Robin Subaru V-Twin cylinder series engines

V-Twin cylinder series engines have an improved overhead valve configuration that boosts power and efficiency, the company says. A new rocker-assembly design reduces maintenance requirements over the life of the engine. A teflon oil seal was added on the intake valve to reduce long-term oil consumption and increase lift. An improved fin design increases the cooling capacity at the heads. The four-cycle gasoline engine series ranges from 18 to 25 hp.