Announcement: During this time of national emergency and crisis TBolt USA will remain open and continue to fill paid internet orders placed on the website.
Please expect some delays in filling orders as we are running a skeleton crew
Please Read More Here

Big Bore & Engine Kits

Show: 

.TBParts - 88cc Big Bore Kit <br> for Z50 CRF50 XR50 1988-Present1
Buy Now

.TBParts - Manual Clutch kit <br> Z50 CRF50/70 XR50/70 & Pit bikes1
Buy Now

.TBParts - Roller Rocker Race Head V2 108cc Big Bore Kit <br> Z50 CRF50 XR50 & Pit bikes1
$699.00
$594.15
Buy Now

.TBparts - Roller Rocker Race Head V2 88cc Big Bore Kit <br> Z50 CRF50 XR50 & Pit bikes w/ Mikuni VM26 Carb1
$729.00
$619.65
Buy Now

.TBParts - Roller Rocker Race Head V2 Kit for 88cc & 108cc <br> Z50 CRF50 XR50 & Pit bikes1
$499.99
$424.99
Buy Now

.TBParts 88cc Big Bore Kit, Race Cam and 20mm Carb Kit <br> for Z50 CRF50 XR50 88-Present1
Buy Now

AHP 4 Speed tranny <br> Z50 CRF50 XR50 & Pit bikes1
Buy Now

All Balls - Crankshaft Bearing - Honda 50s, 70s, XL/XR75, XL/XR801
Buy Now

EBC - Redline Clutch Kit for CRF50/701
Buy Now

TBParts - 117cc Race Head V2 Kit for CRF50 XR50 Z501
$699.00
$594.15
Buy Now

TBParts - 54mm Big Bore Kit w/ Race Head V2 kit and Stroker Crank for 69-79 Z501
$699.00
$594.15
Buy Now

TBParts - 54mm Bore Kit w/ Stroker crank, V2 Race Head and Mikuni VM26 Carb Kit for 69-79 Z501
$859.00
$730.15
Buy Now

TBParts - H-D Auto Clutch Kit  69T<br> Z50 CRF50 XR50 ATC70 & Pit bikes1
Buy Now

TBParts - Honda 50 Gasket Kit plus Oil Seal Kit1
Buy Now

TBParts - Magnetic Oil Drain Bolt - <Br> XR50 CRF50 CRF70 KLX110 & Pit Bikes1

TBParts - Manual Clutch Kit Billet Housing Upgrade1
Buy Now

TBParts - Oil seal and O ring kit<br> CT70 , Z50 , XR/CRF 50/70 China 50-1601
Buy Now

TBParts - Race Head Kit for 88cc <br> For Z50 CRF50 XR50 & Pit bikes1
Buy Now

TBParts - Race Head, 88cc Big Bore and 20mm Carb Kit <br> for Z50 CRF50 XR50 CRF701
Buy Now

TBParts - Stock Shift Shaft - Z50 XR50 CRF50  XR70 CRF70  - 1988 - present1
Buy Now

TBParts - Stroker kit 1 108cc <br> for Z50 CRF50 XR50 CRF701
Buy Now

TBParts - Stroker kit 2 108cc <br> for Z50 CRF50 XR50 CRF701
Buy Now

TBParts - Stroker kit 3 108cc with Race Head <br> for Z50 CRF50 XR50 CRF701
Buy Now

TBParts - Stroker kit 6 117cc <br> for Z50 CRF50 XR50 CRF701
Buy Now

Displaying 1 to 24 (of 28 products)