Engine runs

No picture I’m afraid, but an update on engine progress. First runs a few weeks back proved the Aquaplane head did a good job of filling the bores up with water, so that has been set aside for a skim and re-fit at a later date. As it also seemed to be running hot, I thought it better to get it running right with the cast head. With no expansion tank in the cooling system, it was also too keen on blowing water out of the vent. For some reason it seemed to be running lean, so the jets were adjusted down, but no great improvement

An electric cooling fan and a Landover expansion tank grafted on, it was time to have another play with the carbs. Everything was checked, jets centred, the air slide dropping correctly but it was still not running too well. It seemed to have a nice high speed tick-over with the choke on even though the butterflies were fully closed. Just pondering where it could be drawing its breath from I put a spanner on the manifold to block bolts..............and yes, fancy not checking them when I fitted the carbs! Now running much better.  Will have a go at setting up the mixture with a colour-tune widget at the weekend. I don’t think the neighbours are so keen on hearing the exhaust note late evening as I am!