yes there is a spring, and it tends to go flying when u pop the decomp off. took me 10 min to find mine the first time i did it. im sure its there for a reason, so i wouldnt run without it. dont you have 2 stock cams? get the spring off the other one, or go buy a comparable spring.
08 Honda 700xx
11.0:1 CP Piston || +3 Throttle Body by Cuervo Racing || Web 290 Cam
HD Web Valve Springs || Hard Rockers || NGK BKR6EKPB-11 Laser Platinum spark plug
Modquad Air Flow System with K&N Filter || custom mounted trail tech vapor || Modified air box lid
DMC Afterburner full exhaust || EBC Dirt Racer Clutch Kit w/Cuervo Racing springs || PC3
Rear 22" Kenda Kutter XC tires || Rear 22" ITP Sand Star tires
Dyno Tuned by Cuervo Racing @ 53.82rwhp & 44tq