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B&M Model MC Friction Drive Siren
Siren joining plate for securing the cable
Siren lever assembly
Siren return spring
Siren rubber pad

While Moto Guzzi made frames with siren mounts for use by police departments, Moto Guzzi did not make sirens. Instead, individual police departments mounted a variety of sirens as per their department preferences. Some departments used electric sirens while others used mechanical sirens.

B&M Model MC Friction Drive Siren

Updated: Aug 28, 2009

Thanks to Paul Linn for sending me these photos. Paul received these files from Brian at B&M Siren. B&M Siren sells parts and restores old sirens.

B&M Model MC Friction Drive Siren, exploded view. Photo courtesy of B&M Siren. These sirens were mounted by some police departments on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.B&M Model MC Friction Drive Siren, exploded view. Photo courtesy of B&M Siren. These sirens were mounted by some police departments on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.

B&M Model MC Friction Drive Siren, detail. Photo courtesy of B&M Siren. These sirens were mounted by some police departments on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.B&M Model MC Friction Drive Siren, detail. Photo courtesy of B&M Siren. These sirens were mounted by some police departments on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.

B&M Model MC Friction Drive Siren, as mounted by some police departments on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles. Photo courtesy of B&M Siren.B&M Model MC Friction Drive Siren, as mounted by some police departments on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles. Photo courtesy of B&M Siren.

Moto Guzzi 750 Ambassador, with B&M Model MC Friction Drive Siren. Very high resolution photo, download to your computer to fully appreciate the detail. Photo courtesy of B&M Siren.Moto Guzzi 750 Ambassador, with B&M Model MC Friction Drive Siren. Very high resolution photo, download to your computer to fully appreciate the detail. Photo courtesy of B&M Siren.

Siren joining plate for securing the cable

Updated: Apr 15, 2010

Before selling a siren joining plate for securing the cable (MG# 13744540) for my Dad, I took some measurements and photos of it.

Siren cable bracket for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.Siren cable bracket for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.

I traced the outline of the steel bracket onto a piece of paper. Please reference the file below along with the photos as you digest these details.
Overall length is 33 mm (this is the length of the main body, from outside the bends)
Overall width is 15 mm (this is the width of the metal used to make the bracket)
Length of the arm with the hole in it is 18 mm (from outside the bend)
The diameter of the hole in the arm is 4.4 mm
Length of the arm with the slot in it is 16.2 mm (from outside the bend)
The width of the slot is 1.9 mm. It looks to me like they drilled a hole, then cut a slot down to meet that hole.

Download Name and Link	File Size	Number of Pages in File
Outline of siren bracket Gregory Bender drew this outline.	372 KB	1 page

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Siren lever assembly

Updated: Apr 15, 2010

Before selling a siren lever assembly (MG# 13606840) for my Dad, I took some measurements and photos of it. The siren lever assembly is comprised of the following parts:

Siren lever for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.Siren lever for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.

Lever, siren (MG# 43605640)
Chrome plated steel. Marked with "CiTe", a brand name, I believe.
Fulcrum, siren lever (MG# 40603700)
Cast of bronze or brass. Sized to fit 22 mm handlebars. Marked with "CiTe", a brand name, I believe.
Screw, lever to fulcrum (MG# 45604900)
A steel shoulder screw with the following dimensions: 6 mm x 1 mm x 20 mm (includes a 10 mm shoulder)
Washer, lever screw (MG# 45605000)
A steel spring locking washer with the following dimensions: 6 mm
Nut, lever screw (MG# 45605100)
A steel nut with the following dimensions: 6 mm x 1 mm
Screw, fulcrum to handlebar (MG# 45606300)
A fully threaded, slotted, cheese head machine screw with the following dimensions: 5 mm x 0.8 mm x 25 mm
Bushing, fulcrum to handlebar screw (MG# 45605300)
A steel tube with the following dimensions: 5 mm inside diameter, 9 mm outside diameter, 10 mm length
My photos don't show it very well, but the screw pulls this tube into the handlebar, thus locking the lever in place and preventing it from rotating. You'll note in some photos that you can see a hole on the inside of the lever…this tube extends into that area.
Roller, siren cable (MG# 45605800)
This piece was missing.

Siren return spring

Updated: Apr 15, 2010

Before selling a siren return spring (MG# 13744440) for my Dad, I took some measurements and photos of it.

Siren return spring for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.Siren return spring for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.

The overall length is 71 mm
The length of the coiled spring portion is 47 mm
The length of each cuved end is 12 mm
The diameter of the wire is 1.64 mm
The outside diameter of the coiled section is 12 mm
The inside diameter of the coiled section is 8.72 mm

Siren rubber pad

Updated: Apr 15, 2010

Before selling a siren rubber pad (MG# 43263325) for my Dad, I took some measurements and photos of it.

Siren rubber bumper for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.Siren rubber bumper for friction drive sirens as used on police models of the Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, and 850 California motorcycles.

The overall length is 18.2 mm
The diameter of the top bumping portion is 15 mm
The height of the top bumping portion is 10 mm
The diameter of the groove is 6.6 mm
The height of the groove is 3 mm
The diameter of the retaining portion is 7.8 mm
The height of the retaining portion is 5.2 mm

Moto Guzzi V700, V7 Special, Ambassador, 850 GT, Eldorado, 850 California - Sirens

Table of contents

B&M Model MC Friction Drive Siren

Siren joining plate for securing the cable

Siren lever assembly

Siren return spring

Siren rubber pad