Before turning a single wrench, you must know the exact tolerances and specifications of your bike. Below are the critical baseline specs typically found in the MT-15 workshop manual: Specification 155cc, Liquid-cooled, 4-stroke, SOHC, 4-valve with VVA Bore x Stroke 58.0 mm × 58.7 mm Compression Ratio Engine Oil Capacity
The MT-15 uses a chain drive final transmission, which requires regular adjustment and lubrication. An improperly adjusted chain is a safety hazard. The official manual provides a specific method for checking slack.
An improperly tensioned chain destroys sprockets and saps engine power. Yamaha Mt 15 Service Manual
Performing regular checks and services at the correct intervals is the foundation of motorcycle ownership. Here are three of the most critical procedures you can handle with the help of the manual.
The ( official model code MTN155 ) is the primary technical resource for maintaining your bike's performance. For major updates like the 2022 model, you may also need a Supplementary Service Manual (code BKJ-F8197-E0 ) to cover specific changes like ABS or electrical updates. Key Service Intervals Before turning a single wrench, you must know
Guessing bolt tightness can strip threads in the aluminum engine block. Using the manual's exact torque specifications eliminates this risk.
One of the most technically demanding tasks on the MT-15 is adjusting the . This is a precision job that involves opening the engine, measuring the gap between the valves and rocker arms, and replacing shims to adjust it to the exact specification. The SOHC 4-valve engine has a specific valve clearance tolerance that must be maintained for optimal performance and to prevent engine damage. This work is highly specialized; a professional mechanic will perform a "dynamic inspection using Yamaha diagnostic tool" and check for error codes during a major service. The official manual provides a specific method for
Remove the three bolts securing the oil filter cover on the right side of the engine. Pull out the old filter.