|Advanced Valve Train Technology
For Kart & Jr. Dragster RacingIf you have any questions concerning installation or proper use of your new Go-Parts™ products, call us toll-free at 1-800-976-9376. Cam cards and application sheets are also available by calling Go-Parts™' tech line toll-free at 1-800-976-9376. IMPORTANT: Take the time to make sure that your camshaft is installed and clearanced properly.
Go-Parts™ Extended Lifter Installation Instructions For Briggs & Stratton™ 5 HP EnginesThe installation of a high lift camshaft will cause the lifter heads to make contact with the bottom of the block's lifter bore area if material has not been removed. These steps will guide you through the process of removing interfering material from the engine block to create the necassary clearance.Go-Parts™ extended lifters are designed for use in Briggs and Stratton™ 5 HP modified Kart and Jr. Dragster racing engines. These one piece precision lifters are CNC machined from high grade tool steel. They are 0.100" longer than the Briggs and Stratton stock lifters for high lift, small base circle camshafts. Go-Parts™ extended lifters are available in a 1.000" head diameter for limited modified engines and 0.950" head diameter for long stroke and/or long connecting rod engines.Note: Remember that your goal is a hi-performance racing engine, it is in your best interest to follow these instructions. By not following these simple steps, you may reduce horsepower, efficiency, and the performance of your engine.We will assume at this point that you have disassembled the engine. Make sure to use proper eye-protection.Install the Go-Parts™ extended lifters and high lift camshaft dry. Slowly turn the camshaft over until the intake or exhaust lifter contacts the bottom of the lifter bore area of the block. Determine the amount of material that needs to be removed from the block to clearance your new lifters.
Tip: To obtain a good view of the lifter bore area, look through the Go-Parts™ billet cam gear with a flashlight.Remove the camshaft and lifters. Remove the desired amount of material from the bottom of the lifter bore area using a grinder with porting tools or with a valve seat cutter (with the cutter inverted).Use compressed air to blow debris from the engine, and clean any metallic residue.Re-install the camshaft and lifters to check for clearance. Remove more material if necassary, but only enough to provide clearance. Reinstall the crankcase cover and gasket, then torque bolts to the required setting. Slowly rotate the engine by hand to insure that no internal components are touching. Listen closely for noise as you rotate the engine. Perform any other necessary maintenance to your engine, thoroughly clean, lubricate and reassemble the engine. On long stroke and connecting rod engines, use the Go-Parts™ 0.950" head diameter lifter . Always be sure to double check all clearance of internal components before firing the engine. Once you have the necessary clearance, you will want to set the valve lash .If you can't get the desired clearance, call us toll-free at 1-800-976-9376 for assistance.