Two Stroke Power Valves Explained

How two stroke power valves work.

Category:

Autos & Vehicles

Tags:

• engine
• two
• start
• stroke
• engines
• power
• valves
• exhaust
• port
• ports
• motor
• gas
• oil
• valve
• powers
• machine
• dirt
• bike
• small
• 80cc
• 125cc
• 250cc
• honda
• suzuki
• yamaha

[OTAlucard]

holding in the back pressure for more power in the lower rpms i think

[pimpinpenz]

@OTAlucard Yeah so it doesnt waste as much fuel aswell. because of the scavenging problem as well eh

[rc4wd101]

wat nitro rc car you got i can see the glow starter

[pimpinpenz]

@rc4wd101 traxxas revo 3.3 and a shit exceed and for electric i got a losi 1/10 scale desert truck.

[vasiliskoutras]

1:56 nice sound man...

[cayeaj1]

thanks for the vid, helped me understand very easily ;)

[stockylivesforfmx]

yeah thanks helped alot;)

[ry4n98654]

@MrGazmcfaz use amsoil interceptor i used it on my rm 125 and it cleaned them up and they work now

[keithalexander36]

Exhaust port timing is what the power valve changes. Nothing more.

[keithalexander36]

Modmotoman

[MrGazmcfaz]

thats very helpful, I was looking at completely the wrong bit inside the cylinder. I took my bike to a garage for a service, they said they cleaned the powervalve, but the bike still isnt opening up to max rpms like it did before, the valve feels like it's sticking. Do you know if the valves inside the cylinder can be cleaned out without taking the cylinder off? As in, take off the exhaust, push something inside the cylinder and clean the valves off allowing them to move more freely?

[ENTRIS1]

@willmc11 you can but it offers a wide range of power. a 'powerband' is more noticible on a two stroke becuase it fires every down stroke. the power valve makes it so you dont just have power in one area you have it in low mid and top end. the old bikes dont have them so its way more noticible

[TheISLANDMONKEYS]

@willmc11 not enough back pressure for the engine to run!

[AgentMi6]

I thought it was to do with fluid dynamics and pulse preasure, eg.. when the engine is at lower RPM, you dont want most of your air/fuel mix being scavanged through cylander and out the exhaust with not enough of a pulse wave to compress it back in with such a massive expension chamber. So the valve restricts the scavanging to basicly ensure the right compressed air/fuel ratio in the cylander to maximise tourqe. I could be wrong eh..