Aftermarket throttle governor spring, Link Rod, & Rod Spring Set for Honda GX340 GX390 Engines Includes 1) Governor Rod, Compatible with Honda Part # 16555-ZE3-000. 2) Governor /Speed Control Spring, Compatible with Honda Part # 16561-ZE3-000 & 16561-ZF6-D00. 3) Governor Rod/Fuel Throttle Return Spring, Compatible with Honda Part # 16562-ZE3-000 & 16562-ZE3-700.