20, 2014 |magazine=Visor Down |title= KTM Duke II 640 (2000 - 2006) |date= May 26, 2002 }}</ref>
}}
==References== {{Refbegin|30em}} *{{Citation |title= One motor, three very different motorcycles |magazine=Motorcyclist |date= May 2008 |page= 69 |publisher=Source Interlink Media |url= http://www.motorcyclistonline.com/firstrides/122_0805_ktm_690_duke_smc_enduro/ |accessdate= February 19, 2014 |last= Brown |first= Roland }} {{refend}}
==External links== {{Commons category|KTM 690 Duke}} {{Official website|http://www.ktm.com/in/ready-to-race.html}}
Duke 690 Category:Standard motorcycles Category:Single-cylinder motorcycles Category:Motorcycles introduced in 1994