Hot Rods – ATV, including crankshafts, connecting rod kits, bottom end kits, counter balancer kits, main bearing and seal kits, transmission and engine bearings and water pump kits for machines like the Yamaha Banshee 350, Honda TRX 400EX, Kawasaki KFX 450R and Polaris ACE 900. Quad engines get abused in a way street engines never do: full throttle, no airflow at low speed, mud and water in the cases, and a rider who lands hard on the pipe. That kills rod bearings, wipes crank journals and destroys water pump seals long before the top end wears out. Hot Rods builds forged cranks and rod kits to tighter tolerances than the stock parts they replace, so a rebuilt bottom end holds together under the same abuse. A complete kit puts crank, rod, bearings and seals in fresh together, instead of a new rod spinning on tired mains. A quad with a solid bottom end pulls cleanly, idles without a rattle and stops shedding metal into the transmission. Everything here is listed by year and model, and internals are model specific. Tell us your year, make and model and we will confirm the right part before you order.