Fit For NC250 Camshaft Stop Plate Cylinder Head For Zongshen ZS177MM 250cc Bike Fit Secure Engine Timing camshaft stop plate exclusively matched Fit For Zongshen NC250 ZS177MM 250cc For dirt bike cylinder head assemblies Thickened plate locks camshaft in position to eliminate axial play abnormal engine tick noise Accurate cutouts align with cylinder head mounting holes for stable bolt-on installation vibration construction maintains fixed cam timing under RPM racing trail riding loads Direct OEM replacement to resolve loose camshaft, timing deviation collision risks during engine overhaul