Original Yamaha part. Partnumber 39w-22151-00. Fits following models (check your manual please!):
1984 Yamaha YZ 125
1985 Yamaha YZ 125
1983 Yamaha YZ250K
1984 Yamaha YZ250L
1985 Yamaha YZ 250
1984 Yamaha YZ 490
1985 Yamaha YZ 490
1984 Yamaha IT 200
1985 Yamaha IT 200
1986 Yamaha IT 200