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In most cases as the valve seat and valve head wear they start to pocket into the head, This reduces the clearances ,if the clearance is reduced to nothing the valve is held open slightly,this reduces the compression of the engine and in turn it will be hard to start .If the valves are set tight to the point where NO lash in the valvetrain and PRELOAD (negative lash) is present, that is where valves do not fully seat at temperature and things go bad. The perfect balance is a smooth running engine with minimal valvetrain noise.Tight valves can easily make your bike hard to start, it can even prevent it from starting at all. Make sure that the feeler gauge fits easily between the tappet and valve.
What happens if engine valves are to tight?
If the valves are set tight to the point where NO lash in the valvetrain and PRELOAD (negative lash) is present, that is where valves do not fully seat at temperature and things go bad. The perfect balance is a smooth running engine with minimal valvetrain noise.
Will tight valves cause no start?
Tight valves can easily make your bike hard to start, it can even prevent it from starting at all. Make sure that the feeler gauge fits easily between the tappet and valve.
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Do engine valves get tighter or looser?
Valves almost always get tighter.
What happen if tappet tight?
On the other hand, if the tappet adjustment is too tight, the valves can stay open slightly too long, meaning much more heat is transferred through to it than it’s designed to handle which can cause chips and cracks in the valve.
What happens when valves are out of adjustment?
Too much clearance means the valves will likely clatter and, over the long term, cause damage to the valves, camshaft lobes or rocker arms. If there’s too little valve clearance, the valves won’t fully close, causing excessive heat, and the engine will lose power.
Can valves cause ATV not to start?
ATV Won’t Start
Hot start problems are often caused by valve lash issues. As the engine reaches operating temperature, lash tolerances change. If the valves are too tight, they may remain open, which will reduce cylinder compression. An engine without compression won’t start.
Can tight valves cause low compression?
This has to do with valve overlap and timing. Tight valves open up sooner, open up wider, and stay open longer, which too tight can lower compression and burn exhaust valves; compression loss due to valve not seating quick enough on the compression stroke.
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When the exhaust valves get too tight they will also cause hard starting and eventually get hot enough to start melting – not pretty.
Do valves get tighter or looser when hot?
If the engine is running hot, the clearance of the exhaust valve will be tighter.
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Do valves tighten when hot?
For an engine with cast-iron heads and steel valves, you can expect the lash to tighten up a couple of thousandths of an inch as it heats up-so for the cold lash you would set the valve lash a couple thousandths larger than the cam manufacturer’s recommended hot lash setting.
Do intake valves get looser?
As always, looser is safer than tighter. I have been for several years now setting my intakes at . 004 and exhaust at . 009 they never move and the aluminum expands more than the steel, so they do get looser hot.
What does a sticking valve sound like?
Symptoms. Valve sticking will typically manifest as a clicking noise that regularly occurs every two to three seconds at idle. This noise may be especially pronounced at start-up when the engine is cold. The clicking will most likely increase in frequency with as the engine rpm increases, but may or may not get louder.
What happens if tappet are not adjusted?
The temperature of the exhaust will increase. In some scenarios, the valve could stay open for an extending period of time, causing decrease in the engine’s compression pressure. If this happens you may notice exhaust valve gets burn, and a spike in turbocharger fouling.
What may cause damage to valve stem?
Valve stem damage – New tires typically come with new valve stems, because the old ones tend to wear out. If you have older valve stems, they may go bad over time, due to use, dislocation, and exposure to chemicals on the road, such as road salt. They may corrode and go bad.
What is a tight valve?
A tight valve means greater stress on the heart and less blood to the body. The body needs blood to survive and the heart is responsible for pumping blood around the body. The main pumping chamber of the heart is called the left ventricle.
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Does valve adjustment affect timing?
The valve’s duration (the time the valve is open) will therefore be greater if the clearance is tighter (it opens sooner and closes later), and reduced if it’s looser (opens later and closes sooner). This has a direct effect on engine performance.
How do you know if you need a valve job?
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.
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