5 Sped Box Are the I/P & O/P Seal Rings Identical?

[Old Jock]

So I ordered a seal kit from the UK spares people

I now have 2 seals that appear to be identical, brown in colour so probably Viton. Problem is Guzzi quote 2 different numbers for input (90403548) and output (90403547)

Size quoted is the same 35x47x7 but the input (Clutchshaft) is quoted as 35x47x7/6.5 whatever that's meant to mean

I'm wondering if it's safe just to put them in, as the differing part number relates to a different material, the input might see some heat but the output would not

Just confused and the last thing I want is to put it all together and then is starts to leak

[guzzisteve]

This is what I have experienced. They are not the same, front seal is normal placement of seal lip. The rear seal lip is closer to the bottom of seal to catch on the speedo drive spacer edge(or whatever it rides on).  If you use the same seal it will leak.
New bike learning from the 70's asking old dealers 'why'. There was no internet or forums.

[Old Jock]

Gotcha Steve

Thanks I'll get onto them tomorrow, if push comes to shove I can just keep the old one in, bike is low miles and no leaks.

I was in there to replace the dodgy nylon caged bearings and thought it would be prudent to do the seals anyway.

Aprreciated

John

[Guzzidad]

   I just recently had this same confusion, and Steve is right, they are not the same. But placement becomes obvious when you look at where the lip rides on the input and output.

[Old Jock]

TBH I thought that was the case, but wishful thinking got in the way

I also came across something somewhere that stated the Clutchshaft is a double lipped Viton type the Layshaft is just a normal common or garden single lipped seal.

Damm it all

The replies were much appreciated, thanks