Workshop guide · Laverda · Breganze

Workshop guide classic Laverda

Maintenance of the classic Laverda twins and triples: shim valve clearance, ignition, carburettors and the four crankshaft layouts.

Nederlandse versie

Introduction

This guide covers the classic Laverdas from Breganze: the small overhead-valve singles of the fifties, the 750 twins, the 500 Alpino/Montjuic and the 1000/1200 triples. Laverda was known for robust, heavily built engines.

Models in brief

Small models: Motoleggera 75 (1949–1960), Milano-Taranto 75 and Tip Sport/Turismo 100 (1953–1960). Overhead-valve engine, three gears; with about 38,000 built a great success. Later came the 200 Bicilindrico (1962–1976).
650 and 750 twins (1968–1976): 650 GT, 750 GT, S, SF (SF1, SF2, SF3), GTL and the road-going racer SFC. SOHC parallel twin with 360° crankshaft.
500 Alpino, Alpino S, Formula 500 and Montjuic (1977–1984): DOHC twin with four valves per cylinder, 180° crankshaft and six-speed box.
1000 triples (1973–1988): 1000, 3C, 3CL, Jota, Jota 120, RGS. Until 1982 with a 180° crankshaft (outer pistons rising together), after that 120°.
1200 triples (from 1978): 1200, Jota America, 1200 TS, Mirage; the 1000 with an 80 mm bore.

The text is our own summary of public sources. The valve clearances come from the Laverda club forum and parts databases; for the rest follow the workshop manual or club documentation (such as that of the International Laverda Owners Club).

Technical data

The 750 twin and the 1200 triple share bore and stroke (80 × 74 mm); the 1000 has 75 × 74 mm.

Model	Years	Engine	Bore × stroke	Capacity	Compression	Carburettors	Power
Motoleggera 75 / Tip 100	1949–1960	1 cyl. overhead valve	—	75 / 100 cc	—	Dell'Orto	—
200 Bicilindrico	1962–1976	2 cyl. overhead valve	52 × 47 mm	200 cc	—	—	c. 11 hp
650 GT	1968	2 cyl. SOHC	75 × 74 mm	654 cc	—	Dell'Orto	—
750 GT / S / SF	1968–1976	2 cyl. SOHC, 360°	80 × 74 mm	744 cc	8.9:1 (SF)	2 × VHB 30, from SF1 2 × PHF 36	60–66 hp
750 SFC	1971–1976	same, racing	80 × 74 mm	744 cc	9,6–10,5:1	2 × Dell'Orto 36	70–75 hp
500 Alpino / Alpino S	1977–1980	2 cyl. DOHC 4 v., 180°	72 × 61 mm	497 cc	9.6:1 (S: 8.6:1)	2 × Dell'Orto PHF 32	c. 44 hp at 9500 rpm
500 Montjuic	1979–1984	same	72 × 61 mm	497 cc	10,2:1	2 × Dell'Orto PHF 32	c. 58 hp
1000 / 3C / 3CL	1973–1981	3 cyl. DOHC, 180°	75 × 74 mm	981 cc	9:1	3 × Dell'Orto PHF 32	78–85 hp
Jota	1976–1982	same, sport	75 × 74 mm	981 cc	10:1	3 × Dell'Orto 32	c. 90 hp
1200 / TS / Mirage	from 1978	3 cyl. DOHC	80 × 74 mm	1116 cc	—	Dell'Orto	—

Other features

750: Bosch electrics; early models a belt-driven 150 W Bosch dynamo and points, later an alternator and (SF3, SFC 1975) Bosch electronic ignition. Camshaft via chain, in large roller bearings.
500: crankshaft on four ball bearings, six-speed box, CDI ignition, 14-litre tank, dry c. 175 kg.
1000: Bosch electronic ignition, five-speed box, hydraulic clutch from c. 1980; Jota dry c. 246 kg.

Engine layout

On a Laverda the crankshaft layout determines how you set the valves and ignition per cylinder: which cylinders are at TDC together differs per model.

Laverda crankshaft layouts · piston position per cylinder, schematic

750 twin: SOHC with cam chain; the 650 started with 180° but became 360° before production. Both pistons move together, one on compression and the other on exhaust.
500: DOHC with four valves per cylinder, crankshaft on four ball bearings, 180°.
1000 (up to 1982): DOHC; outer pistons rise together, the middle one is opposed. Gives the typical uneven sound and the vibration.
Jota 120 and RGS (from 1982): crankpins at 120°, more even firing and smoother running.

On the 1000 watch the head: from 1976 to 1978 without hardened seats in the combustion chamber, with a risk of cracks and erosion around the valve seats.

Periodic maintenance

All Laverdas in this guide have a wet sump; clean oil is extra important for the roller and ball bearings of the 750 and 500.

Job	Interval (guideline)	Notes
Oil level	before every ride	sight glass or dipstick, bike upright
Change oil + filter	every 3000–5000 km or yearly	drain warm
Valve clearance	every 5000 km	engine cold
Cam chain	every 5000 km	sooner if it rattles
Ignition	every 5000 km	check points (early 750) or pick-up
Synchronise carburettors	every 5000 km	after valves and ignition
Spark plugs	every 5000 km
Lubricate and adjust chain	every 500 km	c. 20–25 mm slack
Brake fluid (disc brakes)	every 2 years	also hydraulic clutch (1000 from c. 1980)
Dynamo belt (early 750)	check every 10,000 km	belt drive Bosch dynamo

Oil: a good 20W-50 engine oil without friction modifiers for the wet clutch.

Small models (75/100): small oil capacity, so change often (every 1000–1500 km) and check the valve clearance regularly.

Valve clearance

The Laverda club forum and parts databases give the values below. They differ by source and by camshaft; if in doubt follow the workshop manual and choose slightly generous rather than too tight.

Model	Inlet (cold)	Exhaust (cold)	Source
750 SF / SF1 / SF2 / SFC	0.15 mm	0.20 mm	Louis motorcycle database
1000 / 1200 triple	0.20 mm	0.25 mm	Laverda workshop manual, quoted on the club forum
same, wider margin	0.20–0.25 mm	0.25–0.30 mm	Laverdaforum moderator
same, "Green Book"	0.20–0.30 mm	0.20–0.30 mm	exhaust up to 0.35 mm, noisy above that

Idle speed: 750 SF c. 800 rpm, SFC 1100 ± 100 rpm. Mixture screw on the 750: 1.5 ± ¼ turns open.

750 twin (SOHC)

Engine cold, plugs out, valve covers off.
Turn the engine until cylinder 1 is at TDC compression (both valves closed); because of the 360° crankshaft cylinder 2 is then at TDC on the exhaust stroke.
Measure and adjust cylinder 1, turn the crankshaft one full revolution and do cylinder 2.

500 and 1000/1200 (DOHC)

On a DOHC engine you measure the clearance between the back of the cam and the valve actuator, with the cam pointing exactly away from the bucket or tappet.
Measure each valve separately and note all values before you change anything.
On the triples the cams act directly on buckets; the clearance is set with shims that sit on the valve stem end under the bucket. For that the camshafts have to come out. Measure with a properly tensioned cam chain and first note all clearances, so you can order the right shims; the factory used shims up to 3 mm thick.
On the 1000 with 180° crankshaft the outer cylinders are at the top together; note which of the two is on compression.

Note the clearances found per valve in a notebook: a clearance that keeps getting smaller points to a valve seat wearing away, a known issue on the 1976–1978 1000.

Ignition

Early 750s have two sets of contact points with coils; from the SF3 and the 1975 SFC there is Bosch electronic ignition, as on all 1000/1200 triples. The 500 has CDI.

Triples (Bosch electronic): the pick-ups are on the left side of the crankshaft, 180° apart. Cylinders 1 and 3 share a coil with two leads, cylinder 2 has its own coil; so the system also fires a wasted spark in the exhaust stroke. An engine database gives a maximum of 32° advance before TDC for the Jota; check that with a strobe.

Model	System	What to check
75 / 100	contact points	points gap and timing per manual
750 up to c. 1974	Bosch, two sets of points	points gap per set, then timing per cylinder
750 SF3 / SFC 1975	Bosch electronic	wiring, pick-up, timing with strobe
500	CDI	wiring, pick-up, timing with strobe
1000 / 1200	Bosch electronic	same; up to 1980 the ignition unit is on the right of the engine

Contact points (early 750)

Set the points gap on both sets with the points fully open.
Put cylinder 1 on the ignition mark and adjust cylinder 1’s set with a test lamp.
Turn one revolution further and adjust the second set to the same mark.

Electronic: check earths and connectors first. With a strobe you can see whether timing and advance are right; rotate the pick-up plate if necessary. The timing itself is in the manual or on the rotor marks.

Carburettors and synchronising

From the SF1 the 750s have Dell'Orto PHF 36s with accelerator pump (left AS, right AD, with central float chamber); the 500 and 1000 have PHF 32s. Synchronising is necessary on all multis.

Synchronising

First set the valves and ignition and warm up the engine; put a fan in front of the engine.
Set the slides equal mechanically, so they start to move at the same moment.
Connect a vacuum gauge per carburettor to the manifolds.
At c. 3000 rpm adjust the cable adjusters until all gauges read the same.
At idle (c. 1000–1100 rpm) set the idle screws equal.
Set each carburettor’s mixture screw for the smoothest running and check the gauges again.

Accelerator pump (PHF): if the engine hesitates when you open the throttle quickly, check that the pump gives a squirt of petrol when the slide opens. A blocked pump jet or a dry diaphragm is a known cause.

Throttle springs: the 1000’s Dell'Ortos have strong return springs; a heavy throttle is normal, but check that the slides move freely and close fully.

Small models: one Dell'Orto; set idle with the air screw (1.5 turns open as a starting point) and the stop screw.

Clutch, brakes and fault finding

All models have a wet multi-plate clutch; the 1000 got hydraulic operation around 1980.

Clutch: cable 2–3 mm free play; with hydraulic operation change and bleed the fluid every two years.
Brakes: early 750s have Laverda drums of c. 230 mm (SF: double-sided with four leading shoes); from 1975 Brembo discs. The 500 has three 260 mm discs.
Chain: heavy bikes with lots of torque; check chain and sprockets often.
Electrics: Bosch on the 750 (first a belt-driven dynamo, later an alternator); 260 W Nippon Denso alternator from the Jota series 2.

Complaint	Possible cause	Check
Hesitation on quick throttle (PHF)	accelerator pump blocked	check the pump squirt
Uneven idle	carburettors not synchronised, air leak	measure vacuum, rubbers
One cylinder cold	plug, cap, carburettor, ignition	swap plug, clean carburettor
Valve clearance closing up (1000)	valve seat eroding	have the head inspected
Battery not charging (early 750)	dynamo belt slack or worn, regulator	belt, charging voltage
Rattling at the top of the engine	cam chain or valve clearance	tensioner, valves
Strong vibration (1000 180°)	characteristic of the 180° crankshaft	normal; check mountings
Clutch drags (hydraulic)	air in the system	bleed

Sources

Consulted on 18 October 2026; all text in this guide is our own work.

Additional club forum and databases:

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Workshop guide classic Laverda (750 SF, 1000 Jota, Alpino)