This Starter Relay / Starter Solenoid commonly applies to (and is not limited to) 50cc 70cc 90cc 110cc 125cc 150cc 200cc 250cc up to 500cc electric start engines. This relay operates in the same way as other non-fuse based relays and using a 20A in-line fuse is one of the best ways to provide additional circuit protection. Bolt studs are 2cm apart center to center. This is a relay solenoid commonly used for (not limited to) the Baja 250cc Wilderness Trail 250 (WD250-U) ATV - VIN Prefix LLCL, Baja Part Number 250U-559 as well as a large number of other machines in the 200cc to 500cc range, such as the 500cc Moose tracker etc.