17R-Stage E Head Kit, Entry Model for Monkey/Gorilla/CD50/CL50/Benly/DAX50/Cub, etc.

Details:
・Optimized valve included angle and combustion chamber shape to improve combustion efficiency.
・Increased intake valve outer diameter to 26mm and exhaust valve outer diameter to 22.5mm, and significantly changed port shape to enhance intake and exhaust efficiency.
・Made both IN/EX stem diameters 4.5mm, used a single valve spring, and equipped a more compact valve spring retainer to improve valve followability.
・This is an entry model of the 17R-Stage, which offers improved cost performance by setting a camshaft for entry-level use, allowing the reuse of compatible genuine parts, and reducing the number of included parts. In addition, by upgrading the camshaft, it can be upgraded to 17R-Stage +D. Furthermore, if upgraded to 17R-Stage +D, displacement can also be increased, allowing for further upgrades.
・This part is developed for closed course competition and cannot be used on public roads. If used on public roads, increasing the displacement will change the vehicle classification from Class 1 moped to Class 2 moped. It must comply with the safety standards of the Road Transport Vehicle Act, and registration as a Class 2 moped will be required. Also, the regulations of the safety standards of the Road Transport Vehicle Act vary depending on the model year. Please check and comply with the safety standards of the Road Transport Vehicle Act and register accordingly. Applicable cylinder heads:
HONDA
・MONKEY/GORILLA /Z50J-2000011～, AB27-1000001～1899999
・MONKEY BAJA /Z50J-1700001～
・CD50/CD50-1500001～
・CL50/CD50-4000001～
・BENLY50S /CD50-2200005～
・DAX50 /AB26-1000001～
・MAGNA50 /AC13-1000001～
・CRF50F, XR50R/AE03-1000001～, AE03-1400001
・SUPER CUB50 /C50-0200001～0999999, C50-2100001～2299999, AA01-1000001～1699999
・LITTLE CUB /C50-4300001～, AA01-3000001～3999999
・☆CD90/HA03-1100005～
・☆CUB110EX /HA05-0000037～0002036
・☆SUPER CUB90 /HA02-1800001～
☆ indicates compatibility with engines of the above frame numbers. *The image is a drawing of the product, not an actual product image. Please be aware.
*The image is for illustrative purposes only, and the design and specifications of the products shown are subject to change without notice. Thank you for your understanding.