I have placed an order for multiple Honda OEM oil seals but find the one for the countershaft (front sprocket) are not available. So i am ordering on-line. Oils seals available in this size (25x45x7) are nitrile rubber. This is adequate for oil compatibility but the temperature range goes to a high of 100 degrees C. Is this temperature rating adequate?

What are OEM Honda seals made of?

Vitron seals are oil resistant and have a much higher temperature range but i haven't found any yet.
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MC21R9N track
MC18R2J track
CBR954
CR250

cangus wrote: Is this temperature rating adequate?

Yep, 100 Celsius degrees is adequate enough.

cangus wrote:
What are OEM Honda seals made of?

Dunno... but I do use viton seals for myself.
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2t-racelab.com

What model? MC18 I'm not sure about but i recently got that seal from Honda for my MC21.

Got a countershaft and a gear selector seal for my mc18 r2j over the counter at a honda shop here in Aus. Check the part number on David Silver Spares, will tell you a new part number if the old one has been superseeded.

Yes David Silver Spares has them. Thanks. Now to find out what shipping will be for a $10 part. It's the shipping that kills you.

Seems no one stateside has them. i'm guessing this part does not cross over into any USA models so not stocked or even recognized here. I went on multiple USA websites with no luck.

Still, it would be good to know what material Honda uses to substitute local manufacturer/source. If you go on an oil seal website you find multiple seal designs and multiple materials available. it can get very confusing.
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MC21R9N track
MC18R2J track
CBR954
CR250