ATHENA Oil Seal 12x18x5 mm for YAMAHA TTR 110 and APRILIA PEGASO 650 1992-2022

On YAMAHA TTR 110 and APRILIA PEGASO 650 from 1992 to 2022, the ATHENA 12x18x5 mm M730900249003 oil seal fits in place of the original part. Sold by size, this oil seal replaces a worn seal on an engine, water pump, shift, kickstart or hub shaft, as long as the dimensions match. Its lip rubs on the shaft all the time: with heat and hours of use, it hardens and eventually leaks.

Specifications

• Brand: ATHENA
• Manufacturer part number: M730900249003
• EAN code: 8051757028139
• Rubber-covered outer case
• Profile: TC
• Engine: 4-stroke

When to replace it?

• Oil weeping or leaking around the shaft.
• Lip hardened, cracked or turned over when you take the seal out.
• A groove worn into the shaft where the lip runs: the new seal must sit on a clean, undamaged surface.
• On a two-stroke, a crankshaft seal that lets air in makes the idle unstable and leans out the mixture.

Replace an oil seal as soon as it leaks, and always whenever you remove it: once a lip has come out of its housing, it never seals properly again. Note the three dimensions marked on the old seal (for example 20 x 32 x 7) or measure the shaft, the housing and the thickness with a caliper.

Fitting tips

1. Drive out the old seal with a seal puller or a screwdriver with a protected tip, without scratching the housing or the shaft.
2. Clean the housing and check the shaft: a scratch or groove under the lip will make the new seal leak.
3. Lightly oil the lip or smear it with grease, then drive the seal in perfectly square with a socket that presses on its outer edge, lip (spring side) facing the oil.
4. Protect the lip from splines, threads or keys as the shaft goes through (adhesive tape or a thin sleeve).

Why ATHENA?

Founded in 1973 near Vicenza, Athena is an Italian engine gasket specialist that has made its gaskets on its own production lines since day one, as well as a renowned manufacturer of pistons and cylinder kits. The brand supplies original equipment to manufacturers such as KTM, Ducati, Fantic, Piaggio and Triumph, and is a partner of the MXGP motocross world championship.

Spare parts and items to plan

• Grease : MOTUL 400 g

Frequently asked questions

How do I read an oil seal size?
In this order: inner diameter, outer diameter, thickness, in millimetres. A 20 x 32 x 7 seal fits a 20 mm shaft in a 32 mm housing and is 7 mm thick.

NBR or FKM (Viton)?
NBR (nitrile rubber) suits most uses. FKM handles heat better: it's the right choice near the crankshaft or the water pump. The material is listed in the specifications when it is known.

Why would a new seal leak?
Most of the time the shaft is marked under the lip, the seal went in crooked, or the lip folded over as the shaft went through.

Compatibility

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

Fits:
APRILIA PEGASO 650 1996
APRILIA PEGASO 650 1995
APRILIA PEGASO 650 1994
APRILIA PEGASO 650 1993
APRILIA PEGASO 650 1992
YAMAHA TTR 110 2022
YAMAHA TTR 110 2021
YAMAHA TTR 110 2020
YAMAHA TTR 110 2019
YAMAHA TTR 110 2018
YAMAHA TTR 110 2017
YAMAHA TTR 110 2016
YAMAHA TTR 110 2015
YAMAHA TTR 110 2014
YAMAHA TTR 110 2013
YAMAHA TTR 110 2012
YAMAHA TTR 110 2011
YAMAHA TTR 110 2010
YAMAHA TTR 110 2009
YAMAHA TTR 110 2008