Meant to post this while rebuilding my TTR but forgot ( must be my age)
I made a splash guard that fills the hole under the seat.
2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
Your seal is missing Locky, good idea with the slash guard though !
2004 TTR250 - Highway Dirtbike Hand Guards, 38mm Bar Risers, D606 Front & Rear, Opened up Airbox with Twin Air Filter, Re-jetted Carby, B+B Bash Plate & Frame Guards, DIY 3mm Alloy Tail Tidy, 14/47 Gearing.
Oh yes you are in fact correct, it is on the seat.
mine doesn't let in mud or water though, maybe your is damaged or compressed
Cheers
Steve
the seal on mine fell apart i fitted a bit of plastic
The seal as Mr Yamaha intended:
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