Maximize the power potential of your GY6 big-bore build with the TFC Special S-1 High Angle Camshaft. Designed specifically for engines running 58.5mm to 63mm cylinder bores, the S-1 delivers 6mm of valve lift � significantly more than a stock cam � keeping the valves open longer and pushing them further to pull in more air and fuel on every stroke. The result is stronger mid-range and top-end power that a big bore cylinder alone can't fully unlock without a matching cam upgrade.
This is the cam to run when you've already installed a big bore kit and want to extract the full power it's capable of. Pairs well with a high-flow head, performance exhaust, and upjetted carburetor.
Designed for GY6 QMI/QMJ 152/157 (125cc/150cc) 4-stroke engines running big bore cylinders from 58.5mm to 63mm. Not recommended for stock 57mm bore engines � the aggressive lift profile is optimized for larger displacement builds.
Build Tip: The S-1 cam works best paired with a big bore cylinder (61mm�63mm), a high-flow or big valve head, performance exhaust, and an upjetted carburetor. Running a high-lift cam on a stock head with stock jetting will limit gains and may cause a lean condition at high RPM.
This product is intended for off-road use only and is not legal for use in California on pollution-controlled vehicles. Check local laws before installing. Performance upgrades are not covered by warranty.
California Prop 65 Warning: www.p65warnings.ca.gov
