I just got a jawa 210 from the '90's started up after a lot of work and it idles just fine. But when I give it any juice it bogs down and dies, even when it is on the center stand. I've tried adjusting the carburetor every which way. If I play around with the choke while its at full throttle I can get it to not die, but I have to constantly adjust the choke accordingly. Does anybody have any ideas of how to fix this?