Yanmar Engine - JH4 Series
Redesigned cylinder block and new combustion system. Produces 25% more torque with only a 10% increase in displacement. Lower running speed and less vibration reduce noise by five decibels. Complies with EPA Tier 2 emmissions. This series includes the following engines:
| Engine | HP | Years In Production | Comments |
| 3JH4 | 39 | 2004 - Present | |
| 3JH4E | 40 | Summer 2004 - Present | |
| 4JH4E | 55 | Summer 2004 - Present |