SKU: 15935600386

1978 Honda Z50A 78'/ Z50J1 50cc Complete Top End Kit 12200-GK4-761 12301-086-000

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Description

1978 Honda Z50A 78'/ Z50J1 50cc Complete Top End Kit 12200-GK4-761 12301-086-000Honda ST 50 Dax C 50 Z 50 Monkey Z50R XR CRF 50 50cc Complete Top End Kit Features: Complete engine cylinder Top end rebuild kit for Honda 50cc. If your cylinder blows through, the compression is too low, or even a piston seizure has occurred, then this kit is exactly the right thing for you. Kit includes cylinder, cylinder head, piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured). Includes all gaskets pictured to rebuild

Honda ST 50 Dax C 50 Z 50 Monkey Z50R XR CRF 50 50cc Complete Top End Kit

Features:
Complete engine cylinder Top end rebuild kit for Honda 50cc.
If your cylinder blows through, the compression is too low, or even a piston seizure has occurred, then this kit is exactly the right thing for you.
Kit includes cylinder, cylinder head, piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured).
Includes all gaskets pictured to rebuild top end.
Kit is for standard bore size - 39mm, 13mm steel piston pin.
This kit is excellent as a low-cost replacement for defects in the original cylinder.

Specifications:
Condition: Aftermarket 100% Brand New
Quantity: 1 Set
Material: Aluminum
Displacement: 49cc
Bore Type: Standard Bore
Bore Size: STD 39mm
Pin Diameter: 13mm
Cooling system: Air cooled

Replacement Part Number:
Cylinder: 12101-GB2-000
Cylinder Head: 12200-GK4-761
Cylinder Head Cover: 12301-086-000
Cylinder Head Cover Gasket: 12391-035-306, 12391-GB2-000
Cylinder Head R Side Cover: 12331-GB0-910
Cylinder Head R Side Cover Gasket: 12394-GB0-910
Cylinder Head L Side Cover: 12341-065-920
Cylinder Head L Side Cover Gasket: 12395-GB2-306
Valve Tappet Cap(x2): 12361-035-000
Cylinder Base Gasket: 12191-GW8-681, 12191-GW8-682, 12191-035-010, 12191-035-000
Cylinder Head Gasket: 12251-GBJ-003
Piston (Std): 13101-GBZ-701, 13101-GBZ-700
Pin, Piston: 13111-GB2-000
Piston Ring Set (Std): 13011-GBZ-702
Circlips, piston: 13115-001-000
Valve Stem Seals: 12209-GB4-681
Carb Insulator Gasket: 16201-165-A10

Fits Models:
Fit for Honda - 2004-2009 - CRF50F - Mini Cycle
Fit for Honda - 2011-2019 - CRF50F - Mini Cycle
Fit for Honda - 2000-2003 - XR50R - Mini Cycle
Fit for Honda - 1969-1978 - Z50A - Mini Trail
Fit for Honda - 1979-1999 - Z50R
Fit for Honda - 1986 - Z50RD
Fit for Honda - 1988 - ZB50
Fit for Honda - 1967 - Z50M
Fit for Honda - 1968-1969 - Z50A - K0
Fit for Honda - 1969-1970 - Z50A - K1
Fit for Honda - 1970-1971 - Z50A - K2
Fit for Honda - 1972 - Z50A - K3
Fit for Honda - 1973 - Z50A - K4
Fit for Honda - 1974 - Z50A - K5
Fit for Honda - 1975 - Z50A - K6
Fit for Honda - 1976 - Z50A - 76'/ Z50J1
Fit for Honda - 1977 - Z50A - 77'/ Z50J1
Fit for Honda - 1978 - Z50A - 78'/ Z50J1

Also fits Dax ST, Monkey, Gorilla, Chaly, SS, C, CD with 6 Volt (!) series engine, Jincheng, Dax Q5, Gorilla Q7, Sasy with 50cc cylinder head!
Fit for Honda - 1978-1990 - Z50J (6v)
Fit for Honda - 2009-2018 - Z50J (FI)
Fit for Honda - 1978-1988 - Z50G Gorilla (6v)
Fit for Honda - 1988-1990 - ST50 Dax
Fit for Honda - 1985-1996 - C50 Cub

(Compatibility Chart is for Reference ONLY!!!)
(Please Compare with Your faulty unit and the image we provided to Decide Fitment)

Package Includes:
1x Cylinder
1x Cylinder Head
1x Cylinder Head Cover
1x Cylinder Head Cover Gasket
1x Cylinder Head R Side Cover
1x Cylinder Head R Side Cover Gasket
1x Cylinder Head L Side Cove
1x Cylinder Head L Side Cover Gasket
2x Valve Tappet Caps
1x Cylinder Base Gasket
1x Cylinder Head Gasket
1x 39mm Piston (Std)
1x Piston Pin
1x Piston Ring Set (Std)
2x Circlips
2x Valve Stem Seals
1x Carb Insulator Gasket
1x O-Ring kit

Note:
Carefully compare to your old parts to be sure this is the correct part for your machine.

The product on offer is an accessory or spare part and thus is not an original product of the vehicle manufacturer.
The name of the vehicle manufacturer is stated only as an indication of the determination of the product being offered as an accessory or spare part, to clarify, for which vehicle the product on offer Fits.

Warranty:
1. Returns: Customers have the right to apply for a return within 60 days after the receipt of the product
2. 24-Hour Expert Online: Solve your installation and product problems

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 15935600386

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Rad V.
Los Angeles, US
★★★★★ 4
Comfortable, Breathable, and Stylish Polo
Color: White, Size: Large, Color: White, Size: Large
I’ve been very happy with this polo shirt. The fabric feels lightweight, soft, and stretchy, making it extremely comfortable to wear throughout the day. The mesh texture provides excellent breathability, and the moisture-wicking material does a great job of keeping you cool and dry in warm weather. The quarter-zip collar gives the shirt a modern, sporty look that stands out from a traditional button polo. It also allows you to unzip it a bit for extra airflow when needed. The fit is true to size with a clean athletic cut that looks sharp without feeling too tight or restrictive. The white color is slightly see-through in bright light, so that’s something to keep in mind. It’s not overly transparent, but it can be noticeable depending on what you wear underneath. One of the things I like most is how versatile this shirt is. It works perfectly for golf, but it also looks great for casual outings, travel, or even business-casual settings. The stretchy material moves comfortably with your body and never feels stiff. The overall quality is very good. The stitching is clean, the zipper feels sturdy, and the shirt has held up well after several washes. It has not shrunk, lost its shape, or shown any fading, which is always a good sign. It also comes out of the wash looking smooth with very few wrinkles, so it’s easy to care for and convenient if you travel often. For the price, this is an excellent value. It offers a great combination of comfort, performance, and style, and it feels like a much more expensive shirt. I would definitely buy more colors.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
D
David M.
Chelsea, US
★★★★★ 5
Deep black and crisp white, this collar really pops.
Color: Black, Size: XX-Large, Color: Black, Size: XX-Large
I love this shirt. The fabric is hard to describe, but it’s very comfortable, cool, and soft. If you’re looking for something highly breathable, this is it. The quality is well made, and the zipper is great. I’m not worried about it splitting or the zipper coming off. It’s fantastic, very comfortable, and fits me really well, even though I’m over 6 feet tall. The value for the money is great. I’ve already mentioned how soft it feels, and the appearance is great too. That white collar really pops against the crisp dark black. I know the picture doesn’t capture it well and looks a bit washed out, but in person the black is very black and the white is crisp white, exactly as shown in the listing photos.
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Reviewed in the United States on April 19, 2026
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Verified Purchase
L. L. Thompson
Pawtucket, US
★★★★★ 5
Nice shoes
Size: 13 Wide, Color: Cement Leather/Nubuck
Looks great!! Comfortable
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Reviewed in the United States on April 18, 2026
G
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Grocery Clerk
Lexington, US
★★★★★ 5
Extremely comfortable stylish shoe
Size: 9.5, Color: Ch British Tan
Very comfortable and stylish shoe that works well for casual or dress. Sizing is as expected. They do tend to feel a bit warm, so might be best for cooler weather.
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Reviewed in the United States on April 1, 2026
K
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Khaled Tallaj
Battle Creek, US
★★★★★ 5
Such a versatile sneaker
Size: 10, Color: Black, Size: 10, Color: Black
Such a versatile sneaker for both casual and smart casual ..lightweight and comfortable for all day use also ..Quality is very good ..Size perfect as i wear 10M us size (43)EU
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Reviewed in the United States on December 10, 2025

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