I've used that 35mm film trick and it worked with a dirt bike.
Bugs and dirt get under those seals.
Actually a leaking seal never lose that much oil. I've known people that never replace leaking seals, they just top the oil off once a year. It makes a mess, but the actual amount of oil lost often very minimal.
Owned a 73 Triumph years ago with leaking fork seals and I never fixed it. I would just add oil like once a year, maybe a couple ounces if that much would top it off, that after riding the bike all summer, it sure would make a mess.
The film trick works well, I've heard like 95 percent of the time that will fix it. Its not a temporary fix as someone mention, it's just dirt or bug guts on the seal is all.
Last edited by sonicboom; 04-24-2017 at 04:08 PM.