What is the recommended valve clearance?

What is the recommended valve clearance?

Opinions may vary between piston and valve manufacturers, but a popular consensus is a minimum clearance of . 080-inch for the intake and . 100-inch for the exhaust. The exhaust valve expands more due to heat from combustion, and therefore needs additional clearance.

What are valve clearances?

What are valve clearances? Valve clearances on motorcycle and car engines effectively relate to the gap between the top of the valve stem and the cam that operates it. The inlet valves in the engine open to allow air and fuel into the cylinder, while the exhaust valves let the burnt gases out.

What is a valve lash?

Valve lash is the available clearance (or gap) between the rocker arm and the tip of the valve stem when the lifter for that valve is sitting on the base circle of the cam lobe (when the valve is intended to be fully closed). But on a solid cam and lifter setup, lash is a very big deal because it must be set manually.

What tool do you use to measure valve clearance?

A critical tool to measuring valve clearance is a set of feeler gauges. Since the engine is going to be partially opened up and exposed, it is best to work on a clean machine.

How are valve lash measured?

Valve lash is measured with a feeler gauge between the tappet adjusting screw and the end of the valve stem. A feeler gauge measurement is either a go or no-go. To adjust valve lash, loosen the locknut (10mm), and turn the tappet adjusting screw until the drag on the feeler gauge is correct.

How do you calculate valve lash?

To determine the valve lash, subtract the squish from the desired valve opening lift. The cam in the graph is for a flathead, using squish of 0.002″ the valve lash should be 0.0127″ or 0.013″. The exhaust could be set a couple thousandths larger to allow for thermal expansion.

What is valve lash?

What is the valve clearance Briggs and Stratton?

Step 3: Check the valve clearance by placing a feeler gauge between the valve head and the rocker arm. Clearances differ for the two valves and typically range from . 002 – . 004″ to .