Description

The Yamaha SX190 1800 HO Master Engine Rebuild Kit +.25mm is built for engines that show cylinder wear but do not require a full +.50mm overbore. This kit restores proper clearances while maintaining factory-style compression and reliability.

Rather than piecing together individual components, this master kit supplies matched internal parts designed to work together during assembly. As a result, builders can focus on accuracy and longevity instead of parts compatibility.

THIS KIT INCLUDES

• Crankshaft – 6S5-11411-01-00
• Cam chain – 94591-66152-00
• Cam chain damper guide – 6BH-12251-00-00
• Cam chain tension guide – 6BH-12252-00-00
• Cam chain upper guide – 6BH-12241-00-00
• Complete gasket kit – 6CR-W0001-01-00, 6CS-W0001-01-00, 6HM-W0001-00-00, 6HM-W0001-01-00
• Oversize +.25mm piston kits – 6BH-11631-00-B0
• Connecting rods – 6BH-11650-10-00
• Connecting rod bearings (black) – 6S5-11656-50-00
• Crankshaft bearings (green) – 6S5-11416-40-00
• Intake valves – 6S5-12111-00-00
• Exhaust valves – 6S5-12121-00-00
• Intake camshaft – 6BH-12171-10-00
• Exhaust camshaft – 6BH-12181-10-00
• Camshaft gears – 6D3-12176-10-00, 90105-07004-00

BUILD NOTES

• Designed specifically for +.25mm oversize piston applications
• Ideal when cylinders clean up with a light overbore
• Components selected for proper oil control and valvetrain timing

WARRANTY & SUPPORT

The REV6 parts warranty backs all components. For coverage details, review our
warranty policy. If you have questions about bore sizing or machine work, visit our
FAQ page or
contact our team before ordering.

FITMENT

Yamaha SX190 1800 HO
2013–2015

TAKE ACTION
If your SX190 engine needs a controlled oversize rebuild without jumping to +.50mm, this +.25mm master kit delivers the right balance of correction and longevity. Ships nationwide—order now and rebuild with confidence.

Veterans and servicemembers qualify for exclusive REV6 savings—thank you for your service.