KTM 2012 250 SX-F User Manual

KTM 2012 250 SX-F

33 pages

To Next Page

To Next Page

Page #1 background image

Loading...

Page #1 background image

In-Depth Engine and Fuel

System Maintenance and

Repair Manual

2012 KTM 250 SX-F

Questions and Answers:

A
Amanda LeeJul 27, 2025
Why does my KTM Motorcycle speed up slowly or sputter when accelerating?
- B
  Benjamin EvansJul 27, 2025
  Your KTM Motorcycle might be speeding up slowly or sputtering due to several reasons. It could be a dirty fuel filter, in which case you should replace it. Another cause might be a faulty fuel injector, which also requires replacement. Bad fuel can also lead to this issue; you should empty the fuel tank and refill it with new unleaded ethanol-free gas. A loss of fuel pressure or a bad fuel pump could be the culprit, so check fuel hoses for loose fittings and possible leaks and test the fuel pump. Finally, an ECU issue might be the cause, suggesting a replacement of the ECU or taking the existing ECU to a KTM dealership for re-mapping.
R
Robin JimenezAug 11, 2025
Why is my KTM 2012 250 SX-F Motorcycle engine rattling?
- R
  rcruzAug 11, 2025
  If your KTM Motorcycle engine is rattling, several issues could be the cause. It might be due to improper valve clearance, which means you should adjust the valves. Another potential reason is that the engine timing is off, requiring you to adjust the timing. Additionally, excess piston wear could be the problem, suggesting you replace the piston and rings. Finally, excess rod bearing wear might be the cause, so you should check the crank rod bearings.

KTM 2012 250 SX-F Specifications

General

Engine Type	Single cylinder, 4-stroke
Displacement	249.91 cc
Starter	Electric starter
Transmission	5-speed
Cooling	Liquid cooled
Rear Suspension	WP Monoshock
Fuel Tank Capacity	7.5 liters
Compression Ratio	12.8:1
Bore x Stroke	76 mm x 54.8 mm
Fuel System	Keihin EFI
Frame	Central double-cradle type 25CrMo4 steel
Front Suspension	WP USD 48 mm
Front Brake	260 mm disc
Rear Brake	220 mm disc
Seat Height	992 mm
Ground Clearance	375 mm

Summary

Introduction

Troubleshooting: Fuel System

Troubleshooting: Engine

Common Maintenance and Repairs: Fuel System

Replacing the Fuel Filter

Step-by-step instructions for replacing the fuel filter on the 2012 KTM 250 SX-F.

Changing the Fuel Injector

Procedure for removing and installing a new fuel injector for the 2012 KTM 250 SX-F.

Replacing the ECU

Guide to removing and replacing the Electronic Control Unit (ECU) on the 2012 KTM 250 SX-F.

Testing the Fuel Pump

Steps to test the functionality of the fuel pump and determine if replacement is needed.

Common Maintenance and Repairs: Engine

Checking Valve Clearance

Procedure to check the valve clearance using a feeler gauge on the 2012 KTM 250 SX-F.

Changing the Piston

Detailed steps for removing and replacing the piston in the 2012 KTM 250 SX-F engine.

Checking the Cylinder for Wear and Damage

Guide on how to inspect the cylinder for wear and damage, including measurement procedures.

Checking the Crank Rod Bearings for Wear

Procedure to inspect the crank rod bearings for wear and play in the 2012 KTM 250 SX-F.

Checking the Main Crank Bearings for Wear

Steps to check the main crank bearings for wear and smooth rotation.

Checking and Setting the Timing

Instructions for verifying and adjusting the engine timing on the 2012 KTM 250 SX-F.

Technical Data: Engine Tightening Torques

Bibliography

Index

Related product manuals

KTM 250 XC-F EU 2012

Preview: KTM 250 SX-F 2016

KTM 250 SX-F 2016

KTM 250 SX-F 2011

Preview: KTM 250 SX-F 2017

KTM 250 SX-F 2017

KTM 250 SX-F 2019

Preview: KTM 250 SX-F 2018

KTM 250 SX-F 2018

KTM 250 SX-F EU 2010

KTM 250 SX-F EU 2015

KTM 250 SX-F EU 2017

KTM 250 SX-F USA 2010