Moto Guzzi Le Mans 3
Figures apply to standard condition with the original air filter and exhaust. The year comes from the factory document and is not a production range: if your bike is a different year of the same version, these figures are your starting point.
Source and checks
- Moto Speziale table, page 1, data row 30; sales designation: “LM 3 ohne Punkt im Dell`orto”
- Cross-checked: Dell'Orto application catalogue, gedruckte Original-Ausgabe Dez. 1990, p. 42-43 (Betreiber-Fotos, archiviert: data/raw/dellorto_kataloge/katalog-1990-fotos/IMG_6403.jpg + _arbeit/-Crops)
- Throttle slide: Moto Speziale factory table “503”, second source “11570.603 = slide 60/3”. We show both and don't decide ourselves.
- Sources & method
Complete carburettor
PHF 36 DD1€264.95PHF 36 DS1€264.95Current Dell'Orto version. It may differ from your original (PHF 36 BS/BD); set the jetting to the figures above afterwards.
Matching parts from our stock exactly for this jetting
Main jet set around 132For tuning: put together your own sizesfrom €14.90Main jet 132Dellorto Hauptdüse 6mm, 132€3.25Ships immediately
Idle jet 60Dellorto Leerlaufdüse 5mm, 60€2.15Ships immediately
Needle K 5Dellorto Nadel Typ K 05€7.70Ships immediately
Needle jet 265 ABDellorto Zerstäuber AB 265€11.50Ships immediately
Float valve 300Dellorto Nadelventil PH... Serien 300€19.95Ships immediately
Pump jet 33Dellorto Pumpendüse 33€14.15Ships immediately
Starter jet 70Dellorto Starterdüse 70€5.10Ships immediatelyMore spare parts for Dell'Orto PHF
Part not listed?
Dell'Orto supplies almost everything. Just ask, we'll take care of it.
Moto Guzzi Le Mans 3
Figures apply to standard condition with the original air filter and exhaust. The year comes from the factory document and is not a production range: if your bike is a different year of the same version, these figures are your starting point.
Source and checks
- Moto Speziale table, page 1, data row 31; sales designation: “LM 3 roter Punkt im Dell`orto”
- Cross-checked: workshop manual 850 Le Mans III (F), ch. 15 Alimentation, p. 184 (850LM3_AtelierF.pdf, PDF-p. 12)
- Throttle slide: Moto Speziale factory table “503”, workshop manual “60/3”. We show both and don't decide ourselves.
- Sources & method
Complete carburettor
PHF 36 DD1€264.95PHF 36 DS1€264.95Current Dell'Orto version. It may differ from your original (PHF 36 BS/BD); set the jetting to the figures above afterwards.
Matching parts from our stock exactly for this jetting
Main jet set around 115For tuning: put together your own sizesfrom €14.90Main jet 115Dellorto Hauptdüse 6mm, 115€3.10Ships immediatelyIdle jet 50Dellorto Leerlaufdüse 5mm, 50€2.15Ships immediatelyNeedle K 18Dellorto Nadel Typ K 18€7.70Ships immediatelyNeedle jet 265 ABDellorto Zerstäuber AB 265€11.50Ships immediatelyFloat valve 300Dellorto Nadelventil PH... Serien 300€19.95Ships immediatelyPump jet 33Dellorto Pumpendüse 33€14.15Ships immediatelyStarter jet 70Dellorto Starterdüse 70€5.10Ships immediatelyMore spare parts for Dell'Orto PHF
Part not listed?
Dell'Orto supplies almost everything. Just ask, we'll take care of it.
Moto Guzzi Le Mans 3
Figures apply to standard condition with the original air filter and exhaust. The year comes from the factory document and is not a production range: if your bike is a different year of the same version, these figures are your starting point.
Source and checks
- Moto Speziale table, page 1, data row 32; sales designation: “LM 3 grüner Punkt im Dell`orto”
- Sources & method
Complete carburettor
PHF 36 DD1€264.95PHF 36 DS1€264.95Current Dell'Orto version. It may differ from your original (PHF 36 BS/BD); set the jetting to the figures above afterwards.
Matching parts from our stock exactly for this jetting
Main jet set around 115For tuning: put together your own sizesfrom €14.90Main jet 115Dellorto Hauptdüse 6mm, 115€3.10Ships immediatelyIdle jet 50Dellorto Leerlaufdüse 5mm, 50€2.15Ships immediatelyNeedle K 18Dellorto Nadel Typ K 18€7.70Ships immediatelyNeedle jet 268 ABDellorto Zerstäuber AB 268€8.95Ships in 1–2 weeks
Throttle slide 503Dellorto Gasschieber PHF 50/3€77.80Ships immediatelyFloat valve 300Dellorto Nadelventil PH... Serien 300€19.95Ships immediatelyPump jet 33Dellorto Pumpendüse 33€14.15Ships immediatelyStarter jet 70Dellorto Starterdüse 70€5.10Ships immediatelyMore spare parts for Dell'Orto PHF
Part not listed?
Dell'Orto supplies almost everything. Just ask, we'll take care of it.
Moto Guzzi Le Mans 3
Figures apply to standard condition with the original air filter and exhaust. The year comes from the factory document and is not a production range: if your bike is a different year of the same version, these figures are your starting point.
Source and checks
- Moto Speziale table, page 1, data row 33; sales designation: “LM 3 – USA”
- Sources & method
Complete carburettor
PHF 36 DD1€264.95PHF 36 DS1€264.95Current Dell'Orto version. It may differ from your original (PHF 36 DS/DD); set the jetting to the figures above afterwards.
Matching parts from our stock exactly for this jetting
Main jet set around 120For tuning: put together your own sizesfrom €14.90Main jet 120Dellorto Hauptdüse 6mm, 120€3.25Ships immediatelyIdle jet 50Dellorto Leerlaufdüse 5mm, 50€2.15Ships immediatelyNeedle K 27Dellorto Nadel Typ K 27€7.70Ships immediatelyNeedle jet 262 AB1Dellorto Zerstäuber AB1 262€13.69Ships in 3–4 weeksThrottle slide 503Dellorto Gasschieber PHF 50/3€77.80Ships immediatelyFloat valve 300Dellorto Nadelventil PH... Serien 300€19.95Ships immediatelyPump jet 33Dellorto Pumpendüse 33€14.15Ships immediatelyMore spare parts for Dell'Orto PHF
Part not listed?
Dell'Orto supplies almost everything. Just ask, we'll take care of it.
Moto Guzzi Le Mans 3
Figures apply to standard condition with the original air filter and exhaust. The year comes from the factory document and is not a production range: if your bike is a different year of the same version, these figures are your starting point.
Source and checks
- Moto Speziale table, page 1, data row 40; sales designation: “LM 3”
- Sources & method
Complete carburettor
PHM 40 AD1€279.90PHM 40 AS1€279.90PHM 40 ND1€259.95PHM 40 NS1 (04841)€258.95PHM 40 SD1€334.95Current Dell'Orto version. It may differ from your original (PHM 40 DS/DD); set the jetting to the figures above afterwards.
Matching parts from our stock exactly for this jetting
Main jet set around 170For tuning: put together your own sizesfrom €14.90Main jet 170Dellorto Hauptdüse 6mm, 170€3.25Ships immediatelyIdle jet 60Dellorto Leerlaufdüse 5mm, 60€2.15Ships immediatelyNeedle jet 265 ABDellorto Zerstäuber AB 265€11.50Ships immediatelyThrottle slide 601Dellorto Gasschieber PHM 60/1€84.80Ships immediatelyFloat valve 300Dellorto Nadelventil PH... Serien 300€19.95Ships immediatelyMore spare parts for Dell'Orto PHM
Part not listed?
Dell'Orto supplies almost everything. Just ask, we'll take care of it.
Not running right?Pick the symptom, we show the part responsible.
Pale, greyish-white plugs; flat and gutless at the top end; overheating
Runs better on choke; popping/banging on the overrun
Hesitation/flat spot when opening the throttle
Surging/leaning out at steady speed and mid throttle
Sooty black plugs; burbling running; smell of fuel; high consumption
Gets worse the hotter the engine runs
Always change in single steps (“one or two jet sizes, then check the plug colour”), judge only on a warmed-up engine and make just one change per test ride.
These notes do not replace a proper check. When in doubt use a lambda meter, a dyno or a specialist workshop – an engine running lean for long periods can be damaged.
Further reading
Frequently asked questions
What does the coloured dot on the Le Mans 3 carburettor mean?
The Le Mans 3 left the factory with three different jetting versions, identified by a coloured dot on the carburettor: no dot, red dot and green dot. The versions differ in needle, clip position, atomiser, main jet and pilot jet. So identify your own carburettor before buying jets — all three versions are in the table on the Le Mans 3 page.
Discussion: thisoldtractor.com
The spark plugs are black and sooty — what should I do?
Sooty black plugs show a mixture that is too rich. Which circuit is responsible depends on where the bike runs rich: at idle and steady speed it is more likely the pilot jet and mixture screw, in the mid range the needle position and atomiser, at full throttle the main jet. Also check for a sticking choke, the float level, a leaking float needle valve and an oil-soaked air filter. Change one step at a time and check the plug colour after every change.
Discussion: guzzisti.de
Air filter or exhaust modified — what jetting do I need now?
There is no blanket figure, and nobody can name one honestly without testing. More open intakes and exhaust systems lean out the mixture, so the setup has to go richer, usually starting with the main jet and often at the needle/atomiser too. Real-world reports show: the factory value is your anchor, and from there you test in steps (plug colour and how it rides, better still a lambda reading). Concrete community examples with full context are on the carburettor pages under “Real-world setups”.
Discussion: groups.google.com
In what order do I tune a Dell'Orto?
The proven order: full throttle first (main jet), then part throttle (needle position, atomiser if needed), and idle last (pilot jet and mixture screw) — and above all: only one change per step, tested on a warmed-up engine. The reason: the circuits overlap, and a wrong main jet falsifies any part-throttle judgement. The detailed procedure is in the guide “Tuning a Dell'Orto step by step” (German).
Discussion: caferacer-de
Do both carburettors need the same jetting?
Yes. Both cylinders need the same set of jets, and the factory figures always apply per carburettor. After every job the pair belongs synchronised (same slide lift, same mixture screw setting), otherwise one cylinder runs richer than the other and the plug colour becomes unreadable. Unequal jetting is almost always a sign of a previous owner tinkering.
Discussion: 2-ventiler.de