ive started green laning on the ttr I bought and fixed up last year, and firstly wow what an awesome bike, I’m having a lot of fun on it. on the last 2 rides I have noticed a slight oil leak from the RH (clutch) side of the engine butni cannot pinpoint the cause. It’s pretty minor, dropping from the max fill line to halfway between max and min over a full day riding but nonetheless not a good thing.
ive attached some pictures of before I cleaned it today which shows the difference in dirt where the oil has leaked, I tried cleaning it and then running the bike at idle and nothing was obviously dripping or leaking but from the area the oil has covered i‘d say it’s leaking when under pressure/load.
I wondered if anyone had any ideas of where this could be coming from?
-- Edited by deefer on Sunday 2nd of June 2024 11:01:59 PM
If you wash it all off, then spread some talc or flour around and go for a ride I think you'll find the leak quite quickly as it warms up.
Hopefully it is not the base gasket (because it is the most effort to fix). Other possibilities are the oil feed banjo copper washers as Jeff is suggesting, copper washer for the oil filter housing bleed screw, O rings in the oil filter cover or a break in the clutch cover gasket. Copper washers go hard and need replacing or re-annealing to soften them up so they seal again once disturbed.
Given the amount of oil high up on the casing I don't suspect the oil cooler plug bolts.
