SKU: 90066925716

1978-1990 Honda Z50J (6v) 50cc Complete Top End Kit 12200-GK4-761 12301-086-000

$69.99 $77.77
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Description

1978-1990 Honda Z50J (6v) 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: 90066925716

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4.4 ★★★★★
Based on 13 reviews
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M
Verified Purchase
Mark S
Port Orchard, US
★★★★★ 5
Fantastic and elegant looking nightstand or bathroom tray
Color: White 1 Pack, Size: 8" x 8" x 1.8"
I absolutely love this nightstand tray! The elegant gold trim gives it a luxurious look that instantly elevates my nightstand decor. It works perfectly as a perfume or cologne organizer and keeps all my bottles beautifully displayed. I’ve also used one as a dresser organizer countertop to hold jewelry and skincare, and another as a stylish key tray or key holder bowl by the front door. The quality is excellent and the design is both functional and beautiful. I love it so much, I’ll definitely be buying a few more to stack it up in a couple of my rooms. Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2025
P
Verified Purchase
Pearl
Omaha, US
★★★★★ 5
Looks expensive
Color: Black 1 Pack, Size: 8" x 11" x 1.8"
I love this tray on my nightstand! It keeps all my little objects together & looks expensive.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
S
Verified Purchase
Silas Growden
Los Angeles, US
★★★★★ 5
Comfortable, Simple, Reliable
Size: Tenkeyless, Pattern Name: Keyboard, Size: Tenkeyless, Pattern Name: Keyboard
This is a phenomenal product, and exactly what I wanted. I used to have wrist pain while gaming; I bought this, and then completely forgot that I used to get wrist pain while gaming. The foam is firm, but comfortable; it’s very supportive, but also flat and consistent. It’s cool, so my wrist never gets sweaty or hot just from using the wrist rest. Its rubberized bottom prevents it from moving at all while gaming. I’ve used it for about a year, and the foam has no indentation at all; in fact, there’s not noticeable wear of any kind. My one complaint, that I’ve seen in other reviews as well, is that the fabric skin of the wrist rest isn’t quite fit over the foam: there’s some extra material, and it can wrinkle slightly. Overall, I’m quite satisfied with the product! It’s completely eliminated my wrist pain, and I’ve gotten a year of use out of it with no problems so far. I’d say that’s more than worth the fair price, and I would buy it again without hesitation!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 17, 2026
J
Verified Purchase
John
Lexington, US
★★★★★ 5
Very High Quality Memory Gel Foam
Size: Mouse, Pattern Name: Mouse
Firmness is pretty solid, this material is high quality. This isn't that kind of foam that will start loosing it's shape after a year or two, this is a firm gel like substance and it's pretty comfortable. The color is black as I expected, it's shape is rectangle just like in the pictures, it's appearance is as described. The only think is that they do use a polyester cover, which does appear as though it may wrinkle over time, and it will likely not outlast the Gel Foam inside. Like I said though the Gel Foam is legit Gel Foam, I have heard these claims before only to find out that it's something far cheaper, that's not this.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 2, 2026
N
Verified Purchase
NotQuesoAtAll
Boise, US
★★★★★ 5
Awesome
Size: Full Size, Pattern Name: Keyboard, Size: Full Size, Pattern Name: Keyboard
If you spend more than a few hours a day at your keyboard, stop what you’re doing and buy this wrist rest immediately. I was starting to feel serious strain after long typing sessions, and this simple accessory has completely eliminated the discomfort. It’s a true game changer for desk ergonomics. The material quality is phenomenal. The memory foam (or gel) is perfectly supportive—it’s soft enough to cushion my wrists but firm enough that it doesn't flatten out or lose its shape, even after weeks of heavy use. The non-slip base is also fantastic, keeping it anchored exactly where I need it, no matter how intense my typing or gaming gets. What I appreciate most is the immediate relief. The height and angle are spot on, positioning my hands and wrists in a neutral, comfortable alignment. The reduction in pressure on my carpal tunnel area was noticeable within minutes. I can now work for extended periods without the usual aches or stiffness. This is a simple, high-impact product that vastly improves quality of life at the computer. It’s durable, comfortable, and absolutely essential for wrist health. Worth every penny for the long-term comfort it provides!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 7, 2025

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