How to Decide Whether Reboring a Two Cycle Engine Is Right

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When your two-stroke engine has lost its power, consider reboring the engine. It may be cost effective and the power will definitely increase.

Steps

1. 1
   Read "How to Decarbonize a Two Cycle Engine" and do what you can to regain the power like: decoking the engine and muffler and and checking, adjusting or replacing the spartk plug.
2. 2
   Compare the cost of reboring to the cost of buying a new engine.
3. 3
   Add to the cost the new piston and rings.
4. 4
   Subtract from the cost of reboring that value of having a more powerfull engine. This value is subjective and depends what you use the engine for.
5. 5
   Buy the new, bigger piston and ring(s).
6. 6
   Disassemble the engine and bring to the machine shop just the part that needs reboring. This will minimize your labor costs.
7. 7
   Have the machine shop rebore the engine.
8. 8
   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 carefull 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.

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