Yamaha Genuine Cylinder Stud Bolt M8x204 5MX-E1391-00 Mio Sporty Soul Fino Nouvo

Yamaha Genuine long cylinder stud bolt for compatible Yamaha 115cc carburetor scooters. Also searched as cylinder-head stud, block stud, engine stud or “tusok-sate” bolt.

Product Specifications

• Brand: Yamaha Genuine Parts
• Part number: 5MX-E1391-00
• Official part name: Bolt, Stud 1
• Nominal size: M8 × 204 mm
• Overall length: Approximately 204 mm
• Design: Double-ended threaded stud
• Construction: Metal/steel
• Finish: Factory-plated metallic finish
• Application: Crankcase, cylinder block and cylinder-head assembly
• Country indicated on packaging: Made in Indonesia
• Available size: M8 × 204 mm only
• Quantity: 1 piece per order
• Fitment type: Model-specific; not universal

Compatible Yamaha Models

• Mio Sporty 115
• Mio Soul 115 carburetor
• Fino 115 carburetor
• Nouvo 115
• Nouvo Z

Compatibility may differ according to year and country. Confirm 5MX-E1391-00 using the motorcycle’s parts catalogue or the removed stud before ordering.

Quantity Reminder

Applicable engines normally use four cylinder studs. This listing contains one stud bolt only, as indicated on the package. Nuts, washers and the remaining three studs are not included.

Equivalent Size and Other Brands

Generic dimensional description:

• M8 cylinder/head stud
• Approximately 204 mm overall length
• Double-ended thread with unequal threaded-section lengths

No confirmed direct Honda, Suzuki or Kawasaki OEM equivalent is claimed. For an aftermarket replacement, all of the following must match:

• M8 thread diameter
• Exact thread pitch on both ends
• 204 mm overall length
• Threaded-section lengths
• Plain-shank diameter
• Material strength and heat treatment
• Surface plating

Do not replace it with ordinary M8 threaded rod. Regular hardware may have a different strength, thread engagement and unthreaded-shank design.

Not Compatible With

Do not assume compatibility with:

• Mio i125 / Soul i125
• Mio M3
• Mio Gear / Gravis
• Fazzio
• NMAX
• Aerox 155

These models use different engine platforms or stud-bolt part numbers. For reference, NMAX commonly uses 2DP-E1391-00, while Aerox 155 uses BB8-E1391-00.

Package Includes

• 1 × Yamaha Genuine Stud Bolt 1, 5MX-E1391-00

Cylinder block, cylinder head, nuts, washers, gaskets and installation tools are not included.

Professional installation is recommended. Follow the service-manual tightening sequence and torque specifications. Replace studs that are bent, stretched, heavily corroded or have damaged threads.