# Big Bore and Engine Kits

> 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 K0-K2 HARDTAIL](https://tboltusa.com/store/honda-vintage-mini-bike-parts-z50-k0-k2-hardtail-c-101_1123.md) > Big Bore and Engine Kits
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/z50-k0-k2-hardtail-big-bore-and-engine-kits-c-101_1123_1125.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/z50-k0-k2-hardtail-big-bore-and-engine-kits-c-101_1123_1125.md)
- **Generated:** 2026-11-04 04:56 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=1125`

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 and Controls](https://tboltusa.com/store/z50-k0-k2-hardtail-bars-and-controls-c-101_1123_1124.md)
- [Brake Pads and Parts](https://tboltusa.com/store/z50-k0-k2-hardtail-brake-pads-and-parts-c-101_1123_1126.md)
- [Carbs and Kits](https://tboltusa.com/store/z50-k0-k2-hardtail-carbs-and-kits-c-101_1123_1127.md)
- [Clutch Kits and Parts](https://tboltusa.com/store/z50-k0-k2-hardtail-clutch-kits-and-parts-c-101_1123_1128.md)
- [Electrical](https://tboltusa.com/store/z50-k0-k2-hardtail-electrical-c-101_1123_1131.md)
- [Engine Covers and Dress up parts](https://tboltusa.com/store/z50-k0-k2-hardtail-engine-covers-and-dress-up-parts-c-101_1123_1129.md)
- [Engine Parts](https://tboltusa.com/store/z50-k0-k2-hardtail-engine-parts-c-101_1123_1130.md)
- [Exhaust](https://tboltusa.com/store/z50-k0-k2-hardtail-exhaust-c-101_1123_1132.md)
- [Frame](https://tboltusa.com/store/z50-k0-k2-hardtail-frame-c-101_1123_1135.md)
- [Front Forks](https://tboltusa.com/store/z50-k0-k2-hardtail-front-forks-c-101_1123_1134.md)
- [Pegs and Mounts](https://tboltusa.com/store/z50-k0-k2-hardtail-pegs-and-mounts-c-101_1123_1137.md)
- [Seats and Tanks](https://tboltusa.com/store/z50-k0-k2-hardtail-seats-and-tanks-c-101_1123_1133.md)
- [Sprockets and Chains](https://tboltusa.com/store/z50-k0-k2-hardtail-sprockets-and-chains-c-101_1123_1138.md)
- [Wheels and Tires](https://tboltusa.com/store/z50-k0-k2-hardtail-wheels-and-tires-c-101_1123_1136.md)

## Products

Showing 1 to 11 of 11 products (page 1 of 1).

- [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 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; 2 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; 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 - 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.

## Navigate

- Up one level: [Z50 K0-K2 HARDTAIL](https://tboltusa.com/store/honda-vintage-mini-bike-parts-z50-k0-k2-hardtail-c-101_1123.md)
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