Originally Posted by BikeBerryJen
From my knowledge, the newer engines no longer require that spring and simply don't come with them any more.
I never heard about that, could be. But like I said, ya don't really need it and runs fine without it. Ocho Ninja got one a couple years ago without the spring. Back then it was probably an oversite at that high tech chinese factory. He ran it for a long time like that, No problems.