Why You Should Fear The Devil Spring | KTM Red Power Valve Spring Install 

I just swap out to the red spring on my 250 XC from the stock spring. I ran the stock spring for the first year and a half. I will definitely say there is a huge difference with the red spring the power comes in like an 250sx. My first bike was three years ago and was an 06 YZ250 so I'm used to the power hitting hard. I'm glad I got the YZ is my first bike. I will most definitely say I really like the red spring and I will be leaving it in. I will say I love this spring.

Just had a play on a 300 tryed all springs back to back 100% throw the orthers away run the red

Hey so a big part of the power valve is not so much the size of the port opening but the timing of the opening relative to the piston. When it closes off it opens later which means the reflected waves in the expansion chamber happen at the right time. This needs to change because the engine is moving slower. Other than that its a great and informative video!

If I adjusted my PV I would make it have as much power as possible everywhere, optimized for max torque at any given RPM no matter what the pipe would then give as the final result, no need to give less power than the bike can deliver :)

LOL. Got to go get me the devil spring!! Fellow KTM 300 owner - although antique 2004!

My bike came with a KTM binder, inside that binder was a yellow spring.... After watching this I removed my power valve tensioner just to verify that I have a 2nd yellow spring. I was worried that is why my bike is so "twitchy" but no it is just twitchy because it has so much power.

Cool video. Curious as to how the green spring would do on technical stuff.

When i changed my springs out i had about 125ml of oil come out is this normal?

Anyone know where you cam get opd oem stickers? I got a 2010 250exc 2stroke and looking for some

What graphics do u have on that and can u please drop a link tia

I throughly enjoy your content. I do like the different projects but the Chinese buggy is my favorite. I've always wanted to see someone make one of those handle and run good. Keep it up.

Hey man where can l buy this spring ?

If you ride on water, don't use the Devil spring, use the Jesus spring, he loves you, he loves you and he needs money.

Jesus needs nothing.