Big valve cylinder head kit for CT125 (JA55) and other old horizontal engines This is a big valve cylinder head for Honda's old horizontal engines. Intake 28Φ, exhaust 24Φ. Please note that this product cannot be installed on genuine cylinders. Compatible with cylinder inner diameter 56Φ or more.
By using a big valve, efficiency during intake and exhaust will be dramatically improved. Furthermore, the port has been enlarged for a pleasant engine feeling.
We recommend installing it at the same time as the bore up kit. A set includes a high cam and reinforced valve spring. After installing this product, I have traveled more than 10,000km without any trouble, even under harsh usage conditions. This is a masterpiece that we can recommend with confidence.
By using a big valve, efficiency during intake and exhaust will be dramatically improved. Furthermore, the port has been enlarged for a pleasant engine feeling.
We recommend installing it at the same time as the bore up kit. A set includes a high cam and reinforced valve spring. After installing this product, I have traveled more than 10,000km without any trouble, even under harsh usage conditions. This is a masterpiece that we can recommend with confidence.