CBR600RR A

Intake runners are cleaned of casting flash but cast surface left intact to promote turbulence. Ports are matched from head to throttle body boots.

Exhaust ports are heavily machined to smooth the path as much as possible, diameter is left close to stock to keep gas velocity high. Mirror finish is desirable to prevent buildup of particulates.

Combustion chambers are machined as little as possible, but enough to remove any sharp edges that could be heat risers and promote preignition. Valves and seats are given 5-angle radius. Head is milled to true. This motor is already at near the limit for piston-to-valve clearance, so intake valves are slightly recessed in the seats to allow for milling.

Racing engines operate under very different conditions compared to their street counterparts. Removing the thermostat assembly allows for higher flow to the radiator to provide greater cooling efficiency. The increase in cooling ability on hot days is significant compared to stock. On the downside the bike takes a lot longer to warm up, because the entire volume of coolant must be heated rather than just the water jacket on the block. More care and attention must be taken when riding the bike to ensure that the bike doesn't run too cold on cooler days, shrouds must be used on the radiator surface to prevent air flow on cold days or during cooler morning sessions.

The PAIR system injects fresh air from the airbox directly into the exhaust port to burn any extra hydrocarbons left over after the combustion cycle. On a race bike we don't worry about such things and there is a significant weight savings to be had by removing the system, not to mention space and complexity savings.

Here on the valve cover you can see the two silver covers that are on top of the reeds. The nipples on the tops are plumbed into an air pump, which draws from the airbox. The entire air pump assembly can be removed and discarded.

Stock radiator hoses on this bike were mangled and needed to be replaced. Samco also does away with the section of upper radiator hose which is made from aluminum and is prone to being crushed in a tip-over. Silicon hoses are tough, durable, nicer to work with, and look bad ass to boot.

Upper radiator hose shown feeding the radiator cap housing and radiator. Also shown is the radiator overflow mounted to the ram air tube (Motion Pro). Notice all hose cllamps and the radiator cap are safety wired to prevent any potential of a leak occurring if a hose clamp were to loosen off.

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