Malossi 185cc Cylinder Kit with CDI for Yamaha S-Max 155

Malossi 185cc Racing Cylinder Kit with Forcemaster CDI Controller for Yamaha SMAX 155. M3115707


Bore 63 mm
Stroke 58.7 mm
Displacement 183
Compression ratio: 10.6:1
Material: primary aluminium alloy with a high content of hardened and tempered silicon, cylinder liner with silicon carbide coating in a galvanic nickel die and crossed smoothing with two diamond passages with very limited tolerances
Machining: on machine tools with high precision numerical control
Cylinder-piston connection with an allowance of 0.05 mm
Recalculated and upgraded heat exchange surfaces


Ultra compact with 3 rings
Material: special aluminium alloy with high silicon content, low thermal expansion and a tin facing on the sliding surfaces
Machining on machine tools with numerical control
Lightened and reinforced
Upgraded heat exchange surfaces

Piston rings

Special rings with high sliding ease and very high mechanical resistance
I° ring compression in nitrided and chromium steel
II° special cast iron ring Three - piece scraper ring made of chromium-plated special steel alloy


Carburation adjusting
± 20% at min/medium/max
RPM limiter: + 1000 RPM
4 different maps already built in

This product is intended solely for competition-sports usage. No warranty, express or implied, is offered.
Please read our shipping and returns policy prior to ordering.  We do not accept returns, replacements or exchanges on this item. 
  • Model: 3115707