SKU: 20438184092

1990 Honda ATV TRX300 Cylinder Piston Top End Gasket Kit 12000-HC4-000 12251-HA0-004

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Description

1990 Honda ATV TRX300 Cylinder Piston Top End Gasket Kit 12000-HC4-000 12251-HA0-0041988 2000 Honda TRX300 Fourtrax FW 4x4 2x4 Cylinder Piston Top End Gasket Kit Features: Kit includes cylinder, spark plugs, oil filter, piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured). Cast piston has super high silicone content for additional strength. Piston skirts are Molybdenium Teflon coated to minimize resistance wear and provide extended life. Piston dome is anodized for superior heat resistance and longer

1988-2000 Honda TRX300 Fourtrax FW 4x4 2x4 Cylinder Piston Top End Gasket Kit

Features:
Kit includes cylinder, spark plugs, oil filter, piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured).
Cast piston has super-high silicone content for additional strength.
Piston skirts are Molybdenium Teflon coated to minimize resistance/wear and provide extended life.
Piston dome is anodized for superior heat resistance and longer lifespan.
The gaskets use performance materials to increase durability and provide greater reliability.
Includes all gaskets pictured to rebuild top end.
Kit is for standard bore size - 74.00 mm.
All of the components within this kit are bolt-on ready for a hassle free installation.

Specifications:
Condition: Aftermarket 100% Brand New
Quantity: 1 Set
Cylinder Material: High-Grade Cast Aluminum
Piston Material: Forged Aluminum
Bore Size: STD 74.00mm
Spark Plug Dimension:
Thread Diameter: 12mm
Thread Length: 19mm
Electrode Gap:0.9mm

Replacement Part Number:
Cylinder: 12000-HC4-000, 12100-HC4-000
Cylinder head gasket: 12251-HA0-004
Cylinder base gasket: 12191-HC4-900
Cylinder o-ring(78.3x2mm): 91304-HA0-003
Valve tappet cover o-rings(57x3mm): 12392-HC4-005
Cylinder o-ring(33.7x2.4mm): 91305-HA0-680 (Sits Between Cylinder and Intake Manifold)
Intake pipe gasket: 18291-MN4-920
Valve stem seals: 12209-KL4-005
Oil filter: 15412-HM5-A10

FITMENT:
Fit for Honda TRX 300 2x4 & 4x4 FW four-wheelers 1988-2000
(This is for the Utility Model ATVs with the rack on the front and the back, NOT the race model ATVs)

Fit for 1988 Honda ATV TRX300 FOURTRAX 300
Fit for 1988 Honda ATV TRX300FW FOURTRAX 4X4
Fit for 1989 Honda ATV TRX300 FOURTRAX
Fit for 1989 Honda ATV TRX300FW FOURTRAX 4X4
Fit for 1990 Honda ATV TRX300
Fit for 1991 Honda ATV TRX300
Fit for 1991 Honda ATV TRX300FW
Fit for 1992 Honda ATV TRX300
Fit for 1992 Honda ATV TRX300FW
Fit for 1993 Honda ATV TRX300
Fit for 1993 Honda ATV TRX300FW
Fit for 1994 Honda ATV TRX300
Fit for 1994 Honda ATV TRX300FW
Fit for 1995 Honda ATV TRX300
Fit for 1995 Honda ATV TRX300FW 4X4
Fit for 1996 Honda ATV TRX300 FOURTRAX
Fit for 1996 Honda ATV TRX300FW FOURTRAX 4X4
Fit for 1997 Honda ATV TRX300
Fit for 1997 Honda ATV TRX300FW 4X4
Fit for 1998 Honda ATV TRX300
Fit for 1998 Honda ATV TRX300FW 4X4
Fit for 1999 Honda ATV TRX300 FOURTRAX
Fit for 1999 Honda ATV TRX300FW FOURTRAX 4X4
Fit for 2000 Honda ATV TRX300
Fit for 2000 Honda ATV TRX300FW 4X4

Package includes:
1x Cylinder
1x Standard Size Piston
1x Piston Ring Set
1x Wristpin
2x Circlips
1x Oil Filter
1x Cylinder Head Gasket
1x Cylinder Base Gasket
1x Exhaust Gasket
2x Valve Stem Seals
1x Exhaust Gasket
1x Cylinder O-ring(78.3x2mm)
2x Valve Tappet Cover C-rings(57x3mm)
1x Sits Between Cylinder and Intake Manifold O-ring(33.7x2.4mm)
1x Exhaust Pipe Gasket
2x Spark Plug

Note:
Ring end gaps are checked prior to shipment for proper sizing.
Please check out the product and size fits your motorcycle or not before you purchase.

Warranty:
Returns: Customers have the right to apply for a return within 60 days after the receipt of the product
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: 20438184092

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4.8 ★★★★★
Based on 5 reviews
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Product Reviews
D
Verified Purchase
Doc
Birmingham, US
★★★★★ 5
Great Toy for tiny to giant pups
Color: Gray, Size: 8 IN
Cute Amarillo. My teacup Yorkie uses it as a pillow or chases and attacks it. Well stretched does not easily fall apart. Good value for the money. Suitable for all sized dogs.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
J
Verified Purchase
James Brummett
Lexington, US
★★★★★ 4
Fun dog toy, but not for heavy chewers
Color: Pink, Size: 14 IN
The armadillo is cute. My pittie, Sasha, was very excited to see it. She just had TPLO surgery on her left knee (she tore her ACL just before the 4th of July), and I wanted to get her something she could play with while she convalesces, that isn't a ball—she really likes to run and jump and chase the ball, but with her knee out of commission, I didn't want her to get depressed being trapped in her crate while she heals—with this toy, she was able to keep playing and not over excert herself and get more hurt. It quickly became her favorite toy; she chews it relentlessly and gets made when I take it from her (see below). It makes a funky squeak that's not a high-pitched squeak, like I thought it would be; it's more a low-pitched, lowing sound like a baby calf. One thing I would like to point out to other purchasers about what the description says: "Durable and Long Lasting - Made from premium soft materials, our cute plush dog toys can withstand rough play for indoor or outdoor and last for years to come. The textured surface also helps massage and soothe your dog's gums during playtime" This is a little misleading. It's a good texture and Sasha loved to play with it, but it wasn't very durable. It might be when compared to other chew toys, but not for my baby. She tore the nose off within 20 minutes of getting it. The next morning, she ripped off an ear, and I had to pull the stuffing out of the face so she wouldn't eat it while chewing away. She doesn't seem to mind, but I sure wish it had held up a little more. All-in-all, this was a good toy for a few days.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 29, 2025
M
Verified Purchase
Maria
Louisville, US
★★★★★ 5
Cute durable dog toy that my puppy loves
Color: Blue, Size: 8 IN
This small light weight dog toy is very durable, super cute, and my dog loves it. My dog tears everything up but he hasn't made a dent in this; very durable and chew resistant. He seems to really like that it makes a lower squeak noise. I threw this in my cart at the last minute before checkout and I am pleasantly surprised with the quality. I would say this toy is worth the price; suitable for small to medium sized dog.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
I
Verified Purchase
IntelliCABlonde
Port Orchard, US
★★★★★ 5
Nice toy for a bigger dog
Color: Gray, Size: 6 IN
My little rescue chihuahua has exactly one toy he can make squeak. This one is cute and he did try, but no luck. I have two large baskets of toys I've bought in the 3 years I've had him. He is only able to make one squeak. He loves it to death because he loves the squeak. It's a hedgehog that I will try to find on Amazon and replace. Poor little dog just has a very small mouth.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
A
Verified Purchase
Al
Pawtucket, US
★★★★★ 5
Semi durable
Color: Gray, Size: 8 IN
My dog has had this for 1 month, and it is still doing good! It has lost 3 out of 4 legs, but thw body is pretty strong. Dog loves the honk noises.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 7, 2026

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