Kitaco 88cc BIG Bore-Up Kit suitable for use with Z50J 6V, ST50 Dax 6V

Kitaco 88cc STD-Type2 Big Bore Kit with Aluminum Cylinder (Part No. 214-1013202)

This kit is compatible with the following Honda models and frame number ranges:

• Monkey / Gorilla: Z50J-1000001～1323946 and Z50J-1323947～1510400
• Dax 50 (6V): ST50-1000001～6299999 and ST50-6300022～6346265
• Chaly 50: CF50-1000001～2899999
• CD50: CD50-1100001～1330600
• Dax 70 (6V) and Chaly 70 (6V) (ST70 / CF70 models)

This reliable 88cc STD-Type2 Big Bore Kit from Kitaco is engineered for Honda Monkey, Gorilla, and the compatible models listed above. It delivers strong, usable power and torque improvements throughout the RPM range while remaining well-suited for everyday street riding.

Kit Contents & Performance Features

The kit includes a high-durability cylinder head featuring an optimized combustion chamber, improved port shapes, larger valves, a high-lift camshaft, and a high-compression cast piston. These components work together to enhance airflow and combustion efficiency, resulting in noticeably better low- to mid-range torque and improved top-end performance compared to the stock setup.

Key specifications:

• Displacement: 88cc
• Bore: φ52mm
• Stroke: 41.4mm (retains the stock crankshaft)
• Pre-assembled valves in the cylinder head
• High-compression piston matched to the combustion chamber

Cylinder Construction: Aluminum with Cast Iron Sleeve

This version features Kitaco’s standard aluminum cylinder with a cast iron sleeve inserted into the bore. This is a proven, cost-effective design widely used in performance upgrades.

Benefits of the Aluminum + Cast Iron Sleeve Cylinder:

• Excellent durability: The cast iron sleeve provides a hard, wear-resistant surface that stands up well to the piston rings, offering reliable long-term performance in a big bore setup.
• Good heat management: The aluminum outer cylinder helps with heat dissipation while the iron sleeve maintains excellent strength and stability under operating temperatures.
• Proven reliability: This traditional sleeved design has a strong track record in Honda Monkey-family engines and is ideal for riders seeking solid performance without the premium price of the hard chrome version.
• Great value: It delivers all the power gains and engine improvements of the Type2 kit at a more accessible price point.

This kit is an outstanding choice for enthusiasts looking for a significant power increase with dependable, everyday usability. For best results, we recommend using high-quality engine oil, correct carburetor jetting, and following proper break-in procedures. Professional installation is advised, and always verify compatibility with your specific model and year.