Decide Whether Reboring a Two Cycle Engine Is Right
When your two-stroke engine has lost its power, consider reboring the engine. It may be cost effective and the power will definitely increase.
Contents
Steps
- Read "How to Decarbonize a Two Cycle Engine" and do what you can to regain the power like: decarboning the engine and muffler and and checking, adjusting or replacing the spark plug.
- Compare the cost of reboring to the cost of buying a new engine.
- Add to the cost the new piston and rings.
- Subtract from the cost of reboring that value of having a more powerful engine. This value is subjective and depends what you use the engine for.
- Buy the new, bigger piston and ring(s).
- Disassemble the engine and bring to the machine shop just the part that needs reboring. This will minimize your labor costs.
- Have the machine shop rebore the engine.
- Assemble the engine with the bigger bore, change any gaskets if necessary.
Tips
- You can rebore a two cycle engine just once.
Warnings
- When assembling the engine, be careful not to over-torque it. The four connecting rods are small in diameter somewhat weak at the threaded part and the bolts that connect the muffler to the exhaust port are also weak.
