Inside the Cucciolo

2 Мар 2015 | Author: | Комментарии к записи Inside the Cucciolo отключены

Inside the Cucciolo


How to get there and what to do when you

The Ducati Cucciolo shares few other cyclemotors the distinction of a cycle. It is almost certainly in that it has pull rods. As if were not unusual enough it a two speed pre-selector gearbox by pedal position for the progressively or, for traditionalists, a visible gear (one guinea extra).

If have character, and most would probably concur, the provides it in full measure. My notes contain a paragraph Steadfast in Perversity alongside a showing a back wheel into a figure of eight.

In the rampant expansionism led to a second for our Midlands family and a late Four, a Rudge Ulster, a Manxman and a Mk VIII KTT, all for a few of pounds in that golden age bother to ask, all but the Squariel gone). Myself, I went for a for three pounds ten, arrived in a box, wooden, of a steam driven British Inevitably, it was minus the crucial tank, cranks and special bracket spindle.

These remained in Fenland, adorning one of large black upright that the natives of those seemed to ride permanently at 45 degrees into the prevailing The engine itself adorned a in the garage for the next twelve One day in 1978 it was persuaded to run by the rather expedient of holding the rim of the outside against the rotating back of the current Red Hunter.

Another years on, thanks to Michael then living in Essex and in of all the missing bits, it could be put on a

First there was a taster for might be: at one of Colin Packman’s events Roger Worton me with his and it was all the impetus that was to begin installing Cucciolo onto the 1933 Royal The Enfield had been bought by my when it was nearly new, newish, because we were a who seldom paid full for anything if we could possibly it.

It had endured the worst that could do in the Birmingham Blitz and to be serially abused by a variety of and the next generation. This, its Power Pak flattened seat was to be the host for yet another mechanical

I believe that there instinctive mechanics with an eye for and capable hands. Sadly number does not include me and the that follow are intended for of my fellows who learn as I did, the way, in the hope that might avoid the same

It is a fact that very few new or second-hand, exist for the Cucciolo and the bits are often difficult to This is no great problem for engineers with well workshops but presents the rest of us serious difficulties since it is the same bits which out and we are trying to revive in the 21st what 1950s owners as beyond economic resuscitation.

The Cucciolo owner will carefully the amount of thread above the rocker on the exhaust will be suspicious of a flywheel too much travel either of TDC on the firing … and will at the weakness of the spark (if any) as the flywheel is rotated, with the removed, by a 14mm socket by a electric (variable speed) Further, he or she will draw conclusions from an alloy whose internal toothed is pointy in parts and prone to Is it not indicative of much pedalling, no Cucciolo owner would do it is hard work indeed.

Before fitting my engine, it prudent to take a look at the there did not seem much It was at this point, 15th May that a Miracle occurred in East Wales. A tiny valve collet leapt space, heading for the garage was found again. Much objects had disappeared forever those spider haunted

Reassembly completed, would it It would not. Years of had … the coil. Exceptionally, an coil will perform most do not.

They of course, be rewound and may or may not perform but it is not cheap and there is an inexpensive recommended to me by Richard Rosenthal, is to convert to coil ignition. a 6V 10Ah sealed battery you can on 80 — 100 miles at least, is enough for most runs. In a hand lantern battery do.

The spark is like forked and a first time start is In 1989, the choice was to rewind the an eye watering £50. The long-suffering had a Sturmey-Archer hub. A fixed gives engine braking and a complex starting routine but not the six of a variable hub (three on the SA, times two on the

It may not be well known, but between top and on a three-speed SA is a neutral position in the pedals rotate without If that position is found and top selected on the engine then Cucciolo can be kick-started with the like a real motorbike. is what was done, but in my excitement it fired up I allowed my trigger to relax on the gear change.

was very unfortunate and had four results: the bike sprang the back wheel assumed the figure of eight, the hub gave up the and I said one of the words my mother so deplored and which had been in the Air Force. After that a clamp was fabricated, but you can of course off with your SA in bottom, in top, then when you achieved flying speed it safely, valve lifter

Inappropriately, it was on Armistice Day that resumed. The new wheel and its fixed had cost a modest £23. the aid of the adjacent Judges Pitch rising to 1:6) sufficient should be provided.

It was, but as the crossroads drew nigh the was held out and a few turns of the pedals to the struggling motor. It is a pre-selector and in half a dozen twirls I gear as many times and the sprocket, lock ring and chewed its way off the nice new hub and sat forlornly on the I bore it home, hung it on the wall and went racing for a

My machine was a Ducati 250. It had of the capacity to frustrate of its smaller but like the Cucciolo, it came in the end.

The Technical Bit

Let us assume a engine is before you. You negotiated successfully and brought prize home, or perhaps it was a shed discovery. It still with cyclemotors but apparently frequently nowadays with 3 Bentleys, which require garage shelves to accommodate.

The guide to installing and running is the one available from the NACC but which does not deal dismantling. There are other of information in the same resource are very useful, like the list. The one I have seen is in which, thanks to the Romans, is a lot unintelligible to Little Englanders some European languages.

The NACC’s Ducati Marque David Casper, has an encyclopaedic of the Cucciolo and its vagaries.

Rotating the by hand gives an idea of any that might be present and the spark checked with the socket in the drill referred to It is usually worth, in the absence of a running a file or emery the points and trying again.

like Independent Ignition will test a coil. removing the flywheel, it is suggested the valve timing be checked the rockers set at .006 inlet. 008 Take a piece of A3 paper and the long side mark out 36 divisions.

This will neatly when cut into a strip 10mm wide the rim of the flywheel with 0/36 coinciding at the M mark which is It can be secured with Sellotape. checked that both are closed it is easy to rotate the noting the points at which the open and close. Standard is as follows:

Inlet opens 5 15 degrees before top …

Inlet closes 25 — 30 after bottom … (180)

Exhaust opens 45 35 degrees before bottom centre

Exhaust closes 0 20 degrees after top …

Only one of the half dozen I have worked on came within these parameters. It is a idea to check that the open coincident with the a on the flywheel when gapped at Reset the motor to TDC on the compression undo the tappet lock-nut and its nut to the rocker and put each in a separately container.

Undo the acorn at each end of the rocker shaft and the order of shims and washers and the end of the shaft and its adjacent pillar for Examination of the shaft usually ridging and wear so if unworn, you might have a little motor or a careful previous The 4 × 10mm nuts on the base can be undone and removed, but the may have to be lifted slightly to the lowest fin.

Lift the head and barrel clear of the and lay aside. The big end can now be checked for vertical and the piston removed, marking the inside of the skirt with an F. The is lubricated by splash as the whirling dip into the meagre half of oil in the sump and distribute its contents the interior. You may even find the odd pin circlip in there if you failed to the piston in a cloth.

The valves can now be using the stail of a hammer in a vice with the valves thus whilst the collars are with pliers and collets The presence of an assistant to extract the obviates the need for miracles. It is to consign these parts to the marked containers.

Valves and can now be examined; the valves are of very material which is why frequent grinding in extreme cases the seats clean through the ‘skull’ into the alloy beyond. This is evidenced by the thread showing above the referred to previously.

A bar through the end eye bearing on two strips of wood the crankcase mouth enables the LEFT HAND THREAD nut holding the flywheel to its keyed shaft to be removed. Conveniently, the thread in the flywheel seems to be to that of a cotterless cycle extractor and the flywheel usually quietly. If the Woodruff key has not quitted the of its own accord, remove it.

You now have a view of all the electrics and for the record it is worth noting the of disassembly, though that can be until later since it all off with the lid. Oil on the electrics the felt crankshaft oil seal has and this can be replaced with a garter type (15-30-7 51).

The ‘lid’ or left crankcase is held with a of cheese head screws all the length bar two, which drilled heads and went side of the clutch cable so they could be wired and a seal affixed so Mr Ducati know if his engine had been with in the guarantee period. all the screws removed, the lid can be eased up the clutch cable has been from the clutch arm.

The from the outer races of and camshaft can then be heard into the void to join any Look for the missing ones the gear wheels later. If you to avoid a lot of trouble make the crank is at TDC and mark the relative of camwheel and crankshaft pinion the faithful Tippex.

Note the camshaft has an arrow on its periphery significance eludes me because I am not an Mechanic, and which can be ignored the valve timing has been As you lift out the camshaft, its needle can be heard tinkling in to join the The clutch can then be lifted out as an Remove the short push-rod it disappears and note carefully the of any shims and thrust washers.

reassembling it is vital that is a washer between the clutch and the uncaged rollers of the outer At this point most of the can be retrieved. It is as well to leave the sprocket assembly in place as prevents end movement on the gear and the puzzling appearance of three bearings whose function is later. Examine the various teeth for rust, pitting or

The clutch inner bearings are the itself, similar to the Mosquito but seldom show signs of

Removal of the crankshaft assembly

To the crank undo the four 8mm having released the tabs them and then the slotted on the drive side forward of the sprocket. Insert a suitable rod or alloy recommended) and drift the until it can be lifted clear. of the main bearings can now be considered.

Bearings of Sedgeley did at one time do a big end and obtaining replacement mains no difficulties in recent years.

usually, is as far as dismantling needs to go, but for the of completeness, I will describe the and selector mechanisms. The gears are by the movement in and out of a rod to which is attached an steel selector fork. are three circumferential grooves in the rod in a spring-loaded ball sits as the rod in and out. The end of the rod is visible outside the in is bottom, fully out top and halfway

Unless there is a malfunction gear selection the adjusters the right hand hexagon on top of the cases should be left If the slip sprocket assembly its left hand threaded peg has been removed then, as earlier, there is enough end to allow the three balls to out of the gear shaft whose it is to act as ‘dogs’ engaging with in the gear wheels. DO NOT retain with grease — need to be free to float in the

Both first and second are so driven and are retained by a circlip. left behind are the cam followers their support block and plate; again these do not require to be removed-replacement can be fiddly. At point the cases can be washed out or usually scrubbed out with a because of their treacly — a testimony to the parsimony of predecessors.

Reassembly, as the books is in reverse order of dismantling; as disingenuous as owners are recommended to the unit to the maker’s service . However, if you have wittingly or lost the timing of the valves, on.

Timing of valves when timing lost

Undoubtedly is a quicker and better way, but seems to work well

Fix a degree disc to the flywheel or use the A3 strip method above.

Fit barrel, all rocker gear. tappets slack.

It is easier to the crankshaft oil seal in the ‘lid’

Fit the rollers to the camshaft. They can be by grease or by the more elegant Method of viscous engine oil

When offering up the camwheel to the point the lobes towards the at which the arrow on the periphery point to approximately 3 o’clock

the rockers to running clearances.

Fit the to the camshaft outer race in the

Place a ruler on a line by the camshaft centre and the arrow on the Mark the point at which the crosses the right hand of the crankcase. Number it 1. This you to track the successive trials the correct setting.

Fit the lid and secure it two or three screws.

Refit the key to the main shaft and put a dab of Tippex on the end (makes it easier to see when up the flywheel.)

Ducati Cucciolo

Offer up the flywheel and it with the flanged nut finger

Align 0/360 degrees and with the timing mark on the

Rotate the flywheel clockwise and the point on the degree disc or where the exhaust valve to open — it should be degrees before 180 or bottom centre comes up on the scale.

if the point at which the exhaust opens is grossly out, the flywheel, take off the lid, and rotate the camwheel to, say, 2 or 4 and try again each time a new line on the case and numbering it as I have had as many as six goes.

the exhaust valve opens and at the correct points check the valve timing (standard was identified above). Since cams are fixed in relation to other it follows that the engine is badly worn timing will be correct In making any final adjustment it is to remember that inlet accuracy is more important exhaust since, in a four the outgoing gases look themselves.

Mark the correct pinion to pinion

Fit both of clutch rollers, ease the into position beneath the refit the oil seal.

Pour a generous measure of Calvados, the fire and switch on the telly.

le Cucciolo?

Now that your is back together, rejuvenated and for the road it is time to think getting under way. In the days, assuming a fixed cycle the rider would off and, having gathered and in doing so discovered how hard the Bs are to pedal, would raise the lifter, open the throttle a advance the right pedal and in the clutch.

A clunk and a slowing signified engagement and releasing the valve the engine would fire up and away in top close to stalling unless helped with the Slipping of the indestructible clutch is normal, while its drag do credit to a Velocette. The Cucciolista of course, the moment the engine advance the left pedal, the clutch and speed away in

It is not recommended to start in bottom the motor is thoroughly warm.

If you have a three-speed hub with useful gap between middle and top the described earlier can be used. and five speed hubs are not robust enough. A good will develop one and a half which is a lot more than people.

The infamous SW hub with its pawls can be guaranteed a short and sad Even the standard three AW has a lag before the drive is taken up and a gentle touch with the is needed. The ideal is the ASC fixed Sturmey language three-speed, close ratio.

These are and thus expensive variations mainly at those Veteran-Cycle jumbles which are a regular meeting place of certain of the fraternity, suitably disguised as The ASC gives engine braking as as nicely chosen ratios and shock loading as the drive is up. A derailleur can also be used, but derailleurs can be relatively expensive and

The writer once combined a three-speed with a fifties Cyclo Benelux conversion was popular with cycle of the period. This gave 18 which four hands required to operate. The six speeds a hub gives are more than with a bottom gear set will climb gradients as as the Test Hill at Brooklands and on a long gradient will in the highest ratios with a wind, a speed I will not credulity by quoting.

A more speed is a low revving 30-35 mph on a and take road.

All this is accompanied by the whine and wail of cut pinions and a chain that and snatches. Not restful but fun. On a day the Cucciolo feels as if it deserves its as the Lamborghini of Cyclemotors as you overhaul and leave behind more designs on a cyclemotor run, but an eye on the spokes and frame for breakages.

Hugh Gallagher or Alan on a run is rather like an open on a Manx Norton when else is on Bantams.

There is a magic yet in the name Ducati and some of the latter day aura of illustrious marque clings to its ancestor. This brainchild of an lawyer and engineer called Farinelli was born in wartime at a time when the Germans had their welcome. Their is said to have been the supply of the materials that the Little Pup its first bark.

By any Farinelli was a remarkable man and his genius on in the survivors of the 400,000 units If you have one of these little count yourself fortunate

Tailpiece — an update

One of the of bursting into print is you invariably get feedback or different Having gone into elaborate detail about the engine Hugh Gallagher Yes, all very well, and you can no do it that way, but why not use the arrow so provided by simply rotating the so that the arrow on the cam-wheel to the key-way on the crankshaft when the of the teeth can be highlighted and timing

However, it does involve manipulation to get the alignment. Both and Geoff Hudspith of Christchurch, pointed out the illogicality of valve recession with pull increasing the amount of tappet showing. Quite the reverse on and more likely, says to be the result of missing valve

Hugh said he found recession unusual but all I can say is that the I have must be more than his.

Geoff suggestion for loss of sparks is elegant. . I got over the problem by off the winding from the pole and winding on a replica of the lighting to give in effect a low tension This I led via the points and condensers in the way out to an external ignition coil of the fitted to Raleigh mopeds and It fitted very neatly out of under the down-tube mounted tank.

Ignition was quite enough for reliable starting and He goes on to say that a worn teeth can be unriveted and rotated to a where the pressure is least. He 1/8 rivets to refix.

Back to Gallagher: for those unfamiliar Hugh’s oracularity in regard to he has been running them the fifties and furthermore is an Engineer, is more than I am. Nor am I a roofer but another story altogether. He that a slipping or dragging could be due to weak springs he rectified by having new ones by Paul Savage, Unit 17, Workshops, 28 Hemming Road, Industrial Estate, Redditch, B98 tel: 01527-521666.

Clutch are 22mm long with an diameter of 12.75mm, wire 2mm and 7 turns. Valve springs Outer — 3cm long an outside diameter of 14.5mm, 1.7mm diameter, 7 turns; 18mm long by 10mm diameter with 1.7mm and 6 turns. Accuracy with the springs is important because, if too they can break the mazac on compression.

Finally, Hugh that it doesn’t matter you use grease or not on the ball recesses in the shafts, they work the same and at least they in place. He feels it is desirable to to the manufacturer’s design. Coils can be by Independent Ignition Supplies, Street, Appledore, Bideford, EX39 1PH

The last word from Dave Casper who that the little circlips the pull-rods designed to stop falling into the case are missing. An elastic band or a of insulation tape would this.

My thanks too to those who or wrote or otherwise told me they had enjoyed what was and particularly the people who have encouraged to tackle their as a result. That is reward

First published in three in June, August and December

Ducati Cucciolo
Ducati Cucciolo

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