ITALKIT Connecting Rod Kit for KTM EXC 125, SX 125, SX 144, SX 150 1998-2016

The ITALKIT BC.8670R connecting rod kit is designed for KTM EXC 125, SX 125, SX 144, SX 150 from 1998 to 2016. 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: ITALKIT
• Manufacturer part number: BC.8670R
• Centre-to-centre length: 110 mm
• Small end bore: 19 mm
• Big end bore: 28 mm
• Small end width: 15.9 mm
• Big end width: 15.9 mm
• Crankpin diameter: 22 mm
• Crankpin length: 55 mm
• Small end bearing: 15x19x20 mm
• Big end bearing: 22x28x16 mm
• Conrod thrust washers: 1 mm
• 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.

Spare parts and items to plan

• Crankshaft bearings and seals : see the selection
• Complete engine gasket kit : ATHENA · CENTAURO
• Gearbox bearings : HOT RODS TBK0018 · HOT RODS TBK0102
• 2-stroke oil : LIQUI MOLY 1 L · LIQUI MOLY 4 L
• Spark plug : NGK 2707 · NGK 3006

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:
KTM EXC 125 2016
KTM EXC 125 2015
KTM EXC 125 2014
KTM EXC 125 2013
KTM EXC 125 2012
KTM EXC 125 2011
KTM EXC 125 2010
KTM EXC 125 2009
KTM EXC 125 2008
KTM EXC 125 2007
KTM EXC 125 2006
KTM EXC 125 2005
KTM EXC 125 2004
KTM EXC 125 2003
KTM EXC 125 2002
KTM EXC 125 2001
KTM EXC 125 2000
KTM EXC 125 1999
KTM EXC 125 1998
KTM SX 125 2015
KTM SX 125 2014
KTM SX 125 2013
KTM SX 125 2012
KTM SX 125 2011
KTM SX 125 2010
KTM SX 125 2009
KTM SX 125 2008
KTM SX 125 2007
KTM SX 125 2006
KTM SX 125 2005
KTM SX 125 2004
KTM SX 125 2003
KTM SX 125 2002
KTM SX 125 2001
KTM SX 125 2000
KTM SX 125 1999
KTM SX 125 1998
KTM SX 144 2015
KTM SX 144 2014
KTM SX 144 2013
KTM SX 144 2012
KTM SX 144 2011
KTM SX 144 2010
KTM SX 144 2009
KTM SX 150 2015
KTM SX 150 2014
KTM SX 150 2013
KTM SX 150 2012
KTM SX 150 2011
KTM SX 150 2010
KTM SX 150 2009