180 Jota Oil leak - Bad

[70sBeaver]

Would anyone know why my bike has sprung a leak. It seems to be coming from the RH side covers - gear selector side. I thought it was the crank case breather first of all, but after a brief hack this afternoon, it seems to be coming from the engine sprocket area? I removed the gear selector cover and it was full of oil, is this correct? The oil appears after 10 minutes of riding, normally when I have let it warm up and I just start to open it up a little. It covers the entire rear of the bike/mud guard/tyre/chain guard everything on the RH side. Assistance would be appreciated. also anyone know a really good guy in the Herts/London area I can take this to for work when needed.

 

[Grant]

Sounds like the seal on the output shaft (behind the drive sprocket) has blown.
I think the oil level should be below the lowest point when the engine is switched off, but once started the oil would soon spew out of the knackered seal area.
Assuming a series 1 180 then when you take off the small triangular plate (after removing the gear lever) there should be oil in there, where the outrigger selector drum thing lives.
You may have just blown a gasket where the sprocket cover sits but I would think the output shaft seal is your likeliest scenario.

 

[sfcpiet]

The gear selector lives in an oily environment, so far all is well.

All fixing bolts still present and tight?  How often have the gaskets been re-used?  Perhaps escaping from one of the gearbox oil seals?

Layshaft seal often springs a slight leak after considerable mileage, mainshaft also, but that is also often influenced by bearing wear.  

Seals can be replaced with engine in situ but it is a pain to get them in without damaging them.  The bores need to be chamfered a bit before attempting to install new seals.

piet