Kymco Maxxer Mongoose 250, Mongoose 300, MXER 250R ATV Repair Manual

Technical Scope and Service Documentation for 2005 Kymco Maxxer and Mongoose ATV

• Covers 2005 Kymco Maxxer and Mongoose 250 and 300 models, including the MXER 250R variant, featuring detailed specifications for 249 cc and 270 cc liquid-cooled powerplants
• Official KWANG YANG Motor Co., Ltd. First Edition publication 4122-ATV250-S00, June 2005
• Contains 20 distinct system chapters with over 100 exploded-view component illustrations, torque sequence tables, and electrical harness routing schematics
• Delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Suitable for printing individual sections for shop-floor use
• Stored against your account so you can retrieve it after a hard-drive loss
• This 2005 first edition provides the primary technical data for the original 250 and 300 engine series build, including all cooling system and frame maintenance parameters

Component and System Documentation

The 2005 Kymco Maxxer and Mongoose 250/300 service publication organizes technical data into a structured 20-chapter format. Initial segments document frame cover removal, exhaust muffler servicing, and periodic inspection requirements including valve clearance adjustment, air cleaner maintenance, and drive chain slack settings. Subsequent engine chapters detail the cylinder head, camshaft holder, piston, and lubrication systems, while final sections provide comprehensive electrical schematics and starter system diagnostic charts for both displacement variants.

Specification Highlights and Technical Data

This document provides high-depth technical reference values for identifying engine and chassis state. Cylinder compression for the 250 and 300 models is documented at 16 kg/cm² (1600 kPa, 227 psi). The valve clearance for both intake and exhaust on these models is specified at 0.1 mm (0.004 in) in the cold engine state. Gear oil capacity is listed as 300 cc for a standard change, while the transmission and cooling system capacities are indexed for service-floor accuracy.

Reference only — always consult a certified technician before performing service on this equipment.

An official 100-page Kymco OEM workshop manual covering the 2005 Kymco Maxxer and Mongoose 250/300, documenting engine, chassis, electrical, and fuel-delivery specifications for the 4122-ATV250-S00 build.