Alan See­ley 1975 Moto Morini 31/2 Sport

Float nee­dle valves and float heights: get them right (if you find the time)

Practical Sportsbikes (UK) - - News -

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, del­ Nik’s Euro Bits­ro­bits

“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

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