What does a poppet valve do on a Yamaha outboard?
From what I’ve read, it has to do with water pressure vs. water volume. The poppet valve opens up when the temp gets high enough, allowing more water to get to the engine.
How do I know if my poppet valve is bad?
Symptoms of a bad poppet, if stuck “closed” would typically be an overheat at mid/lower rpms (and wot of course, but would be apparent at lower rpms as well). If stuck “open” you might have a crappy idle, hard start/cold start. Your symptoms are not “typical” of a poppet issue.
Can I run my outboard without a poppet valve?
The poppet valve reduces the pressure so the cooling systems preforms properly. If you see a leak from the poppet valve cover, there is a leak between the inner and outer plates or the poppet diaphram is bad (not expensive) Do not, as others may suggest, run the engine without a poppet valve or thermostats.
What does a poppet valve do on an outboard engine?
Poppet valve functions on WATER PRESSURE. On this engine, the spring provides (approximately) 7.5 psi tension. As pressure exceeds the spring tension, the valve opens.
Where is the poppet valve on a Yamaha?
The location of the Poppet Valve is on the back of the engine, between the cylinder banks down on the bottom on the engine below the Wire Loom.
Why is my Yamaha outboard overheating?
The most common cause of outboard motor overheating is water pump failure. Lack of raw water flow and lack of fresh water can cause water pump failure. Check for lack of raw water flow by noting the temperature of the outlet side of the system.
Is it OK to run outboard without thermostat?
Yes, you can temporarily run your outboard without the thermostat and not harm the engine. No, you can not remove the thermostat and continue running the engine for long periods of time without causing harm to the engine.
Where is the poppet valve located?
Where is the poppet valve?
Poppet valves are used in most reciprocating engines to open and close the intake and exhaust ports in the cylinder head. The valve is usually a flat disk of metal with a long rod known as the “valve stem” attached to one side. In early internal combustion engines (c.