Valve spring compressor Trx Xr Crf 80 100 200 250 400 450 500 400ex 250ex 300ex New Universal Valve Spring Compressor Valve spring compressor is a must for four-stroke owners Heavy-duty steel construction complete with a plastic carrying case Comes with 16mm, 19mm, 23mm, 25mm, and 30mm collars that feature large windows for easy access to valve keepers Adjustable design works on a wide variety of machines