Alan Seeley 1975 Moto Morini 31/2 Sport
Float needle valves and float heights: get them right (if you find the time)
MODERN FUEL: when it comes to projects, it’s the little things that can cause you to lose momentum. A couple of years back I went at the Moto Morini 31/2 in a flurry of enthusiasm and the world’s longest-ever Sport restoration finally looked like it was headed for some sort of conclusion.
Then, while rebuilding the carbs, it transpired that I’d bought the wrong float valve needles. There are two sizes and, even with a 50/50 chance of getting it right, I’d ordered up the wrong ones online. I knew at the time that I was taking a risk but I’d be no kind of a bloke if I’d bothered to pick up the phone to make sure I was buying the right ones.
Anyhow, when I came to rebuild the carbs and realised my error, I initially thought I must just try and get away with refitting the original float valve needles but with concentric grooves worn in the Viton tips, that was plainly not going to work. Then I meant to get onto Eurocarb to return the float valves needles for exchange – but what kind of bloke gets around to that sort of thing either?
So all that was enough for me to put the carbs and indeed the whole bike to one side. Days turned into weeks and weeks into months and other projects took over. Then it became a year. When Big G and I found ourselves wandering around the Stafford Show at the end of April, struggling to find anything to spend our money on, I spotted a stall selling Dellorto spares. I explained my folly to the proprietor of Nik’s Euro Bits, presumably Nik himself, and he immediately knew what I was talking about. I gave him £14 and he gave me a ziplock bag containing the correct float valve needles.
So now I’ve been able to fit the needles, and to my immense satisfaction, checking the height of both revealed them to be at 25mm. For that purpose I used a 4in/10cm steel rule inherited from my dad.
With the carbs ready to go back on, work can recommence on the Morini and perhaps it will run this summer. Although it occurs to me that the ‘new’ cambelt will now be past its use-by date and ripe for replacement. Maybe next year…
CONTACTS Eurocarb 0118 9842811, dellorto.co.uk Nik’s Euro Bits stores.ebay.co.uk/niks-eurobits
“What sort of bloke actually bothers to pick up the phone to make sure?”
On the left: lovely and new. Right: old and trashed Delirious because his float height is BOB-ON