NOS factory Honda piston ring compressors. The very best available! Nickel plated, exquisitely made. See available sizes below. Very limited supply of these vintage Honda tools. The aluminum blocks shown under the pistons are not included. Those were Honda parts also, and like the compressors long discontinued. Most folks make their own blocks from wood.

These factory ring compressors fit snugly around the pistons and are designed to dodge the cylinder studs.

They are engineered to have plenty of room when the cylinder starts to go on, and be easy to remove with the cylinder in place.

Like the Honda motorcycles they were designed to be used on, these are vintage, factory, top quality ring compressors in factory wrapping.

Nickel plated, exceptionally well made, quality pieces, made by Honda's special tool supplier in Japan.

Note the generous chamfer on the tool, which works together with the chamfer on the cylinder, so that the compressor and cylinder actually overlap when the tool is in place on the piston, giving the piston rings optimum smooth transition into the cylinder.