KTM 2011 Off-Road Bikes Arrive in June

By
Ron Lieback
-

2011 Models

KTM introduces its 2011 off-road lineup to dealerships in June, meeting the anticipation created by the 350 SX-F thanks to a win by Jagermeister KTM rider Mike Alessi at the opening round of the Lucas Oil AMA Pro Motocross Championship at the Hangtown Classic.

While some may be been skeptical that a 350 can run with 450s, the 350 SX-F earned 4-1 moto finishes with Alessi aboard, placing him second overall. The 350 SX-F was also the first-ever 350cc cycle in the MX1 World Championship, where Antonio "Tony" Cairoli won the premier race.

The new-size four-stroke–recalling the early years of two-strokes in motocross when open bikes were often 351cc–was developed by ten-time MX World Champion Stefan Everts, with the goal offering the performance of a 450cc with the agility of a 250cc MX bike.

The 350 SX-F, along with every other SX-F model, features linked rear suspension system, rather than the linkage-less shock PDS suspension associated with KTM. The 2011 two-stroke (SX) models still retain PDS.

The 350 SX-F also features a Keihin fuel injection system with a 42mm throttle body and a Keihin engine management system, and an electric start, although the bike can be retrofitted with a kickstarter.

The 350 SX-F is one of six MX models for 2011: the SX (two-stroke) models, the 125 SX, the 150 SX and 250 SX, and the SX-F (four stroke) models, the 250 SX-F, the 350 SX-F and the 450 SX-F.

As for the SX-F models, the 250 and 350 have the new fuel injection, but the 450 retains the 41mm Keihin carburetor. All SX-F models also get 48mm WP fork up front.

Both the SX and SX-F models have redesigned, stiffer framework, with the only differences arriving from the PDS vs. the linked suspension mounting holes.

As for the two-stroke SX models, all will retain PDS suspension and Keihin carburetors. The 150 and 250 SX models also have the following upgrades:

> New cylinder with improved casting

> New exhaust pipe with increased wall thickness for more resistance against damage

> New radiator cap for better heat stability

> Entirely new KTM-patented triple-clamp design that includes a 22mm fixed off-set and overall design improvements for improved flex characteristics and optimal handling.

> Modified air box with a new shape that helps reduce dirt and water collection and new TwinAir filter

> New brake pads for more progressive feel

> New Renthal Diamond handgrips

The 150 SX transmission also received a reinforced 1st gear for durability, and the frame is redesigned with a steeper steering head angle for easier cornering and a better feeling in the front end.

2011 KTM 125 SX

Engine type

Single cylinder, 2-stroke

Displacement

124.8 cc

Bore x stroke

54 x 54.5 mm (2.13 x 2.15")

Starter

Kickstarter

Transmission

6 gears

Carburetor

Keihin PWK 38S AG

Control

Exhaust control

Lubrication

Mixture oil lubrication 1:40

Transmission oil

Motorex, SAE 15W50

Primary drive

23:73

Final drive

13:50

Cooling

Liquid cooling

Clutch

Wet multi-disc clutch, operated hydraulically

Ignition

Kokusan

Frame

Central double-cradle-type 25CrMo4

Subframe

Aluminum

Handlebar

Renthal, Aluminum Ø 28/22 mm (1.10/0.87")

Front suspension

WP USD Ø 48 mm (1.89")

Rear suspension

WP PDS shock absorber

Suspension travel front/rear

300/336 mm

Brakes, front/rear

Disc brakes 260/220 mm (10.24/8.66")

Rims, front/rear

1.60 x 21"; 2.15 x 19" Excel

Tires, front/rear

80/100-21"; 100/90-19"

Chain

5/8 x 1/4"

Main silencer

Aluminum

Steering head angle

63.5°

Wheel base

1480±10 mm

Ground clearance (unloaded)

385 mm

Seat height

992 mm

Tank capacity

approx. 7,5 liters

Weight (no fuel)

approx. 88.8 kg

2011 KTM 150 SX

Engine type

Single cylinder, 2-stroke

Displacement

143.6 cc

Bore x stroke

56 x 58.4 mm (2.20 x 2.30")

Starter

Kickstarter

Transmission

6 Gears

Carburetor

Keihin PWK 38S AG

Control

Exhaust control

Lubrication

Mixture oil lubrication 1:40

Transmission oil

Motorex, SAE 15W50

Primary drive

23:73

Final drive

14:50

Cooling

Liquid cooling

Clutch

Wet multi-disc clutch, operated hydraulically

Ignition

Kokusan

Frame

Central double-cradle-type 25CrMo4

Subframe

Aluminum

Handlebar

Renthal, Aluminum Ø 28/22 mm (1.10/0.87")

Front suspension

WP USD Ø 48 mm (1.89")

Rear suspension

WP PDS shock absorber

Suspension travel front/rear

300/336 mm

Brakes, front/rear

Disc brakes 260/220 mm (10.24/8.66")

Rims, front/rear

1,60 x 21"; 2,15 x 19" Excel

Tires, front/rear

80/100-21"; 100/90-19"

Chain

5/8 x 1/4"

Main silencer

Aluminum

Steering head angle

63.5°

Wheel base

1480±10 mm

Ground clearance (unloaded)

385 mm

Seat height

992 mm

Tank capacity

approx. 7,5 Liter

Weight (no fuel)

approx. 88.8 kg

2011 KTM 250 SX

Engine type

Single cylinder, 2-stroke

Displacement

249 cc

Bore x stroke

66.4 x 72 mm (2.61 x 2.83")

Starter

Kickstarter

Transmission

5 gears

Carburetor

Keihin PWK 36S AG

Control

TVC power valve

Lubrication

Mixture oil lubrication 1:60

Transmission oil

Motorex, SAE 15W50

Primary drive

26:72

Final drive

13:48

Cooling

Liquid cooling

Clutch

Wet multi-disc clutch, operated hydraulically

Ignition

Kokusan

Frame

Central double-cradle-type 25CrMo4

Subframe

Aluminum

Handlebar

Renthal, Aluminum Ø 28/22 mm (1.10/0.87")

Front suspension

WP USD Ø 48 mm (1.89")

Rear suspension

WP PDS shock absorber

Suspension travel front/rear

300/335 mm (11.81/13.19")

Brakes, front/rear

Disc brakes 260/220 mm (10.24/8.66")

Rims, front/rear

1.60 x 21"; 2.15 x 19" Excel

Tires, front/rear

80/100-21"; 110/90-19"

Chain

5/8 x 1/4"

Main silencer

Aluminum

Steering head angle

63.5°

Wheel base

1475±10 mm (58.07 ± 0.39")

Ground clearance (unloaded)

385 mm (15.16")

Seat height

985 mm (38.78")

Tank capacity

approx. 8 liters (2.11 gal)

Weight (no fuel)

approx. 95.4 kg (208 lbs)

2011 KTM 250 SX-F

Engine type

Single cylinder, 4-stroke

Displacement

248.6 cc

Bore x stroke

76 x 54.8 mm (2.99 x 2.16")

Compression ratio

13.2:1

Starter

Kickstarter

Transmission

6 gears

Carburetor

Keihin EFI, throttle body 42 mm

Control

4 V/DOHC with finger followers

Lubrication

Pressure lubrication with 2 oil pumps

Engine lubrication

Motorex, SAE 10W50

Primary drive

22:68

Final drive

13:48

Cooling

Liquid cooled

Clutch

Wet multi-disc clutch, operated hydraulically

Ignition

Keihin EMS

Frame

Central double-cradle-type 25CrMo4

Subframe

Aluminum

Handlebar

Renthal, Aluminum Ø 28/22 mm (1.10/0.87")

Front suspension

WP USD Ø 48 mm (1.89")

Rear suspension

WP-Monoshock with linkage

Suspension travel front/rear

300/330 mm

Brakes, front/rear

Disc brakes 260/220 mm (10.24/8.66")

Rims, front/rear

1.60 x 21"; 2.15 x 19" Excel

Tires, front/rear

80/100-21"; 100/90-19"

Chain

5/8 x 1/4"

Main silencer

Aluminum

Steering head angle

63.5°

Wheel base

1495±10 mm

Ground clearance (unloaded)

375 mm

Seat height

992 mm

Tank capacity

approx. 7.5 liters

Weight (no fuel)

approx. 99.9 kg

2011 KTM 350 SX-F

Engine type

Single cylinder, 4-stroke

Displacement

349.7 cc

Bore x stroke

88/57.5 mm

Compression ratio

13.5:1

Starter

Electric starter/12V 3 Ah

Transmission

5 gears

Carburetor

Keihin EFI, throttle body 42 mm

Control

4 V/DOHC with finger followers

Lubrication

Pressure lubrication with 2 oil pumps

Engine lubrication

Motorex, SAE 10W50

Primary drive

24:73

Final drive

14:50

Cooling

Liquid cooled

Clutch

Wet multi-disc clutch, operated hydraulically

Ignition

Keihin EMS

Frame

Central double-cradle-type 25CrMo4

Subframe

Aluminum

Handlebar

Renthal, Aluminum Ø 28/22 mm (1.10/0.87")

Front suspension

WP USD Ø 48 mm (1.89")

Rear suspension

WP-Monoshock with linkage

Suspension travel front/rear

300/330 mm

Brakes, front/rear

Disc brakes 260/220 mm (10.24/8.66")

Rims, front/rear

1.60 x 21"; 2.15 x 19" Excel

Tires, front/rear

80/100-21"; 110/90-19"

Chain

5/8 x 1/4"

Main silencer

Aluminum

Steering head angle

63.5°

Wheel base

1495±10 mm

Ground clearance (unloaded)

375 mm

Seat height

992 mm

Tank capacity

approx. 7.5 liters

Weight (no fuel)

approx. 103.9 kg

2011 KTM 450 SX-F

Engine type

Single cylinder, 4-stroke

Displacement

449.3 cc

Bore x stroke

97 x 60,8 mm (3.82 x 2.39")

Compression ratio

12.5:1

Starter

Electric starter/12V 3 Ah

Transmission

5 gears

Carburetor

Keihin FCR MX 41

Control

4 V/DOHC with finger followers

Lubrication

Pressure lubrication with 3 oil pumps

Engine lubrication

Motorex, SAE 10W50

Primary drive

29:74

Final drive

14:52

Cooling

Liquid cooling

Clutch

Wet multi-disc clutch, operated hydraulically

Ignition

Kokusan

Frame

Central double-cradle-type 25CrMo4

Subframe

Aluminum

Handlebar

Renthal, Aluminum Ø 28/22 mm

Front suspension

WP-USD Ø 48 mm (1.89")

Rear suspension

WP PDS shock absorber

Suspension travel front/rear

300/330 mm

Brakes, front/rear

Disc brakes 260/220 mm (10.24/8.66")

Rims, front/rear

1.6 x 21"; 2.15 x 19" Excel

Tires, front/rear

80/100-21"; 110/90-19"

Chain

5/8 x 1/4"

Main silencer

Aluminum

Steering head angle

63,5°

Wheel base

1495±10 mm

Ground clearance (unloaded)

371 mm

Seat height

992 mm

Tank capacity

approx. 7.5 liters

Weight (no fuel)

approx. 106.9 kg

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Ron Lieback
Ron Lieback
One of the few moto journalists based on the East Coast, Ron Lieback joined the motorcycle industry as a freelancer in 2007, and is currently Online Editor at Ultimate Motorcycling. He is also the author of "365 to Vision: Modern Writer's Guide (How to Produce More Quality Writing in Less Time).

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