17R-Stage+D Bore Up Kit 88cc 2.6hp - Monkey (H Cylinder/R-10E)

By improving the port and fin shape from the conventional R-Stage+D and adopting a new profile camshaft, we have achieved even higher output in the high-revolution range!!
Based on the normal head shape, large diameter valves are adopted: Intake: 26mm / Exhaust: 22.5mm.
(12V Monkey normal valve diameter is Intake: 19mm / Exhaust: 16mm)
This is an original Takegawa cylinder head that adopts the optimal valve pinch angle, combustion chamber shape, and port shape in conjunction with the large diameter valves.
The port diameter of the normal head is 14mm for both intake and exhaust, while the port diameter of the 17R-Stage is larger, with intake at 24.5mm and exhaust at 19mm.
Compatible models
:6V Monkey / Gorilla (Z50J-1300017～1510400)
:6V DAX50 (ST50-1000001～6300021)
:6V Chaly (CF50-2300016～2699999)
:6V CD50 (CD50-1300001～1330600)
To fully demonstrate engine performance when installing the 17R-Stage+D, a Takegawa carburetor kit and exhaust system must be installed separately.
*The image is for illustration purposes only. The design and specifications of the products shown are subject to change without notice. Please understand.