Can you run a 2 stroke without a reed valve?
No, they won’t run without reeds. As for backfiring through the carburetor, very unlikely unless there was something like a glowing piece of carbon somewhere in the cylinder to light the fuel/air charge before the piston closed the intake port.
Do all two-stroke engines have reed valves?
Since a bad reed valve can be the cause of a variety of problems, knowing if you even have these can be useful – not all 2 stroke engines use reed valves. If it just “dumps” into crankcase, like diametrically opposite cylinder, most likely it’s got a reed-valve.
Are reed valves necessary?
Without reed valves, it would be impossible to create and use the depressions created by the piston in its stroke and, therefore, effectively “transport” the air/petrol mixture into the combustion chamber.
Why do 2 stroke engines most always have a reed valve?
Reed valve allows the mixture to move in only one direction – from the carburetor to the crankcase. It prevents the mixture from moving back to the carburetor. In the effect reed valve improves reloading of the combustion chamber with fresh air-fuel mixture. This improves power output of modern two stroke engines.
Does every two-stroke have Reeds?
Not all 2 strokes have reeds. Some have reeds, some are piston ported, and some have reed assist. Piston ported has holes on the top and bottom of the cylinders and as the piston moves up and down it “opens” & “closes” the extake & intake ports.
Will bad reeds cause no start?
If the petals break off, the engine may not run or start, depending on how much of the petals is missing. However, do not assume that if you have an engine that will not idle or has an erratic idle that the reed valve needs service. The usual cause of that the carburetor needs a rebuild.
Do chainsaws have reed valves?
Most chainsaws, especially those that are considered high- end versions, do indeed have reed valves. The reason that so many chainsaws have these small pieces of equipment is to allow them to perform with superior operation.
What happens when a reed valve goes bad?
Failing reed valves can result in reduced power at what should be cruising speeds. However, failing reed valves reduces the fuel and air mixture. This results in fuel being dumped into the carburetor with no flame to ignite it. The result is reduced power.
Will a bad reed valve cause a no start?
What running problems can reed valves cause?
If the reed valves are cracked, they may not open all the way, which will reduce the amount of oxygen that gets into the engine to mix with the fuel. The result is a rough idling engine that sounds like it is on the verge of dying.
Do Stihl chainsaws have reed valves?
Most STIHL products are of the piston port design. The 1120 series saw such as a model 009 and the 1132 series saw such as a model MS 191 are reed valve design engines. STIHL only builds piston port design engines at this time.