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1987-1992 Suzuki LT250R Porting Instructions

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🏷️ Basic Information Identification Make: Suzuki Model: LT250R Quadracer Model Variant: Two-stroke sport ATV Production Years Covered: 1987-1992 👋 Introduction Market Position Target Audience: Experienced two-stroke engine builders and quad...
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Type: Atv
Forhandler:
Suzuki
Sku: 586410
Tags: 1987 1988 1989 1990 1991 1992 A Models Atv LT250R Motorcycles Suzuki
1987-1992 Suzuki LT250R Porting Instructions
🏷️ Basic Information
Identification
Make:
Suzuki
Model:
LT250R Quadracer
Model Variant:
Two-stroke sport ATV
Production Years Covered:
1987-1992
👋 Introduction
Market Position
Target Audience:
Experienced two-stroke engine builders and quad racers porting the LT250R for motocross or drag racing.
Competitive Advantage:
Model-specific porting measurements and procedures rather than generic two-stroke guidance.
Key Features
Content Type:
Step-by-step cylinder porting instructions with specifications
Focus:
Cylinder head and port modifications for increased two-stroke performance
📋 Manual Details
Product Details
Coverage Areas:
Cylinder porting and related two-stroke engine modification
Manual Type:
Performance porting instructions
Language:
English
Format:
PDF
Delivery Method:
Instant digital download
Binding:
Digital (PDF)
Notes
Page Count:
N/A - not specified for this document
📖 Manual Coverage
Systems Covered
Cylinder Porting:
Intake, transfer, and exhaust port modification procedures
Cylinder Head:
Squish band and combustion chamber preparation
Port Timing:
Port timing measurement and adjustment
Matching:
Port matching to gaskets and manifold surfaces
Cylinder Bore:
Bore condition and inspection guidance
Procedures Included
Disassembly:
Cylinder removal and preparation
Measuring:
Port measurement and timing calculations
Grinding:
Material removal techniques and tool use
Finishing:
Port surface finishing and deburring
Reassembly:
Verification and reinstallation steps
Technical Depth
Skill Level:
Advanced - intended for experienced engine builders
Detail Level:
Specific port dimensions and timing figures for the LT250R
Special Tools:
Die grinder, carbide bits, measuring tools, port timing degree wheel
Parts Information
Applicability:
Suzuki LT250R Quadracer 1987-1992 cylinders
Gaskets:
Guidance on cylinder base and head gasket selection
Part Numbers:
N/A - not specified in this document
📊 Manual Specifications
File & Compatibility
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print & Binding
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
⚙️ Engine Specifications
Engine
Primary Engine:
249cc liquid-cooled two-stroke single
Bore x Stroke:
67.0 mm x 59.0 mm
Cooling:
Liquid cooled
Lubrication:
Premix or oil injection depending on setup
Fuel System:
Mikuni flat-slide carburetor
Performance Notes
Output:
Porting intended to increase peak power over stock output
Compression:
Determined by head modification procedure in this document
🔧 Transmission
Transmission
Standard Transmission:
5-speed manual clutch gearbox
Final Drive:
Chain drive
Features
Clutch:
Wet multi-plate manual clutch
Relevance to Porting:
Stock transmission retained; document covers engine porting only
📐 Dimensions
Dimensions and Weight
Wheelbase:
Approximately 1,205 mm (47.4 in)
Curb Weight:
Approximately 179 kg (394 lb)
Length:
N/A - not specified in this document
🛡️ Safety Features
Safety Notes
Crash Test Information:
N/A - off-road ATV, not crash tested
Active Features:
None - rider-provided protective equipment assumed
Passive Features:
Engine kill switch
Workshop Safety:
Follow eye, ear, and respiratory protection when grinding cylinder
💡 Technology Features
Infotainment
Audio System:
N/A - off-road ATV, not equipped
Driver Assistance
Driver Assistance:
N/A - not applicable to this vehicle
🔧 Maintenance
Service Intervals
Piston and Rings:
Inspect at regular intervals; ported engines require frequent top-end checks
Coolant:
Check before each ride
Carburetor:
Re-jet after porting per instructions
Fluids
Fuel:
Premix gasoline and two-stroke oil at specified ratio
Transmission Oil:
Two-stroke gearbox oil, change per service schedule
Coolant:
Long-life ethylene glycol coolant
Common Wear Items
Piston Kit:
Frequent replacement item on ported two-strokes
Reeds:
Inspect reed valves; porting increases intake flow demands
Cylinder Wear:
Verify bore and port edges after each rebuild
📚 Vehicle History
Heritage
Manufacturer:
Suzuki Motor Corporation, Japan
Model Evolution:
LT250R Quadracer introduced in 1985 as Suzuki's first high-performance sport ATV; refined through 1992
Production Location:
Japan
🏆 Awards & Recognition
Recognition
Racing Legacy:
LT250R Quadracer was a dominant machine in early professional ATV motocross racing
Formal Awards:
N/A - not specified for this model
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