Hot Rods 02-18 Yamaha YZ 85 85cc Bottom End Kit - CBK0076

The Hot Rods CBK0076 Bottom End Kit is a purpose-built 2-stroke engine rebuild solution designed specifically for the 2002–2018 Yamaha YZ 85. Rather than hunting down individual components one at a time, this kit bundles everything required for a complete bottom end rebuild into a single, convenient package — saving you time, guesswork, and multiple orders. Whether you're getting a race bike back to full power or refreshing a well-used trail machine, this kit delivers all the core components you need to do the job right the first time.

Key Features & Benefits

• Complete crankshaft included: The heart of any 2-stroke bottom end rebuild, the crankshaft is packaged directly in this kit so you don't need to source it separately — a major convenience and cost consideration for YZ85 rebuilds.
• Main bearing and seal kit bundled in: Main bearings and seals are wear items that should always be replaced during a bottom end rebuild. Having them included eliminates a common follow-up order and ensures you have everything on hand before you start tearing the engine down.
• Complete top and bottom end gasket kit with seals: The kit includes a full gasket set covering both the top and bottom ends, meaning you won't need to purchase a separate gasket kit to seal everything back up after the rebuild.
• Designed for the 2-cycle YZ 85 engine: Hot Rods engineered this kit specifically for the YZ 85's 85cc 2-stroke powerplant, so fit and compatibility are straightforward for the supported model years.
• One-stop rebuild convenience: Sourcing a crankshaft, gasket set, oil seal kit, and main bearing/seal kit individually takes time and increases the risk of ordering mismatched components. This kit consolidates all of those parts under a single part number (CBK0076).
• Saves time and money over piecemeal OEM sourcing: Bundled kits from Hot Rods are commonly cited as a cost-effective alternative to purchasing equivalent OEM parts individually, particularly for competitive youth motocross bikes where rebuild frequency is higher.

Specifications

• Brand: Hot Rods
• Part Number: CBK0076
• SKU: HDSCBK0076
• Engine Type: 2-Cycle (2-stroke)
• Kit Contents: Crankshaft, Gasket Set (top and bottom end), Oil Seal Kit, Main Bearing and Seal Kit
• Application: 85cc Yamaha YZ 85

Fitment

This kit is confirmed to fit the following vehicle:

• 2002–2018 Yamaha YZ 85 (85cc, 2-stroke)

The fitment spans a remarkably long production run — from the 2002 model year through 2018 — making CBK0076 one of the more broadly applicable YZ 85 rebuild kits available. If you're unsure whether your specific year falls within this range, verify your model year before ordering or reach out to our fitment team. This kit is not listed as fitting any other Yamaha model or displacement, so confirm applicability if you're working on a different machine such as a YZ 65 or YZ 125.

What's in the Box

• 1× Hot Rods Crankshaft
• 1× Complete Top and Bottom End Gasket Kit (with seals)
• 1× Oil Seal Kit
• 1× Main Bearing and Seal Kit

Why Buy from ThreePiece.us

• Free Shipping: Every order ships free — no minimum purchase required and no surprise fees at checkout.
• Affirm Financing: Break your purchase into manageable payments with Affirm financing, available at checkout. Rebuilding your YZ 85 doesn't have to hit your wallet all at once.
• Expert Fitment Support: Not sure this is the right kit for your bike? Our team is here to help verify fitment before you order. Reach out via the contact form or call us directly — we've served over 10,000 customers and take fitment seriously.
• Straightforward Ordering: CBK0076 is a regularly stocked product. Order with confidence knowing you're getting the correct Hot Rods bottom end kit for your 2002–2018 YZ 85.

Frequently Asked Questions

Q: What exactly is included in the Hot Rods CBK0076 Bottom End Kit?
A: The kit includes the crankshaft, a complete top and bottom end gasket kit with seals, an oil seal kit, and a main bearing and seal kit. Everything is packaged together under part number CBK0076 so you have all the core components needed for a bottom end rebuild without sourcing them individually.

Q: Will this kit fit my Yamaha YZ 85?
A: CBK0076 is confirmed to fit the 2002 through 2018 Yamaha YZ 85 (85cc, 2-stroke). If your bike falls within that model year range, you're covered. If you have a YZ 85 outside that range or a different model entirely, contact our fitment team before ordering.

Q: Is this a 2-stroke or 4-stroke application?
A: This kit is specifically designed for the 2-cycle (2-stroke) YZ 85 engine. It is not intended for 4-stroke applications.

Q: Do I need any additional parts to complete my bottom end rebuild?
A: The CBK0076 kit is designed to provide everything needed for a standard bottom end rebuild — crankshaft, gaskets, seals, and main bearings are all included. That said, depending on the condition of your engine and the scope of your rebuild, you may want to inspect other components (such as the cylinder, piston, or top end components) and address those separately. Our team can help you assess what else you might need.