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Moto Guzzi frame numbers - is your bike what's its supposed to be ?
Gasoline - will a Moto Guzzi run on unleaded gasoline ?
Expected mileage of parts - a VERY rough guide to the expected lifetime of various parts.
Tuning - information on what will make it go faster.
Brake caliper overhaul - how-to guide.
Wiring - more warnings than help, I guess.
Wiring charts - see or download here.
Carburetor - Dell Orto Manual online
Carburetor - drawings, charts, and a how-to guide.
Gearing - Contains a nice utility for calculating gear ratios,
Special tools - see why you'll need them.
O-rings, seals, and gaskets - what you need to repair.
Technical : The complex stuff - exciting but heavy reading, take your time.
Please contact Gregory Bender with any questions, corrections, or suggestions for improvement.
Technical
O-rings, seals, and gaskets - what you need to repair.
Selection of necessary small parts (O-rings, sealing rings, gaskets +++) for major overhaul/shimming of Motor case / Rear fork / Gearbox on the big Guzzi-motors (750ccm–1000ccm)
Mainly identical parts from 1972 and until today. Check the 1100ccm-models.
CHECK YOUR PART CATALOUGE BEFORE ORDERING ANYTHING !!!
Chart kindly provided by Rolf Halvorsen, Norway.
| Q | PARTS IN THE MOTORCASE | MG art. no: | Specifications | Remarks | Tools | Euro/ea. |
|---|---|---|---|---|---|---|
| 1 | Sealing ring, front cover | 90402840 | 28x38x7 | Bosch generator ANGUS is a brand. (90402840001 = EUR 15,-) | 5,- / 15,- | |
| 1 | Sealing ring, rear main crank flange | 90405367002 | 53x68x10/8 VITON (Brown) | CORTECO 53X68X10/8 w/double sealing + oil-throwaway-ring | 11,- | |
| 12 | O-ring for cylinder bolts | 90706090 | Ø9,4x1,78 | 12 ea. (Alternatively, Parker O-ring exist in dim: 9,25 x 1,78) | 12x0,5-=6,- | |
| Gasket, front cover/motor case | 12001200 | 5,- | ||||
| Special-nut, crank shaft | 93601026 | SKF KM5 | Special | 7,- | ||
| Locking washer, behind this special-nut | 95028025 | SKF MB5 | Should be replaced every time, due to the actual ear breaks 2nd-time. | 1,- | ||
| Gasket, rear main crank flange | 12011800 | 2,- | ||||
| PARTS IN THE GEARBOX (5-speed) | ||||||
| 2 | Seals, around the pusher-rod | 14085900 | 2 ea. (Original no: 12085901 is now replaced) | 2x1,-=2,- | ||
| 1 | O-ring, “thin”, input-shaft | 90706235 | OR 2093 Ø23,52 x 1,78 | Between the clutch-boss and input-shaft bearing | 1,- | |
| 4 | O-ring, “fat”, input-shaft / output-shaft | 90706203 | OR 3081 Ø20,30 x 2,62 Parker Ø20,29 x 2,62 |
Between input-shaft and clutch-boss / Between 1'st and 5'th gear. Have also seen Ø20 x 2,5 Also used at Cylinder head | 4x1,-=4,- | |
| 1 | O-ring, “thin”, output-shaft (Later models) | 90706219 | Parker Ø21,95 x 1,78 | Between bearing in the cover and the washer under the Speedo-drive. | 1,- | |
| 1 | O-ring, in cover behind throw out bearing | 90706170 | OR 3068 Ø17,12 x 2,62 | Have also seen specified: Ø17 x 2,8 and Ø17 x 2,7 | 1,- | |
| 1 | O-ring, in cover for selector-pawls-shaft | 90706140 | OR 3056 Ø14 x 2,5 | Ø13,2 x 2,5 fits tighter due to rod is Ø14,0 | 1,- | |
| 1 | Sealing ring, in box | 90403547001 | 35x47x7 VITON (Brown) | VITON (Brown colour) | 14,- | |
| 1 | Sealing ring, in cover | 90403547 | 35x47x7 | (ANGUS is a brand) Identical with Sealing in Ø35 front fork | 4,- | |
| Throw out bearing | 12087001 | Bearing + 2 washers | 14,- | |||
| Special-nut, on input-shaft | 93601022 | Special | 20,- | |||
| Locking washer, behind this special-nut | 95028022 | Should be replaced every time, due to the actual ear breaks 2nd-time. | 2,- | |||
| Shims, for selector-drum | 55235000 | 0,6mm | 55235001 = 0,8mm / 55235002 = 1,0mm / 55235003 = 1,2mm | 1,- | ||
| Spring, for selector-pawls | 32238210 | 32238210 is latest version | Orig. No: 14238200 is replaced by 28238260 and further 28238261 | 5,- | ||
| Bearing, in cover (+ the same in the box) (It's the bearing in the cover, which is mostly stressed. Remember locking-plate) | 92218424 | 25x52x20,6 (2x14 in steel-housing) |
Double row angle contact bearing: INA 3205 / SKF 3205 AC3 / NTN 3205 AC3 / NSK 3205 JC3 recommended alt. by Peter Roper. (2x14 balls in metal house are better then 2x9 balls in plastic house.) | 74,- | ||
| Locking-plate, for bearing | 14213803 | Metal (For 3 screws) | 5-speed boxes after 1974. Don't use plastic plate. | 20,- | ||
| Gasket, box/cover | 14201110 | 1,- | ||||
| Nut, output-shaft | 14219310 | Moment: 17kgm | Pipe: Long 27mm, with sharp entrance and angle. | Special | 8,- | |
| PARTS IN THE REAR-FORK | ||||||
| 2 | Sealing ring, rear-fork | 90403040 | 30x40x7 | 2 ea. (ANGUS is a brand) | 2x3,-=6,- | |
| Bearing, rear-fork | 92249217 | SKF 30203 J2 | 17x40x13,25 Conical roller, 2 ea. (Orig. no: 92249216 is now replaced) | 2x27,-=54,- | ||
| UNI (Ø28mm, 1972 to 1975) | 12328001 | (Original no: 12328000 is now replaced) | 190,- | |||
| Bearing, UNI (Ø28) | 92204228 | SKF 62/28-2RS1 | 28x58x16 Recommended to replace whenever UNI is replaced. | 23,- | ||
| Rubber-gaiter, around UNI (Ø28) | 12548000 | 8,- | ||||
| UNI (Ø30mm, 1975 and newer) | 17328050 | 30328030 is replaced by 17328050 | 167,- | |||
| Bearing, UNI (Ø30) | 92204230 | SKF 6206-2RS1 | 30x62x16 Recommended to replace whenever UNI is replaced. | 22,- | ||
| Rubber-gaiter, around UNI (Ø30) | 18548000 | 8,- | ||||
| PARTS IN THE REAR -DRIVE / -WHEEL | ||||||
| 1 | Sealing ring, rear drive ”Small” | 90403850 | 38x50x7 | (90403850001 in VITON? can be found at EUR 21,-) | 4,- / 21,- | |
| 1 | Sealing ring, rear drive ”Big” | 90407085 | 70-85-8 | CORTECO is a brand (90407085001”VITON” = EUR 24,-) | 8,- / 24,- | |
| 1 | O-ring, Pinion housing | 90706584 | Axel diameter: Ø59,0 | (Parker O-ring: 58,42 x 2,62) Also seen: Ø57,76x 2,5 and Ø57,75x2,62 | 2,- | |
| Bearing, rear drive ”Small” | 92254340 | 40x55x17 C3 | (DURKOPP is a brand) | 59,- | ||
| Bearing, rear drive ”Big” | 92201070 | 70x110x13 | 73,- | |||
| Bearing, rear wheel “Cush-drive” | 92204220 | 6204 2RS | 2ea. 92201220 is an open bearing. Use 92204220, which is sealed (The same bearing 92204220 is also used at front wheel) | 2x15,-=30,- | ||
| 2 | Sealing ring, rear wheel “Cush-drive” | 90403247 | 32x47x7 | 2ea. | 4x2,-=8,- | |
| 1 | O-ring, rear wheel “Cush-drive” | 90706490 | Axel diameter: Ø51,0 | (Parker O-ring 50,47 x 2,62) can be an alternative | 2,- |
