WÖSSNER Connecting Rod Kit for KAWASAKI KX 125 1978-1993

The WÖSSNER P2037 connecting rod kit is designed for KAWASAKI KX 125 from 1978 to 1993. The connecting rod links the piston to the crankshaft and takes the most violent loads in the engine. Its big-end bearing and crank pin wear over the hours: play at the big end is the warning sign of a failure that can wreck the whole engine.

Specifications

• Brand: WÖSSNER
• Manufacturer part number: P2037
• Engine: 2-stroke

When to replace it?

• Vertical play at the big end at top dead centre.
• Side play out of tolerance, signs of overheating (bluing).
• Vibration and dull noise from the bottom end.

During a bottom end rebuild, at the intervals in the service manual, and without delay as soon as play appears at the big end.

Fitting tips

1. Replacing a connecting rod means pressing the crankshaft apart and then realigning it: with a dial indicator, you check the run-out, i.e. the deviation in rotation measured at the end of the shaft, which must stay within a few hundredths of a millimetre at most. Leave this job to a properly equipped workshop if you don't have a press and a truing stand.
2. Replace the crankshaft bearings and oil seals at the same time.
3. Check the big-end side play after assembly.
4. Close up the engine with a complete engine gasket kit and tighten to the manufacturer's torque.
5. Check the gearbox bearings, then fill up with fresh oil and fit a new spark plug.

Why WÖSSNER?

A German brand created by former racer Eckart Wössner, Wössner has been designing and forging its own pistons since 1994. These pistons are built for racing and are now used by Supercross, Arenacross and MXGP teams.

Spare parts and items to plan

• Crankshaft bearings and seals : see the selection
• Complete engine gasket kit : ATHENA · CENTAURO
• Gearbox bearings : HOT RODS TBK0032 · HOT RODS TBK0033
• 2-stroke oil : LIQUI MOLY 1 L · MOTUL 1 L
• Spark plug : NGK · NGK R6252K

Frequently asked questions

Can I fit the connecting rod myself?
Yes, if you have a press and a crankshaft truing stand; otherwise, an engine workshop can do it for you.

What else should I plan for?
The crankshaft bearing and seal kit, the complete engine gasket kit, the gearbox bearings if required, engine oil and a spark plug.

Compatibility

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

Fits:
KAWASAKI KX 125 1993
KAWASAKI KX 125 1992
KAWASAKI KX 125 1987
KAWASAKI KX 125 1986
KAWASAKI KX 125 1985
KAWASAKI KX 125 1984
KAWASAKI KX 125 1983
KAWASAKI KX 125 1982
KAWASAKI KX 125 1981
KAWASAKI KX 125 1980
KAWASAKI KX 125 1979
KAWASAKI KX 125 1978