Polaris Predator 50/90 & Sportsman 90 ATV Service Manual 2005 (P/N 9919532)

Polaris service manual P/N 9919532 covers the 2005 Predator 50, Predator 90, and Sportsman 90 youth ATVs, with model-specific maintenance, diagnostic, and repair information.

PDF Search, Navigation, and Page Count

Text search and wiring details: Service text supports PDF search, with embedded bookmarks for the five chapters, individual service topics, and the index. Wiring-diagram labels are image-based; rotate the diagrams and zoom in to read small wire codes and connector markings.

One printable PDF contains 113 pages total, including the two notes pages and rear cover.

Two-Stroke Engine, CVT, and Chassis Service

These are selected areas of coverage rather than a complete contents list. Other reference material includes paint codes and tap/drill charts.

• Maintenance and lubrication: Inspection schedules, pre-ride checks, compression testing, air-filter service, transmission lubrication, and oil-pump adjustment, bleeding, and troubleshooting.

• Engine repair: Step-by-step removal, crankcase separation, cylinder and piston inspection, reed-valve checks, cylinder honing, crankshaft runout inspection, and reassembly.

• CVT and transmission: Primary and secondary clutch service, belt inspection, separate Youth 50 and Youth 90 transmission procedures, and kick-start spring installation.

• Carburetor service: Sunworld H68K system operation, model-specific calibration, float-height adjustment, needle-and-seat leakage testing, oil check-valve testing, and mixture troubleshooting.

• Chassis and controls: Drum brakes, steering and toe alignment, A-arms, shocks, swing arm, rear axle, bearing carrier, chain setup, and body assemblies.

• Electrical diagnosis: Battery, charging, starter, ignition, coil/stator, and ETC tests, supported by diagnostic flowcharts and separate model-group wiring diagrams.

This manual suits technicians and experienced owners familiar with engine measurement and electrical testing; the maintenance chart reserves certain service tasks for authorized Polaris dealers.

Maintenance and Model-Specific References

The 50cc and 90cc machines use different carburetor calibration, cooling arrangements, suspension layouts, body-removal requirements, and transmission procedures. Those distinctions help match the planned work to the machine before disassembly.

General service information includes model, VIN, and serial-number identification, electronic and throttle-stop speed-control systems, and throttle-cable and Electronic Throttle Control (ETC) adjustment.

Specification tables provide approved lubricants, capacities, fastener torques, clearances, wear limits, and electrical test data. This is a service and repair publication rather than a parts catalog; its publication table identifies separate model-specific parts manuals for component ordering.

Engine Inspection and Reassembly

The engine chapter goes beyond routine maintenance, covering crankshaft removal, cylinder-head and cylinder inspection, piston and ring measurement, connecting-rod and reed-valve checks, cylinder honing, and crankshaft runout inspection. Reassembly instructions address the oil-pump drive, stator, flywheel, top end, starter wheel, and engine-mounted components.

Engine access: The Sportsman requires body-panel removal, while the Predator 50 requires removal of the riser and footrest. On the 50cc chassis, the rear engine bracket affects access, and the front engine mount also serves as a suspension pivot.

Tool references include the PA-45153 flywheel puller and 2870710 crankshaft alignment fixture.

CVT, Transmission, and Starting Drive

CVT service reaches the primary and secondary sheaves, cam plate, roller weights, drive belt, driven clutch cover and lining, and compression spring. The CVT System Exploded View identifies the assembly, including the retained 50cc primary-sheave spacer; handling notes explain how roller weights can fall out during cam-plate removal.

The Youth 90 section covers the shift drum, shift shaft, fork, dog-and-gear assembly, countershaft, output shaft, bearings, seals, and reassembly checks. Youth 50 coverage includes the main axle, drive-axle assembly, primary drive, cover, bearings, and seals, supported by the Drive Shaft (Transmission) Exploded View. Engine removal is required for internal Youth 50 transmission service.

Kick-start coverage includes spring installation. The starter one-way clutch contains small springs and pins that can dislodge, and heavy grease on its rollers can cause drive malfunction.

Carburetor Testing and Fuel Delivery

The fuel chapter separates 50cc and 90cc calibration data and explains the float, pilot, needle, slide, and main systems. It also includes optional main jets, a high-altitude discussion, vent-system checks, bowl draining, and lean, rich, and poor-idle troubleshooting.

Pressure-testing references identify the 2870975 Mity Vac tool; float adjustment references identify tool 2872314. These tests distinguish fuel-level and sealing problems from calibration issues.

Brakes, Steering, and Body Assemblies

Chassis coverage includes front and rear drum brakes, steering-post and tie-rod installation, swing arm, rear axle and bearing carrier, chain tension, fuel and oil tanks, and muffler mounting. Separate Predator and Sportsman cab and handlebar assemblies show the applicable mounting arrangements.

The Engine Mounting exploded view and separate 50cc and 90cc Suspension A-Arm views support component identification. Shock service references the 2870872 spanner wrench.

Incorrect tie-rod-end positioning during jam-nut tightening can make the joint bind and break. Brake, steering, fuel, battery, oil-injection, and rotating CVT work directly affect youth-ATV safety. Follow the factory warnings and have critical repairs verified by a qualified technician before the machine is returned to a child rider.

Charging, Starter, and Ignition Diagnosis

Battery coverage includes activation, open-circuit voltage and load testing, charging, and storage. The Charging System Testing flowchart connects battery condition with key-off current draw, break-even testing, alternator output, and regulator/rectifier diagnosis.

Starter coverage adds voltage-drop testing, a diagnostic flowchart, motor disassembly, brush inspection, armature testing, and reassembly. Ignition information covers ETC operation, coil/stator testing, and no-spark troubleshooting.

Separate wiring diagrams cover the Predator 50 and the Sportsman 90/Predator 90. The electrical notes also identify the Predator 50 parental-control ignition cutoff tether and explain that ignition timing is nonadjustable.

Piston-Fit and CVT Wear-Limit Examples

The engine-inspection section lists piston-to-cylinder clearance of .00138–.00177 in. (.035–.045 mm) for the Predator 50 and .00118–.00197 in. (.03–.05 mm) for the Predator 90/Sportsman 90.

For CVT belt inspection, the listed belt-width service limit is .626 in. (15.9 mm).