On Sat, 8 Mar 2008 09:42:47 -0000, Charlie Pridham wrote:

I guess you could also get overheating from an incorrect fuel air
mixture.

The pink valves indicate over heating but that normally affects exhaust
valves not inlet. Black deposits on the head stikes me as indication of
the mixture being a bit rich but that is contra indicated by hot valves
which are normally associted with the mixture being lean...

These carbs are horribly simple maybe idle is rich and running lean? They
can also be right beggers to set up if one of the jet adjusters has been
screwed in two hard and deformed the needle or seat...

I solved the problem by taking the mower to the dump and never buy
mountfield again!

Why single out Mountfield? The majority of non-honda engined stuff has B&S
engine...

--
Cheers
Dave.