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KTM 85 SX - User Manual

KTM 85 SX
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KTM-Sportmotorcycle AG
A–5230 Mattighofen
www.ktm.com
KTM Group Partner
4/2007 FOTO: MITTERBAUER
85 SX, XC
105 SX, XC
OWNER’S MANUAL 2008
3211224en
*3211224en*
3211224en

Table of Contents

Other manuals for KTM 85 SX

Preview: Setup Instructions
Setup Instructions21 pages

Questions and Answers

  • J
    Justin LittleAug 19, 2025
    Why does my KTM Motorcycle engine have not enough power?
    • R
      robertsonpaulSep 12, 2025
      If your KTM Motorcycle engine lacks power, several factors could be responsible. The glass fiber yarn in the silencer might be charred, the air filter could be obstructed, the fuel supply may be partly interrupted, or there could be a loss of compression due to a loose spark plug. Damage to the exhaust system or insufficient preignition could also be the cause. To address this, replace the silencer filling, clean or replace the air filter, blow through the fuel pipe and clean the carburetor, tighten the spark plug, check the exhaust system for damage, and check and adjust the ignition.
  • K
    kyle49Aug 22, 2025
    What to do if KTM 85 SX engine is overheating?
    • M
      Megan SuttonAug 22, 2025
      If your KTM Motorcycle engine is overheating, it could be due to insufficient liquid in the cooling system, clogged radiator fins, frothing in the cooling system, pinched water hoses, incorrect ignition timing because of loose stator screws or an incorrect compression ratio. To resolve this, top up the coolant and bleed the cooling system, checking for leaks. Clean the radiator fins with a water jet, renew the coolant using a branded anti-freeze/anti-corrosive, replace any incorrectly routed hoses, readjust the ignition timing and secure the screws, and measure and adjust the compression ratio.
  • M
    Mary GentryAug 25, 2025
    Why is my KTM 85 SX engine spluttering into the carburetor?
    • P
      pterryAug 26, 2025
      If your KTM Motorcycle engine is spluttering into the carburetor, it could be due to a lack of fuel, a spark plug with an incorrect heat value causing ignition by incandescence, or the engine taking in air uncontrollably. To fix this, clean the fuel pipes, examine the tank aeration, and clean it. Also, fit the correct spark plug and check the intake flange and carburetor to ensure they are firmly secured.
  • A
    Abigail KellyAug 27, 2025
    What causes a KTM Motorcycle engine to not rev up and run in a four stroke cycle?
    • M
      mitchellmarieAug 28, 2025
      If your KTM Motorcycle engine revs aren't up and it's running in a four-stroke cycle, the carburetor may be overflowing due to a level that's adjusted too high, a dirty or enlarged float needle seating, or loose carburetor jets. Clean the carburetor, and if necessary, replace the float needle and adjust the level. Also, tighten the jets.
  • D
    dtrevinoAug 30, 2025
    Why KTM Motorcycle engine without idle running?
    • R
      Ryan HernandezAug 30, 2025
      If your KTM Motorcycle engine is not running smoothly at idle, it may be due to an improperly adjusted idle screw, damage to the ignition system, or general wear. Readjust the idle running or replace the idle adjusting screw. Also, examine the ignition system and consider overhauling the engine.
  • C
    calvin38Sep 2, 2025
    What causes high rpm misfiring in a KTM 85 SX?
    • K
      Karen CarrollSep 2, 2025
      If your KTM Motorcycle engine is misfiring at high RPM, it could be due to an incorrect heat range spark plug or a low-quality spark plug, or a loose, corroded, or non-conductive ignition socket connector. Refer to the technical data section for the correct spark plug and check and seal the ignition socket connector with silicon.
  • A
    Anna SchneiderSep 5, 2025
    What to do if KTM 85 SX engine has not enough power because of reed valves?
    • R
      Ryan PrattSep 5, 2025
      If your KTM Motorcycle engine lacks power and has reed paddles that are tensionless or damaged, or if the surface of the reed valve housing is damaged, you should replace the reed paddles or the reed valve housing. Also, consider overhauling the engine due to wear.
  • J
    John TorresSep 7, 2025
    Why is my KTM 85 SX emitting white smoke (steam)?
    • F
      Felicia WilliamsSep 7, 2025
      If white smoke (steam) is emitting from your KTM Motorcycle, it indicates a leak in the cylinder head or O-ring of the cylinder head gasket. You should check the cylinder head and replace the O-ring.
  • J
    Joshua SpencerSep 10, 2025
    Why is excessive oil escaping from the transmission breather tube on my KTM Motorcycle?
    • T
      Tonya RodriguezSep 10, 2025
      If excessive oil is escaping from the transmission breather tube of your KTM Motorcycle, it is likely due to an excessive quantity of oil in the transmission. Correct the transmission oil level to resolve this issue.
  • L
    Lori Gutierrez DVMSep 12, 2025
    How to fix water in transmission oil of KTM Motorcycle?
    • M
      Molly GatesSep 12, 2025
      If there is water in the transmission oil of your KTM Motorcycle, it is likely due to a defect in the shaft seal ring of the water pump. Replace the shaft seal ring of the water pump to fix this issue.

Summary

IMPORTANT INFORMATION

SERVICE

Proper service and maintenance are crucial for faultless operation and avoiding premature wear.

WARRANTY

SAFETY

Parents must ensure the motorcycle is in good working order and used on safe terrains.

IMPORTANT INFORMATION FOR PARENTS ABOUT SAFE DRIVING

OPERATION INSTRUMENTS

Damping action during compression of shock absorber

Controls compression damping in low and high-speed ranges.

Rebound damping function of the shock absorber

Adjusts the damping rate during rebound.

GENERAL TIPS AND WARNINGS FOR STARTING THE MOTORCYCLE

Instructions for the first ride

Guidance on initial checks, familiarization, and riding techniques.

Running in

Procedure for breaking in the engine during the first 30 minutes.

DRIVING INSTRUCTIONS

Pre-ride checks

Essential checks (engine, fuel, chain, tires, brakes, cables, coolant) before each ride.

Starting when the engine is cold

Steps for starting the motorcycle when the engine is cold.

Starting when the engine is warm

Shifting;Riding

Braking

Techniques and precautions for braking.

Refueling, fuel

Instructions and warnings for refueling the motorcycle.

MAINTENANCE WORK ON CHASSIS AND ENGINE

Checking and adjusting the steering head bearing *

Procedure to check and adjust the steering head bearing for play.

Changing the spring preloading of the shock absorber

Basic suspension setup for the weight of the driver

Adjusting suspension based on rider weight for optimal handling.

Checking the shock absorber and spring

How to check if the shock absorber spring is suitable for rider weight.

Determining the static sag of the shock absorber

Determining the riding sag of the shock absorber

Checking the basic setup of the telescopic fork

Checking chain tension

How to check and adjust the chain tension.

Correct chain tension

Checking the brake fluid level; refilling *

How to check and refill brake fluid.

Checking front brake pads

Replacing the front brake pads *

Procedure for replacing front brake pads.

Checking the rear brake fluid level

Refilling the rear brake fluid reservoir *

Procedure to refill the rear brake fluid reservoir.

Checking rear brake pads

Dismounting and mounting the front wheel

Steps for removing and installing the front wheel.

Dismounting and mounting the rear wheel

Steps for removing and installing the rear wheel.

Tires, air pressure

Cleaning the air filter *

Procedure for cleaning the air filter.

Checking the oil level of the hydraulic clutch

Bleeding of the hydraulic clutch

Procedure for bleeding the hydraulic clutch system.

Cooling system

Information about the cooling system, coolant, and potential hazards.

Checking coolant level

Refilling;Bleeding the cooling system

Procedure for refilling and bleeding the cooling system.

Draining the float chamber of the carburetor

Checking gear oil level

How to check the gear oil level.

Changing gear oil *

Procedure for changing the gear oil.

General information about KTM disc brakes

BRAKE DISCS

TROUBLE SHOOTING

Engine fails to start

Causes and remedies for starting problems.

Engine without idle running

Causes and remedies for lack of idle running.

Engine has not enough power

Causes and remedies for reduced engine power.

Engine revs not up and running in four stroke cycle

Causes and remedies for engine not revving properly.

High rpm misfiring

Engine splutters into the carburetor

Engine overheating

Causes and remedies for engine overheating.

STORAGE

TECHNICAL SPECIFICATIONS - CHASSIS

TIGHTENING TORQUES - CHASSIS

TECHNICAL SPECIFICATIONS - ENGINE

BASIC CARBURETOR SETTING

TIGHTENING TORQUES - ENGINE

CARBURETOR SETTING

KTM 85 SX Specifications

General IconGeneral
Engine Type1-cylinder, 2-stroke engine
Displacement84.9 cm³
StarterKickstarter
Transmission6-speed
CoolingLiquid cooled
Front BrakeDisc brake
Rear BrakeDisc brake
Weight (without fuel)68 kg
Front Brake Diameter240 mm
Rear Brake Diameter220 mm
Front SuspensionWP XACT USD, 43 mm
Fuel Tank Capacity5.2 l
Front Tire70/100-17
Rear Tire90/100-14
Bore x Stroke47 x 48.95 mm
Wheelbase1, 290 ± 10 mm

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