JS Motorsport Technical
Ultralight rods and pistons for Solid frames

The bushless ultralight rod below was designed for 750 solid framed bikes such as the Atlas and 500 to 650 Dominators. This rod is good for long stroke 750s up to 75 hp. Also works for short stroke 500 classic racers. They weigh 10 grams less on the small end than our regular bushless rod. Small end = 95 grams. Big end = 307 grams. This ultralight rod provides maximum smoothness for solid framed bikes. Crank rebalancing required. Requires DLC pins.

ultralight rod

68 to 69.5mm Hi C.R flat top pistons for 650 SS Dominator

The 68.5mm flat top piston below is refered to as 9:1 C.R. (closer to 8.5:1 C.R.) for 650SS Dominators. These pistons weigh approx 170 grams and go with our Ultralight 6.4″ length rods.

69mm flat

68 – 69.5mm domed pistons for 600 & 650ss Dominator

The 66 to 68.5mm centrally domed piston below is approx 10:1 C.R. for 500 Dominators. These pistons weigh approx 170 grams and go with our Ultralight 6.4″ length rods.

69mm dome

66 – 68.5mm domed pistons for 500 Dominator

The 66 to 67.5mm centrally domed piston below is approx 9:1 C.R. for a 500cc Dominator. These pistons weigh approx 170 grams and go with our Ultralight 6.4″ length rods.

67mm 170gm pistons

The bottom side of the dome is 3D undermilled to achieve minimum weight as in the photo below.

domed underside

66 – 68.5mm flat top pistons for 500 Dominator

The 66 to 67.5mm flat top piston below is approx 7.5 C.R. for a 500cc Dominator. These pistons weigh approx 170 grams and go with our Ultralight 6.4″ length rods.

Ultra lightened piston option

The skirts can be drilled and pins taper bored on special request as below for all size solid framed bikes and high RPM racers.

lightened piston-gray