I had a Cat 400x that was too far gone to restore (no seat, no shocks, bent and bugger-welded bars, rotten tires, roached engine, etc.), so I sold the stars, fender, stand, and flywheel off it and made enough money to build it out with $ left over. The engine is an HSSK50 from a Lawnboy snowblower, Carlisle turf-saver tires off the same blower, the shocks are a bit too beefy ATV take-offs, I got an original Kelsey Hayes caliper off eBay for $20, Coleman CT200U seat, fabricated a steel seat frame, welded my own chain tensioner, key switch panel, and brake cable mount to the chassis, plus I had to dissect the bars, bend, and welded them back together. It came out as a really nice rider none-the-less!