Tighten the set screws on the Uni-Hub, drum and bearings. Weld a bent 3/8-inch rod to the frame so it crosses in front of the brake drum to anchor the brake band. Slide the Uni-Hub along the axle to align the axle sprocket with the clutch sprocket. Add a clutch to the engine crankshaft using set screws in the clutch hub. Weld a mounting plate to the rear center of the frame, and bolt the engine to it. 5.) Engineīuy accessories together with the engine to ensure compatibility. (Expect to adjust the axle parts again.) On the axle ends, mount wheel hubs, fit rear tires onto the rims and bolt the rims to the wheel hubs. Wedge bearings between a pair of bearing cassettes and use the hardware in a bearing kit to fasten the cassettes to both hangers. Center the sprocket, Uni-Hub and brake drum on the axle. Weld bearing hangers to the bottom face of the frame's 10-inch rear legs. Erd adjusted the positions of the steering shaft and tie rods until the steering performed properly. Mount the front tires on rims and bolt the rims to the hubs. Thread each bracket's stub axle into the front wheels' hubs. Bolt the tie rods' opposite ends to the brackets' arms and connect the rods to both ends.
Weld spindle brackets to the front corners of the frame. Bolt a pair of spherical rod ends to the steering arm at the bottom of the shaft, using nylock nuts. Screw the steering wheel to the steering shaft and thread the shaft assembly through the upper and lower blocks. Weld the lower steering block to the front of the frame. Weld an upper steering block to the top of the kart's steering post. Using a MIG welder, tack together the parts to check for a good fit, and make final welds to complete the frame. Clamp the steel in a vise and file or grind the cut edges smooth. Use a hacksaw or chop saw to cut metal stock to length. "You're on your own, but that's the fun of it," Erd says.
Browse parts suppliers' websites to find additional advice on materials and methods.
Plans like these, whether they are free or require a fee, often give frame dimensions but leave steering, axle, throttle and cable connections up to the builder. 3MB, requires Adobe Reader) Erd and his 7-year-old son, Harrison, used $14.99 plans for the "Black Widow" go-kart from.
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