[Manga]

Turns out I dont think this is unburt fuel now.

One mate thinks its a valve stem seal.

So, I may have a stem seal damaged as the bike is smoking on part throttle.

Does anyone know if the stem seals can be changed without taking the cylinder head off?

I don't have an exploded drawing showing the arrangement.

If the stem seals are pressed into the valve guides then I would think the head has to come off.