OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Victa Two Stroke Engines New Decompession Valve?

On a recent trip to magnet mart, i noticed this decompression valve on one of the chinese Victa's, it was only on the base model (Lawnkeeper) the higher ones (Tornado, etc) had the sealed powertorque deco valve i revognise.

Anyone know what the go is with this? why make something new, and only put it on the base line, or is the local store just behind on a few models?





Also, the carby now has a grey cap?


Are these changes in any way significant?

I am thinking somone has stuffed up in the factory, they look like a decompressor for an old school full crank victa, I wouldnt know why they would make them bigger like that since it would cost them more in metal and getting new tooling equipment to make them.

Its possible, stem is quite different though, and the head was smaller than any decompression valve i have seen on a victa, flat on the bottom too, not cupped like the others.

just can't see a good reason for it, maybe it was indeed an error, or maybe they are just trying to look like they have made a change.

if anything in my opinion its made it look even cheaper cand crappier, I bet a new powertoruqe would not even last 5 years, an old one if looked after will go for many times that....

Here Here, still running an original Vortex, which will easily see another 20 years of these crappy things left as rubbish behind it!

Spotted another one today, got some clearer pics too!

The post is actually one solid piece!






However, the mower next to it still had the one i expected it to

That long piece of hexagonal steel looks like a brute-force move to keep the decompressor from being wrecked by the occasional lateral blow (like, from a boot when the crummy thing wouldn't start) or from a resonant vibration while the engine is running. It is probably an improvement, though at a considerable cost in weight.

I'm not so sure Grumpy, the previous design was physically quite resilient, as the short stem did not allow it to bent or snap easily.

The biggest issue I have encountered is build up inside the stem causing the poppet inside to jam open, and therefore destroying compression, I would imagine adding a longer stem would only increase the chances of this happening, and make it harder to deal with when it does, further, the head is smaller, and would likely become gunked up much faster.

I would imagine a good kick to this valve would cause it to bent or break along one of those ribs on the shaft.

The inly advantage i could imagine to this, is the smaller head may make the valve more responsive to the vacuum feed, and more reliable until it became gunked up or damaged.

Then again, I have not had the chance to see inside this one!

Ty those 3 parting-tool grooves in the hexagonal spacer/valve mounting are quite shallow, and would not have a significant effect on its strength or rigidity, which would still be quite extreme. My guess would be they were put there to make it prettier.

I thought it might have been a case of stacks on with some male to female connectors.

Bob, it seems unlikely the hexagonal bits would line up so precisely if that were the case. It would also be a remarkably expensive way to make a spacer.

The stem was definatly one peice, I made sure to pay attention to that this time, the head is also much smaller, and flat underneath the seal.

I wasnt serious about the stacks on

I see the different shape of the diaphragm bowl now that its mentioned.


I would assume that its something that might solve itself over time.

Who knows, I've only ever seen it twice now, and both times on the same model, no other 2-stroke I have seen has it.