What tools do I need for a valve adjustment?

To adjust the valves, you’ll need a large flathead screwdriver, the correct size wrench to loosen the locknuts on the valve, and the appropriate feeler gauge to measure the gap between the valve stem and the rocker arm.

What tool is used to check valves?

Simply use a feeler gauge and slide the tab of the correct thickness between the tip of the valve stem and the end of the rocker. The camshaft manufacturer or your engine builder will give you the preferred lash range-it’s usually between 0.010- and 0.024-inch for a race engine.

How much does a valve adjustment cost?

Between $246 and $336 is the average cost of a valve adjustment. The labor costs are between $220 and $278 while the parts cost between $26 and $58.

How long does it take to do a valve adjustment?

Pros bill for half an hour to an hour. If you haven’t done it before it’s going to take you longer than 20/45 minutes. The time going to vary based on how many are out of spec. If you have to adjust all 16 it’s going to take you longer than if you only have to do 2.

What is a GY6 150cc engine?

The GY6 engine design is a four-stroke single-cylinder in a near horizontal orientation that is used on a number of small motorcycles or scooters made in Taiwan, China, and other southeast Asian countries. It has since become a generic technology.

What happens if valves are not adjusted?

The valves in your engine open and close through a complex, precisely timed system. They open to accept fuel into the cylinder, close to form compression and open again to release exhaust. Without an adjustment, they may not open and close efficiently, reducing your car’s overall performance.

How do I know I need a valve adjustment?

When do I need to have a valve adjustment? You should have your valve lash inspected at manufacturers recommended intervals. A sure sign that it’s time for a valve lash adjustment is if your engine is making a loud clicking or tapping noise when starting up or if you experience a loss in engine power.

What happens when valves are out of adjustment?

Too much or too little valve clearance can result in poor performance or a rough idle because the engine can’t “breathe” normally and operate at peak efficiency. If there’s too little valve clearance, the valves won’t fully close, causing excessive heat, and the engine will lose power.

What’s the best way to adjust a GY6 valve?

Tighten the tappet while moving the feeler gauge back and forth until you can feel a slight drag on the feeler. Then carefully re-tighten the locking nut. You may need a set of pliers to keep the head of the tappet from turning. Repeat for the remaining valve. Check your work! It’s important now to recheck the lash of each valve.

What does the Lash mean on a GY6 engine?

Valve “lash” is the technical name for the gap between the valve and tappet. The lash is critical to a healthy running engine. Too little lash and you’ll see starting problems and reliability issues. Too much lash will reduce power and potentially ruin the valve. If you’ve just replaced the camshaft, make sure it’s properly timed .

Where is the feeler gauge on a GY6 valve?

Loosen the tappet locking nut on the top of the tappet and turn the tappet out several turns. Sandwich the 0.004″ feeler gauge between the bottom of the tappet and the top of the valve. Tighten the tappet while moving the feeler gauge back and forth until you can feel a slight drag on the feeler. Then carefully re-tighten the locking nut.