WISECO Garage Buddy Complete Engine Rebuild Kit for YAMAHA WRF 250 2003-2004

On YAMAHA WRF 250 from 2003 to 2004, the WISECO Garage Buddy WPWR141-100 complete engine rebuild kit fits in place of the original part. Rebuilding an engine takes dozens of different parts. This kit gathers them for a complete rebuild, from the crankshaft to the piston, with the gaskets and oil seals.

Key features

• Contents: Wiseco forged piston kit, timing chain, crankshaft and con-rod assembly, crankshaft bearings, gaskets and oil seals.
• Wiseco hour meter supplied with its mount.

Specifications

• Brand: WISECO
• Manufacturer part number: WPWR141-100
• Compression ratio: 12.7:1
• Weight: 5.27 kg
• Engine: 4-stroke

When to replace it?

• Engine due for its rebuild hours, bottom end included.
• Bottom-end noise, con-rod play or a tired crankshaft.
• Loss of compression and power.
• On a four-stroke: oil consumption and blue smoke.

The contents are listed in the specifications. A complete rebuild needs the right tools (pullers, a way to heat the crankcases, measuring instruments): have a workshop do it if you're not equipped.

Fitting tips

1. Strip down and clean the whole engine; measure the cylinder, dimensions and clearances as set out in the manual.
2. Heat the crankcases to remove and fit the bearings, pressing only on the race that is the tight fit.
3. Fit the crankshaft, close the cases with new gaskets and check that everything turns freely.
4. Fit the top end (piston, rings, gaskets) following the manual and torque everything to spec.
5. Fill up with engine oil and coolant, fit a new spark plug, then break the engine in gently for the first hour.

Why WISECO?

Wiseco forges and machines its pistons in Mentor, Ohio (USA), using forging tooling made in-house. A benchmark for forged motorcycle parts, the brand also produces valves, clutch baskets and clutch plates.

Spare parts and items to plan

• Spark plug : NGK
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• Gearbox oil : LIQUI MOLY 10W30 1 L · LIQUI MOLY 1 L
• 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50

Frequently asked questions

Is the kit enough for the whole engine?
It covers the parts listed in the specifications. Damaged parts that aren't included (gearbox gears, clutch, valves…) are ordered separately after inspection.

Does the cylinder need reconditioning?
Measure it: if it's out of tolerance or damaged, it must be reconditioned before you fit the new piston.

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
YAMAHA WRF 250 2004
YAMAHA WRF 250 2003