INNTECK Crankshaft Oil Seal for SUZUKI RM 250 1996-2012

The INNTECK OS131 crankshaft oil seal is designed for SUZUKI RM 250 from 1996 to 2012. The crankshaft oil seal seals the point where the crankshaft comes out, on the ignition side or the clutch side. On a two-stroke, it keeps the crankcase airtight: a leak draws in air or gearbox oil, and the engine runs badly.

Specifications

• Brand: INNTECK
• Manufacturer part number: OS131
• EAN code: 41325099
• Engine: 2-stroke

When to replace it?

• Unstable idle, revs hanging or rising on their own.
• Gearbox oil level dropping, white smoke (clutch-side seal).
• Oil or black marks on the ignition side.

At every bottom end rebuild, and as soon as these symptoms appear.

Fitting tips

1. Drive out the old seal without scratching the housing or the crankshaft.
2. Grease the lip and press the seal in perfectly square, lip facing the inside of the engine.
3. Protect the lip as you slide it over the crankshaft thread or key.
4. Refit the cover with a new gasket.

Spare parts and items to plan

• Crankshaft bearings and seals : see the selection
• Ignition cover gasket : PROX · CENTAURO
• Complete engine gasket kit : PROX · CENTAURO

Frequently asked questions

Do the crankcases have to be split?
Not always: on some engines, the ignition-side seal can be replaced without splitting the cases. During a rebuild, replace it along with the crankshaft bearing and seal kit.

Compatibility

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

Fits:
SUZUKI RM 250 2012
SUZUKI RM 250 2011
SUZUKI RM 250 2010
SUZUKI RM 250 2009
SUZUKI RM 250 2008
SUZUKI RM 250 2007
SUZUKI RM 250 2006
SUZUKI RM 250 2005
SUZUKI RM 250 2004
SUZUKI RM 250 2003
SUZUKI RM 250 2002
SUZUKI RM 250 2001
SUZUKI RM 250 2000
SUZUKI RM 250 1999
SUZUKI RM 250 1998
SUZUKI RM 250 1997
SUZUKI RM 250 1996