"Airlock" Intake & Exhaust Valves | Honda CT90 / Trail 90

Part

Intake and exhaust valves for Honda CT90 - "Trail 90" Motorcycles 

Why You Need This

No top end engine rebuild is complete without a fresh set of valves. If you are restoring the cylinder head on your Honda Trail 90, Common Motor has you covered with these premium intake and exhaust valves, designed to replace your old and worn-out OEM valves. 

Our Common Motor Collective "Airlock" valves surpass the OEM standard. Specifically engineered for vintage Honda CT90 motorcycles, these valves are a result of collaborations with one of the world's leading OEM engine valve manufacturers. Crafted with modern materials, they are built to deliver superior performance compared to the originals. 

Valve Specs:

• Manufactured from Japanese JIS-standard SUH35 steel.
• Coated with Tuffride plating.
• Extra wide valve face to accommodate variations in worn valve seats to improve ease of lapping.
• Stellite #1 coated (50-58 HRC) on the tip of the valves (extra hard for the tapping of the rocker arm tips) to prevent "mushrooming".

While replacing the valves, make sure to measure the valve guides and replace them if they're out of spec. If this is beyond your scope of skills we do offer a cylinder head rebuild service. 

While the head's off the engine, refresh everything with a set of new gaskets for your Honda Trail 90. 

*Note: These intake & exhaust valves fit Honda CT90K0 models from Engine SN 122551 & up. 

Installation Tip

Valve seats need to be inspected and touched up by a qualified machine shop if heavily pitted. Otherwise, you need to lap with the new valves to the old seats. Guides must be measured for excessive play or wear. Guides will need replacement before attempting to cut or lap valve seats. The Honda Trail 90 uses valve stem seal on the exhaust that should be changed when the valves are replaced.