- 1). Place the engine with the top deck facing down so that the camshaft can be inserted into the engine. Line up the timing indicators on the engine block and slide the cam shaft into the engine without hitting the camshaft on internal parts or the at the entrance opening. The camshaft must be seated without any defect. Any internal blemish can result in a poor performing engine which is vulnerable to engine failure during competition.
- 2). Secure the side plate cover that protects the internal cam shaft and crankshaft openings. Use a gasket and fastener bolts to secure it back in place. Line up the holes in the gasket so that you can see all the openings through the cover plate at the same time. Start all the bolts and tighten evenly in a cross over pattern that will insure the gasket is set evenly. Having a good seal here will make the engine internals safe from outside debris. Use silicon gel to make a better seal when using a gasket to join two metal parts together.
- 3). Turn the engine so that the cylinder head and valve covers are easy to install. Attach the cylinder head to the engine block using the cylinder head bolts and fasteners. Use a high quality gasket to help seat the head onto the engine. Be sure to use a torque wrench for the appropriate tightness to prevent over tightening these important engine fasteners. Use a thin film of liquid silicon on both engine and cylinder head before matching the two together and securing the bolts. This improves the durability of the gasket that is in between the engine and the cylinder heads.
- 4). Insert the valves and valve springs. Racing valve springs will require a spring compressor for removal and installation. Fasten the compressed spring around the valve and release the spring to seat properly in place. Check for valve alignment and proper seating to get the highest performance from a 5 horsepower Briggs racing motor valve spring. Line up the valve cover gasket and valve cover and secure to the cylinder head with fastener bolts. Tighten all the engine fasteners correctly to prevent stress fractures and worn threads on important engine components. Recheck these fasteners after testing the engine at temperature (warmed up).
- 5). Attach the clutch and clutch guard, the carburetor and gas tank using the mounting hardware that matches to the parts on the racing motor. Factory or performance parts will have bracket mounts or fasten directly to anchor points on the engine block. Tighten these parts tight enough not to become loose. Connect fuel lines from the tank to the carburetor using hose clamps or metal tubing with fittings instead of hose. Insert a spark plug, blower housing and exhaust to learn how to properly build a 5 horsepower Briggs racing motor from camshaft up.
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