How to Rebore 125cc Cylinder block enlarge piston housing. full process скачать в хорошем качестве

How to Rebore 125cc Cylinder block enlarge piston housing. full process

Reboring a 125cc cylinder block to enlarge the piston housing is a complex process that requires specialized tools and expertise. It is generally recommended to seek the assistance of a professional mechanic or engine builder for this task. However, I can provide you with a general overview of the steps involved in the process: Remove the cylinder head: Start by disconnecting any necessary components such as the exhaust system and carburetor. Then, remove the cylinder head bolts and lift off the cylinder head. Remove the cylinder block: Once the cylinder head is off, you'll need to detach the cylinder block from the engine. This may involve removing additional components like the cylinder base gasket and any retaining bolts. Secure the cylinder block: Place the cylinder block in a secure holding fixture or a specialized engine stand to ensure stability during the reboring process. Measure cylinder wear: Use a cylinder bore gauge or micrometer to measure the existing cylinder bore's diameter. This will help determine the amount of material to be removed during the reboring process. Select the appropriate piston size: Depending on the desired increase in piston size, select a piston that matches the new bore size. It's essential to choose the correct piston to maintain proper piston-to-wall clearance. Machine the cylinder block: Take the cylinder block to a machine shop equipped with a cylinder boring machine. The machinist will use the appropriate cutting tool to remove material from the cylinder bore, enlarging it to the desired size. Hone the cylinder bore: Once the cylinder block is bored, it needs to be honed to achieve the correct surface finish. Honing involves using a specialized honing tool to create cross-hatch patterns on the cylinder walls, promoting proper oil retention and piston ring seating. Clean the cylinder block: Thoroughly clean the cylinder block to remove any debris or metal shavings resulting from the reboring and honing process. Ensure all oil passages and coolant channels are clear. Install the piston and rings: Carefully install the new piston and rings into the cylinder block. Follow the manufacturer's guidelines for piston ring orientation and proper installation techniques. Reassemble the engine: Reattach the cylinder block to the engine, using new gaskets and torque the retaining bolts to the manufacturer's specifications. Reinstall the cylinder head and reconnect all the components that were removed. Test and break-in: After the engine is reassembled, it is crucial to properly break-in the new piston and cylinder. Follow the manufacturer's recommendations for the break-in procedure, which typically involves running the engine at varying speeds and loads for a specific duration. Remember, reboring a cylinder block requires precision and expertise to ensure optimal performance and longevity of the engine. It is highly recommended to consult a professional or experienced engine builder for this task