Honda TRX 400EX XR400 400X 416 440 Cometic Top End Gasket Kit C7826 89mm MLS USA
C7826, C7825, 12251-KCY-671, 12191-KCY-671, 91302-356-000, 18291-MN5-650, 14523-KBB-901, 91301-200-000, 91306-MG3-000, 91301-679-003, 18291-MN5-650, 91303-397-000, H0401027S, H0401SP2027S, H0402027S, B0244020RC, R88X2B, EX691064AM, EC578020RC, R10X2V, 3231V, R011V, R127V, R132V, R219V, R45.5X2.5V, 12209-KL4-005, 71016-4
🧩 HONDA XR400 / 400EX / 400X COMETIC 89MM BIG BORE TOP END GASKET KIT – C7826
Fits XR400R / TRX400EX / TRX400X – All Years – 86mm to 89mm Bore
Seal in unbeatable compression and top-end reliability with this Cometic USA-Made C7826 Gasket Kit—perfect for 416cc, 426cc, or 440cc high-performance rebuilds.
Built for extreme conditions and high compression, this kit delivers rock-solid sealing under full throttle abuse, race heat, and aggressive riding.
✅ Kit Includes & Benefits
- Complete Cometic Top End Gasket Kit
- Includes high-performance MLS (Multi-Layer Steel) head gasket
- Works for big bore sizes: 86mm, 87mm, 88mm, 89mm
- Ideal for 416cc, 426cc, 440cc rebuilds
- Perfect for high compression pistons
- Part # C7826 – UPC: 191070011307
- Made in the USA
📦 Fitment Guide
Honda (ATV)
TRX400EX Sportrax (1999-2008)
TRX400X (2009, 2012-2014)
Honda (MC)
XR400R (1996-2004)
⭐️ Why Buy from BPRATV?
We’ve sold thousands of these kits—trust our experience and expertise to power your rebuild right.
❓ Frequently Asked Questions
Q: Will this fit my 2002 TRX400EX with an 87mm piston?
A: Yes! This kit is made for 86–89mm big bore top ends.
Q: Is the head gasket in this kit MLS?
A: Absolutely. This kit includes a Multi-Layer Steel head gasket for superior sealing.
Q: Can I use this with a stroker crank?
A: Yes, it's compatible with big bore + stroker setups (416–440cc).
Q: Is this kit made in the USA?
A: Yes—Cometic is proudly manufactured in the USA.
C7826, C7825, 12251-KCY-671, 12191-KCY-671, 91302-356-000, 18291-MN5-650, 14523-KBB-901, 91301-200-000, 91306-MG3-000, 91301-679-003, 18291-MN5-650, 91303-397-000, H0401027S, H0401SP2027S, H0402027S, B0244020RC, R88X2B, EX691064AM, EC578020RC, R10X2V, 3231V, R011V, R127V, R132V, R219V, R45.5X2.5V, 12209-KL4-005, 71016-4
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NOTICE REGARDING PHOTOS: Product photos used in our listings are for example only to show the high quality of our components. You will receive the correct quantity, size, and fitment of bearings, titanium fasteners, nuts, and bolts for the specific kit listed.
BEARING NOTICE: In some cases, you may receive SEALED bearings. If your application requires an OPEN bearing, the seals can easily be removed.
EMISSIONS & RACE USE ONLY: This product is exempt from emission standards and requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code §§ 27156 and 38391]. Sold ONLY for use with EPA-certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing. Installation may void vehicle manufacturers' warranty and/or may be illegal in some locations.
WARRANTY & LIABILITY: © BPRATV LLC 1-year limited warranty from manufacturer for material/workmanship defects.* Due to the nature of high performance and racing, components are sold without express/implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not be liable for specific, incidental, or consequential damages (loss of property, equipment, profits, or revenue) resulting from sale, installation, or use of these parts. This product is NOT DIY; we strongly recommend work be done by a qualified, experienced mechanic.
RETURNS: Returns accepted within 30 days for items 100% complete, brand new, and in original packaging. Items installed or prepped (lubricated/sealed) are ineligible. For warranty consideration, parts MUST be sent back for physical inspection. No exceptions. We do not warranty based on photos, emails, or third-party assessments.
SPECIALTY WARRANTIES: Cub Cylinders: Lifetime warranty for original owner via BPRATV/Millennium Technologies inspection; covers cylinder only. Titanium Fasteners: Failure during use results in replacement only. Neither warranty covers improper tuning, installation, maintenance, or misuse.
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