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Loading...What causes compression problems with a valve stuck open in a Honda CRF450R 2017?
If the valve is stuck open, leading to compression issues in your Honda Motorcycle, it could be due to a worn cylinder and piston (correct the ring), a damaged cylinder head gasket, improper valve timing, or a faulty decompressor system.
Why my Honda CRF450R 2017 Motorcycle pulls to one side?
If your Honda Motorcycle pulls to one side, it could be due to several reasons. The front and rear wheels might not be aligned, or there could be a bent fork, swingarm, axle shaft, or frame.
General| Engine Type | 449cc liquid-cooled single-cylinder four-stroke |
|---|---|
| Bore x Stroke | 96.0mm x 62.1mm |
| Compression Ratio | 13.5:1 |
| Induction | Programmed Fuel Injection (PGM-FI), 46mm throttle body |
| Transmission | Close-ratio five-speed |
| Final Drive | #520 Chain; 13T/49T |
| Rear Suspension | Pro-Link Showa single shock with spring preload, rebound and compression damping adjustability; 12.4 inches travel |
| Front Brake | Single 260mm disc with twin-piston caliper |
| Rear Brake | Single 240mm disc |
| Front Tire | 80/100-21 |
| Rear Tire | 120/80-19 |
| Trail | 116mm (4.6 inches) |
| Wheelbase | 58.3 inches |
| Seat Height | 37.8 inches |
| Valve Train | Unicam, 4-valve |
| Ignition | Full transistorized |
| Curb Weight | 243 pounds |
List of abbreviations used in the manual for technical terms and system names.
Section detailing safety information and recommendations for riding the CRF.
Key safety information and recommendations for safe riding.
Essential precautions to protect yourself when riding.
Information on installing non-Honda accessories or modifying the CRF.
Guidance on understanding and maintaining safety labels on the motorcycle.
Identifies the location of basic controls and components on the CRF.
Explanation of the Malfunction Indicator Lamp and its function.
Details the function and indication of the mode indicator light.
Guidance on rider readiness before operating the CRF.
Checks to ensure the motorcycle is prepared for riding.
Critical pre-ride checklist to ensure safety and proper function.
Essential precautions for safe operation of the motorcycle.
Procedures for starting and stopping the engine.
Instructions for the initial break-in period to ensure reliability.
Explanation of why regular maintenance is crucial for safety and performance.
Safety precautions to follow during maintenance procedures.
Recommended service intervals and tasks for maintaining the CRF.
Specific maintenance tasks tailored for competition use.
Information on spark plug inspection, replacement, and reading.
Procedures for changing engine oil and replacing the oil filter.
Instructions for inspecting, cleaning, and servicing the air cleaner.
Procedure for removing and installing the motorcycle seat.
Details on fuel tank removal, refueling, and inspection.
Procedure for checking the fuel line for damage or leaks.
Steps to safely relieve fuel pressure before servicing.
Instructions for replacing the fuel line.
Procedure for replacing the fuel pump filter.
Recommended engine oil type, viscosity, and standards.
Explanation of the JASO T 903 standard for motorcycle engine oils.
Procedure for checking and adding engine oil to the correct level.
Steps for draining and replacing engine oil and the oil filter.
Recommended coolant type and mixture for the cooling system.
Procedure for checking and adding coolant to the system.
Steps to inspect the cooling system for leaks and proper function.
Procedure for replacing the coolant in the system.
Instructions for cleaning the air cleaner element and housing.
Procedure for draining deposits from the crankcase breather tube.
Instructions for checking and adjusting throttle grip freeplay.
Procedure for adjusting throttle freeplay using the upper adjuster.
Procedure for adjusting throttle freeplay using the lower adjuster.
Procedure for adjusting the engine's idle speed.
Procedure for adjusting the clutch lever position.
Instructions for checking and adjusting clutch lever freeplay.
Procedure for adjusting clutch freeplay at the cable end.
Steps for removing clutch discs, plates, and related components.
Recommended spark plug types and heat ranges.
Procedure for inspecting and replacing the spark plug.
Steps for removing the cylinder head cover for inspection.
Procedure for measuring intake and exhaust valve clearances.
Steps for removing the camshaft for adjustment or replacement.
Procedure for installing the camshaft and related components.
Steps for removing the cylinder head assembly.
Procedure for removing the cylinder from the crankcase.
Steps for removing the piston from the cylinder.
Procedure for removing piston rings from the piston.
Procedure for installing the piston into the cylinder.
Steps for installing the cylinder onto the crankcase.
Procedure for removing the cam chain tensioner lifter.
Procedure for installing the cam chain tensioner lifter.
Inspection steps for the front suspension components.
Detailed steps for removing the front suspension forks.
Procedure for disassembling the fork outer tube.
Steps for changing the fork damper oil.
Procedure for disassembling the fork damper assembly.
Steps for assembling the fork damper assembly.
Steps for assembling the fork damper assembly.
Inspection steps for the rear suspension shock absorber.
Procedure for adjusting the front brake lever.
Steps to adjust the rear brake pedal height.
Checking brake fluid levels in the front and rear systems.
Procedure for checking the front brake fluid level.
Procedure for checking the rear brake fluid level.
Inspection and maintenance of wheel rims and spokes.
Inspection of axle shafts and wheel bearings.
Information on checking and adjusting tire air pressure.
Steps for inspecting tires for wear and damage.
Procedure for replacing a punctured or damaged tire tube.
Steps for inspecting the drive chain for wear and damage.
Inspection and replacement of drive chain sliders.
Inspection and replacement of drive chain rollers.
Procedure for adjusting drive chain slack and alignment.
Recommended method for lubricating the drive chain.
Checking mounting bolts and pipe condition for cracks or deformation.
Steps for removing the mufflers from the exhaust system.
Procedure for inspecting steering head bearings for roughness or play.
Checking the handlebar for bends, cracks, or proper positioning.
Maintenance and lubrication of control cables.
Torque values for various engine and frame fasteners.
General advice on cleaning and protecting the CRF's appearance.
Procedure for washing the motorcycle using mild cleaning agents.
How to change engine output characteristics using the mode select button.
Procedure for adjusting front suspension air pressure.
Adjusting compression and rebound damping for front suspension.
Information on optional fork springs for tuning.
Adjustment procedure for fork oil levels.
Procedure for adjusting rear suspension spring pre-load.
Adjusting high and low speed damping for rear suspension.
Procedure for measuring and setting race sag for optimal handling.
Suspension tuning recommendations for soft terrain.
Suspension tuning recommendations for hard terrain.
Guidelines for adjusting front suspension based on track conditions.
Troubleshooting and adjustments for stiff suspension symptoms.
Troubleshooting and adjustments for soft suspension symptoms.
Troubleshooting and adjustments for suspension bottoming issues.
Guidelines for adjusting rear suspension based on track conditions and symptoms.
How to interpret spark plug color for engine tuning.
Adjustments for rear end handling, traction, and stability.
Information on fork positioning in the clamps.
How wheelbase adjustments affect handling.
Effects of increasing gearing for top speed and reduced shifting.
Effects of decreasing gearing for acceleration and power.
Tire recommendations for hard and slick terrain.
Tire recommendations for muddy conditions.
Tire recommendations for loose and sandy terrain.
Adjusting lever and pedal positions for comfort and control.
Adjusting handlebar for optimal riding position.
Guidelines for safely transporting the CRF on a trailer or truck.
Procedures for preparing and storing the motorcycle for extended periods.
Tips for environmentally responsible motorcycle ownership and waste disposal.
Guide to diagnosing and resolving common engine and performance issues.
Information on VIN and engine serial number locations.
Key dimensions, capacities, and technical specifications for the CRF.
Torque values for various engine and frame fasteners.
Information on using oxygenated fuels and their compatibility.
Guidance on recording suspension, gearing, and tire settings.
Tips for recording race placings, performance thoughts, and strategy.
What to record for engine and suspension maintenance history.
List of optional frame parts and tools available from dealers.
List of recommended spare parts for events.
List of essential general tools for maintenance.
List of specialized Honda tools required for certain procedures.
List of recommended chemical products for maintenance.
List of other useful products for maintenance and care.
Information on obtaining service and owner's manuals.
How to contact Honda for support or feedback.
Information on dealer services and support.
Tips to prevent premature wear and costly repairs to the engine.
