View and Download TB 88cc install instructions manual online. Big Bore Kit. 88cc motorcycle accessories pdf To install the big bore kit you will need. Return Instructions · Currently unavailable. We don't know when or if this item will be back in stock. · Highest quality materials. Precision fit. Exacting To install the big bore kit you will need to: 1. Stuff a CLEAN rag behind the piston to seal off the crankcase. 2. Install a c-clip into one side of Item #TBW0928 & TBW0226 TB Parts 88cc Big Bore Kit for Honda Z50/XR50/CRF50. All Years * Honda CRF50 All Years There are no installation instructions,