Oversize Bore Up Yamaha V80

piston kit NPP

The average piston manufacturer standards - average only provide up to 100 alias oversized 1 mm larger than the standard. When the motor is oversized 100, usually have to go back to the standard dressing gentlemen liner or bore up with the larger piston. Here I only share about Yamaha V80 oversized old school belonging and its difficult to find spare parts.
At Yamaha V80, Yamaha factory only provides std size piston, 25, 50, 75, and 100 only. Well, my V80 piston motors now been scratched because of lack of lubricating oil side. Once I thought - thought, might as well bore up small - piecemeal here the motor in order to reduce the cost.
What is required is a standard block Kolter turner. For the rest of the liner thickness is still within safe limits for the daily. Do jetting nozzle so as not to dry again. The capacity is now 84.2 cc engine (piston oversized 150) and 86 cc (oversized piston 200).
To note is the height rinse holes and hole diameter exhaust is getting changed when enlarged. Suggestion to change the height of the hole again to power the engine is not restrained.