Heavy Hitter 520 Primary Drive Conversion OEM/EBMX Ultra Motors

Want race-proven performance? The Heavy Hitter 520 Primary Drive Conversion Kit is the EBMX FIM E-Xplorer race team's choice—ridden by Jack Field & Jess Gardiner. If it’s tough enough for them, it’s tough enough for your ride!

This is the lightest kit on the market, designed for maximum power transfer and minimal resistance. Less rotational mass means quicker acceleration, and less resistance means more efficiency.

Why Choose Heavy Hitter?

💥 Hybrid Sprocket Setup – A 7075 T6 Billet aluminum rear sprocket with a hardened, counter-cut steel front sprocket for strength without extra weight.
💥 Race-Tuned for Performance – This non-o-ring Fire Power 520 Japanese chain delivers the least rotational resistance possible.
💥 No Rubber Gimmicks – We don’t vulcanize rubber onto the sprockets because it steals power, traps debris, and accelerates wear. This kit is built for performance, not silence.

🚨 Heads Up! This isn’t a stealth kit—expect some noise. But hey, fast bikes make fast sounds!

🔥 Features:

✅ Exclusive Dished Sprocket Design – Ensures proper clearance for a smooth ride.
✅ 520 Non-Sealed Japanese Chain – Built for long-term reliability & reduced rotating mass.
✅ 7075 Aluminum Rear Sprocket – Lightweight yet tough enough for serious riding.
✅ Heat-Treated Counter Cut Steel Front Sprocket – Boosts durability while keeping things light.
✅ Master Link Chain – Easy swaps when it’s time for maintenance.

⚡ Dominate the trails with the same setup as the pros! If you want raw performance, this is your kit. No compromises. No wasted power. Just speed. 🔥🏆