If your ATV, scooter, or dirt bike won't start, there's a good chance you need one of these starter solenoid relays. This WOOSTAR 2-pin solenoid is built to handle the tough job of receiving and storing ignition voltage from your magneto, then delivering it to the high voltage package at exactly the right time. We're talking compatibility with 50cc, 110cc, 150cc, 200cc, and 250cc engines from brands like Taotao, Buyang, Coolsport, Kazuma, Sunl, Roketa, and AIM-EX. The dimensions are spot on - 48mm length, 50mm height, with 19mm mounting hole distance and 126mm wire length. Installation is pretty straightforward if you're handy with basic tools. But here's the important part: PLEASE double-check your model number and size before ordering to make sure this is the right fit for your specific engine. WOOSTAR has been in the automotive game for over 10 years, so they know their stuff when it comes to quality parts. Each month they're dropping new products, and they even do custom orders if you need enough quantity. If you run into any issues, their customer service team is actually helpful - they'll work with you on replacements or refunds if something isn't right. This is one of those small but crucial parts that can get your ride back in action without breaking the bank.