Is it essential to replace this valve?

[McCabe-Thiele (Ted)]

Before I grind in the last valve I am thinking this old damage might cause a problem.

It's not deep but it has gone throught the top surface of the valve in 4 places - I suspect in the past some plug porcelain or similar has done the damage.

Should I fit a new valve I'm hoping they are still available?

I'm unlikely to do more than 500 miles a year in reality over the next 4 or 4 years.

No 4 exhuast valve by Macabe Thiele, on Flickr

[taysidedragon]

Personally, I wouldn't use that one again. Source a new or good used valve to replace it.

[Athame57]

Steve at 400Four has got a selection of used valves... https://www.400fourbits.co.uk/#engine

[McCabe-Thiele (Ted)]

Steve at 400Four has got a selection of used valves... https://www.400fourbits.co.uk/#engine

I've sent an e-mail I wonder why he does not price his parts?

[Athame57]

Steve at 400Four has got a selection of used valves... https://www.400fourbits.co.uk/#engine

I've sent an e-mail I wonder why he does not price his parts?

Maybe he is shrewd and checks for availability elsewhere!