What is the valve clearance on a 400ex?
The exhaust valves should have . 005 inches of clearance, and the intake valves should have . 004 inches of clearance.
How do you clean the carburetor on a Honda Foreman?
Remove the black plastic cover on the side of the carburetor by unscrewing it. Unscrew the plastic nut from the carb and pull the choke cable out. Once the choke cable is out, the carb heater will unplug at the wiring harness. After the following steps, the carb should come off easily with just a few pulls and turns.
How do you adjust valves on a Honda?
Adjust the valve by turning the bolt clockwise with a flat head screwdriver. It needs to be tight enough to create just a small amount of drag on the feeler gauge. After you adjust it, tighten the nut and move on to Step 4.
How do you know if you 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.
Is a valve job necessary?
A valve job is simply a re-cutting or “re-facing” of the valve seats, and sometimes the valves. Valve jobs are necessary when the seats are worn to the point that there is no longer a proper seal between the seat and the valve. By re-facing the seats and/or valves, the proper seal is re-established.
How much does a valve adjustment cost at Honda?
Yes, you do have to adjust the valves, Steve. And $150 to $200 is the right price. This is a problem that seems to be unique to Honda: Honda’s valves have a tendency to get too tight.
Does valve adjustment improve gas mileage?
Replace your plugs, wires, distributor cap and rotor, adjust your valves, replace/clean your air filter, throw in some fuel injector cleaner, and you will see a significant increase in gas mileage. And even if it does not for some miracle, it’s not going to hurt your car anyways, but only allow it to run better.
How do I know if my valves are 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.