# Engine Kits and parts

> This is a plain-text (markdown) copy of a page on tboltusa.com, made for AI assistants. People see the same page at the HTML link below.

- **Breadcrumbs:** [Home](https://tboltusa.com/store/index.md) > [Honda Vintage Mini Bike Parts](https://tboltusa.com/store/honda-vintage-mini-bike-parts-c-101.md) > [Z50 K3-78](https://tboltusa.com/store/honda-vintage-mini-bike-parts-z50-k3-78-c-101_215.md) > Engine Kits and parts
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/z50-k3-78-engine-kits-and-parts-c-101_215_581.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/z50-k3-78-engine-kits-and-parts-c-101_215_581.md)
- **Generated:** 2026-11-06 12:02 EST
- **Site guide for AI assistants:** [llms.txt](https://tboltusa.com/llms.txt)
- **Your list:** To list everything you have looked at in one page, with current prices and stock, add ids to this address (comma separated, up to 20 of each): `https://tboltusa.com/store/seen.md?c=581`

All prices are in US dollars (USD). Shipping and any tax are worked out at checkout.

Products are filed in categories. Most top categories split by bike or engine model; a product can be listed in more than one category.

## Next to this category

- [Bars & Controls](https://tboltusa.com/store/z50-k3-78-bars-controls-c-101_215_571.md)
- [Brake Pads & Pedals](https://tboltusa.com/store/z50-k3-78-brake-pads-pedals-c-101_215_573.md)
- [Carbs & Kits](https://tboltusa.com/store/z50-k3-78-carbs-kits-c-101_215_577.md)
- [Electrical](https://tboltusa.com/store/z50-k3-78-electrical-c-101_215_579.md)
- [Engine Covers & Dress Up Parts](https://tboltusa.com/store/z50-k3-78-engine-covers-dress-up-parts-c-101_215_575.md)
- [Exhaust](https://tboltusa.com/store/z50-k3-78-exhaust-c-101_215_583.md)
- [Pegs & Mounts](https://tboltusa.com/store/z50-k3-78-pegs-mounts-c-101_215_584.md)
- [Seats & Tanks](https://tboltusa.com/store/z50-k3-78-seats-tanks-c-101_215_586.md)
- [Sprockets & Chains](https://tboltusa.com/store/z50-k3-78-sprockets-chains-c-101_215_589.md)
- [Suspension](https://tboltusa.com/store/z50-k3-78-suspension-c-101_215_591.md)
- [Swingarm & Frame](https://tboltusa.com/store/z50-k3-78-swingarm-frame-c-101_215_593.md)
- [Wheels & Tires](https://tboltusa.com/store/z50-k3-78-wheels-tires-c-101_215_595.md)

## Products

Showing 1 to 24 of 24 products (page 1 of 1).

- [TBParts - 889 Piston Z50 K0-81 Standard Bore Replacement](https://tboltusa.com/store/tbparts-889-piston-z50-k0-81-standard-bore-replacement-p-4964.md): part number `TBW0889`; $22.99 USD; 2 left
- [TBParts - Heavy Duty Clutch Kit for 67T- CRF70 , XR70 , Z50 69-87 ,CT70 K0 and 91-94 Models](https://tboltusa.com/store/tbparts-heavy-duty-clutch-kit-for-67t-crf70-xr70-z50-69-87-ct70-k0-and-91-94-models-p-415.md): part number `TBW0971-KIT`; $99.98 USD; 4 left
- [TBParts - Manual Clutch kit for 69-87 Z50 CT70 SL70 XL70 CL70 ATC70](https://tboltusa.com/store/tbparts-manual-clutch-kit-for-69-87-z50-ct70-sl70-xl70-cl70-atc70-p-10836.md): part number `TBW0954`; $189.99 USD; 2 left
- [TBParts - Roller Rocker Race Head V2 Kit for 88cc & 108cc Z50 CRF50 XR50 & Pit bikes](https://tboltusa.com/store/tbparts-roller-rocker-race-head-v2-kit-for-88cc-108cc-z50-crf50-xr50-pit-bikes-p-8600.md): part number `TBW9102`; $549.99 USD; 2 left
- [Vintage Honda 88cc Race Head big bore Kit Z50 K1-78](https://tboltusa.com/store/vintage-honda-88cc-race-head-big-bore-kit-z50-k1-78-p-1427.md): part number `TBW0939-Z50K178`; $419.99 USD; out of stock
- [Honda - OEM Cam Sprocket for Z50 1969-1981](https://tboltusa.com/store/honda-oem-cam-sprocket-for-z50-1969-1981-p-9030.md): part number `14321-035-700`; $20.24 USD; 4 left
- [Honda Z50 50cc Rebuild kit with Full gasket 68-81](https://tboltusa.com/store/honda-z50-50cc-rebuild-kit-with-full-gasket-68-81-p-11617.md): part number `TRC-0830`; $99.00 USD; 5 left
- [Honda Z50 70cc Rebuild kit with Full Gasket Set for 1969-1981 Models](https://tboltusa.com/store/honda-z50-70cc-rebuild-kit-with-full-gasket-set-for-1969-1981-models-p-11379.md): part number `TRC-0241`; $109.00 USD; 4 left
- [Piranha - Black Anodized Drain Bolt for Pitbikes](https://tboltusa.com/store/piranha-black-anodized-drain-bolt-for-pitbikes-p-11557.md): part number `WHS-3443-D`; $10.49 USD; 1 left
- [Piranha - Magnetic Drain Bolt for Pitbikes](https://tboltusa.com/store/piranha-magnetic-drain-bolt-for-pitbikes-p-11556.md): part number `WHS-1243`; $10.49 USD; out of stock
- [TBParts - 1011 Piston Z50 K0-81 0.5mm Oversized](https://tboltusa.com/store/tbparts-1011-piston-z50-k0-81-05mm-oversized-p-5172.md): part number `TBW1011`; $21.99 USD; 1 left
- [TBParts - 108 Stroker Crank Upgrade Kit for 69-79 Z50](https://tboltusa.com/store/tbparts-108-stroker-crank-upgrade-kit-for-69-79-z50-p-10034.md): part number `TBW9090`; $229.99 USD; 2 left
- [TBParts - 50cc Gasket Set Z50 CRF50 XR50 & Pit bikes](https://tboltusa.com/store/tbparts-50cc-gasket-set-z50-crf50-xr50-pit-bikes-p-2349.md): part number `TBW0216`; $13.99 USD; 3 left
- [TBParts - High Volume Oil Pump CT70 Z50 ATC70 TRX70 SL/XL70 Vintage](https://tboltusa.com/store/tbparts-high-volume-oil-pump-ct70-z50-atc70-trx70-slxl70-vintage-p-1380.md): part number `TBW0225-6V`; $33.99 USD; 2 left
- [TBParts - Honda 50/70 Chain Roller Guide Kit](https://tboltusa.com/store/tbparts-honda-5070-chain-roller-guide-kit-p-2030.md): part number `TBW1006`; $13.99 USD; 4 left
- [TBParts - Magnetic Oil Drain Bolt - XR50 CRF50 CRF70 KLX110 & Pit Bikes](https://tboltusa.com/store/tbparts-magnetic-oil-drain-bolt-xr50-crf50-crf70-klx110-pit-bikes-p-271.md): part number `TBW0341`; $6.99 USD; in stock
- [TBparts - Oil seal and O-ring Kit for CT70, Z50, XR/CRF 50/70 and China 50-160cc](https://tboltusa.com/store/tbparts-oil-seal-and-ring-kit-for-ct70-z50-xrcrf-5070-and-china-50-160cc-p-2130.md): part number `TBW1028-0291`; $15.00 USD; 8 left
- [TBparts - Replacment Clutch Kit for Honda 50 and 70 Semi-Auto](https://tboltusa.com/store/tbparts-replacment-clutch-kit-for-honda-50-and-70-semi-auto-p-2796.md): part number `TBW1907`; $24.95 USD; 5 left
- [TBParts - Vintage Honda 108cc Stroker big bore & Nibbi 24mm Carb kit 69-81 Z50](https://tboltusa.com/store/tbparts-vintage-honda-108cc-stroker-big-bore-nibbi-24mm-carb-kit-69-81-z50-p-2634.md): part number `TBW9092-69-81Z50`; $579.99 USD; out of stock
- [TBParts - Vintage Honda 108cc Stroker big bore & VM26 Carb kit 69-81 Z50](https://tboltusa.com/store/tbparts-vintage-honda-108cc-stroker-big-bore-vm26-carb-kit-69-81-z50-p-2626.md): part number `TBW9094-69-81Z50`; $629.99 USD; out of stock
- [TBParts - Vintage Honda 88cc big bore & Carb kit Z50 K0-81](https://tboltusa.com/store/tbparts-vintage-honda-88cc-big-bore-carb-kit-z50-k0-81-p-1425.md): part number `TBW0932-Z50K0-81`; $262.99 USD; 2 left
- [TBParts - Vintage Honda 88cc big bore Kit Z50 69-81](https://tboltusa.com/store/tbparts-vintage-honda-88cc-big-bore-kit-z50-69-81-p-1426.md): part number `TBW0925-Z5069-81`; $149.99 USD; 2 left
- [TBParts - Vintage Race Head V2 108cc Big Bore Kit and Stroker Crank Z50 69-81 CT70 3 speed 69-](https://tboltusa.com/store/tbparts-vintage-race-head-v2-108cc-big-bore-kit-and-stroker-crank-z50-69-81-ct70-speed-69-p-48.md): part number `TBW9110`; $729.99 USD; 2 left
- [TBParts - Vintage Roller Rocker Race Head V2 108cc Big Bore w/ Mikuni VM26 69-81 Z50 CT70 and 73-80 ATC 70 3 speed](https://tboltusa.com/store/tbparts-vintage-roller-rocker-race-head-v2-108cc-big-bore-mikuni-vm26-69-81-z50-ct70-and-73-80-atc-70-speed-p-2095.md): part number `TBW9119`; $902.99 USD; 2 left

Stock: "in stock" = 9 or more, a number = that many left, "out of stock" = cannot be ordered now. "options" = choose options on the product page before it can go in the cart. Product links go to the markdown copy; for the web page change the ending .md to .html.

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