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TB Parts

51MM Stroker Crank Honda 3 Speeds - 69-79 CT70 & 68-81 Z50 TBW0622

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  • $ 179.99
1 review

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FITS 69-79 HONDA 3 SPEED CT70's & 68-81 3 SPEED Z50's
- 51mm Crankshaft with NTN bearings
Stock oil pump shaft is to large in diameter.
TBW0225 oil pump drive shaft is a smaller diameter than stock and therefore, the stroker crank clears it. 

6v Motors
Turns 88cc into 108cc
Must also use modern 12v type piston with this crank for proper clearance
Measures 57mm from gear to the end of the crank.


We highly recommend a professional technician install this kit. If you plan on installing the kit yourself, you will need to have a Clymer or Honda shop manual.
Instructions do not come with the kits but the installation of the crankshaft is just like installing a stock Honda crankshaft and both manuals cover this.

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Paul B.
Australia Australia

Very happy with the item, Great customer service, Would highly recommend.