Part: Piston Rings (Standard / 0.5 mm over size / 1.0 mm over size) for Honda CB450 / CL450 Scrambler / CB500T – Sold Individually
Why You Need This: The Honda CB450 / CL450 Scrambler / CB500T engines are pretty stout and we have seen some bikes with a lot of miles on them that keep on trucking. However engines need to be freshened up as oil leaks occur and compression dwindles. We have seen that many Honda CB450 / CL450 Scrambler / CB500T engines do not need the cylinders bored as they are within service limits. This means that a hone and a fresh set of standard piston rings will get you back on the road. If the cylinders do end up measuring outside the published service limit (or are very close to being there), they will need to be bored oversize. This will require new oversize pistons and matching oversize piston rings to be installed along with a new wrist pin and retaining clips. Fortunately for you, we got your back in both cases with our modern piston rings designed to improve sealing, ease of installation and ensure long service life.
Piston Ring kits are offered in three different sizes for the CB450 / CB500T family of engines:
Standard (70 mm bore)0.5 mm Over Size1.0 mm Over Size
Standard (70 mm bore)
0.5 mm Over Size
1.0 mm Over Size
Our standard piston ring kits are designed to fit the factory Honda pistons in standard size (70 mm) used in the Honda CB450 / CL450 Scrambler / CB500T engines.
Oversize piston ring kits are available in 0.5 mm and 1.00 mm oversize, designed to fit factory Honda oversize pistons as well as our very own "Pulsar" series oversize pistons.
Each piston ring set includes:
A gas nitride coated forged steel top ring (silver). This is a hard coating on all surfaces of the ring which gives it increased wear resistance and a lower coefficient of friction on the cylinder walls.
Steel phosphate 2nd ring (black).
An easy-to-install modern nitride three piece oil ring, which makes installation onto the piston and cylinder assembly a LOT easier than the old style brittle cast iron one piece oil rings.
Piston ring sets are sold individually, one set per piston, you will need two sets per engine. We highly suggest adding mew wrist pins with clips and a fresh overhaul gasket kit to finish the rebuild off correctly.
Installation Tip: Cylinders must be measured and checked for taper, roundness and top ridge, you will need a micrometer and either the telescoping gauges or dial bore gauge to complete this. If everything measures out then the cylinders must be cleaned up with a cylinder hone to accept new rings. We always recommend to double check machine work. Top and second rings are identical and installed with the "top" marking or beveled edge of the rings facing up towards the crown of the piston. Oil ring is installed with the wavy ring first, then sandwiched with the thin rails top and bottom. Make sure to check the piston ring end gap on the compression rings prior to installation. Minimum gap is 0.012" (0.3 mm) and maxim gap is 0.030" (0.5 mm). Rotate the open ends of all the rings 180 deg apart from one another once on the piston. Oil rings and cylinders well prior to installation.