Question about 1976 Honda CB 100
A fresh bore job should have a piston to wall clearance of .002"if its .005"then its boarder line,anything after that then bore to next size.
Posted on Mar 16, 2011
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Posted on Jan 02, 2017
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It's a pretty big job. You need to be competent (and confident) with tools as well as diagnosing and repairing gas engines. Without knowing the details of your scooter, the overview is this: 1) Remove the carburetor (if mounted to the cylinder), exhaust pipe, cylinder head, cylinder and piston. 2) Have the cylinder bored out** to provide the correct clearance between the cylinder and the piston (if different from the scooter manufacturer's clearance this information should be provided by kit manufacturer). 3) Modify the head (more machine work to reshape the combustion chamber to work with the larger bore). 3) Reassemble. 4) Modify the fuel system (usually a carburetor) to correctly fuel the now larger displacement engine. 5) Get the new set up running and then tune it to run properly without damaging itself from an incorrect fuel mixture.
** Some cylinders are aluminum with a steel sleeve that forms the bore that piston runs in. Some are aluminum with a thin nikasil coating on the aluminum bore. These will be much more expensive to bore out as they will need to have the coating replaced after being bored out.
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