Yamaha YZF R125 engine rebuild parts

⚠️ Safety Warning: Rebuilding an engine requires mechanical expertise and precision. Ensure you use a torque wrench to meet the specific manufacturer settings found in the workshop manual. Improper assembly of engine components can lead to catastrophic failure and safety risks while riding.

Yamaha YZF-R125 Engine Rebuild Parts List

When rebuilding the YZF-R125 engine, using high-quality components is essential for longevity and performance. Below are the recommended brands and parts typically required for a full top and bottom-end overhaul.

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Core Rebuild Components

• Gasket Sets: NE brand gaskets are highly recommended for their reliability and consistent seal.

• Bearings: It is best to stick with premium industrial brands like SKF or Koyo for crankshaft and gearbox bearings.

• Oil Seals: New Athena oil seals should be fitted during every rebuild to prevent internal and external leaks.

• Pistons: Firefox pistons have a good track record for this model. Alternatively, genuine Yamaha pistons are ideal if sourced from a reputable dealer.

• Barrels (Cylinders): The standard practice is to rebore the existing barrel and fit an oversized piston for the best fit.

Direct Shop Links

• Gasket Sets: Buy YZF-R125 Gasket Sets on eBay UK

• Bearings: Shop SKF/Koyo Bearings for R125 on eBay UK

• Pistons: Find YZF-R125 Pistons on eBay UK

 Buy these on Ebay UK here 

I use either SKF or Koyo bearings 

                                            Buy these on Ebay UK here 

Athena Seals New oil seals need to be fitted on every rebuild                                                                           

 Buy these on Ebay UK here 

Ive had very good success with these piston from firefox but if you can find genuine on an auction then but them

 first.

 Buy these on Ebay UK here 

For barrels i always try to rebore and oversize piston.