The Bike Museum

Classic Italian Motorcycles

MV Agusta » 850SS Monza Boxer

Make MV Agusta
Model 850SS Monza Boxer
Capacity 837
Start Year 1977
End Year 1978
Bore Stroke 69.0 x 56.0
Engine Config Inline
Number Of Cylinders 4
Engine Type Four Stroke
Valves per Cylinder 2
Valve Operation Double Overhead Camshaft
Power 61
Cooling Air Cooled
Gears 5
Transmission Shaft Drive
Weight 260
Front Wheel 3.50-18
Rear Wheel 4.00-18
Front Brake Twin Disc
Rear Brake Drum
Top Speed 235
Fuel Cap 24
Number Make 27
Engine Number Range As for America Series
Frame Number Range As for America Series
RPM 9000
Carburettors 4 x 27mm DellOrto VHB
Summary

This was the last model produced by the factory and sold by them as the 850ss. In fact these were unsold Americas which were tuned and and fitted with optional extras in order to move them. Many dealers and others have created 850s out of Americas and many of the so-called 850s featured in books and magazine articles are in fact dealer or owner-modified Americas. The factory produced only 27 examples which were sold as 850ss s. They were also briefly called Boxers in the UK. In Germany they called them Super Daytona. The original 850ss was an America with the following options - EPM Mag wheels, 837cc engine, 27mm carbs without air cleaners or linking rods, inlet camshaft on the exhaust, triple Brembo discs, dual point Marelli distributor. 850SSs made for the US market retained the 26mm America carbs with air cleaners and had higher clip-ons and 850ss decals. Some of the last bikes converted by UK importers had a mix of whatever parts were available. All of the early factory produced bikes seem to have frame numbers below 2210100 suggesting that they were built from an unsold batch of bikes right at the back of the warehouse. First in, last out.

MV Agusta Monza  UK version of the factory 850ss
UK version of the factory 850ss
MV Agusta Monza  Chrome exhausts
Chrome exhausts
MV Agusta 850SS  Unused and totally original 850ss
Unused and totally original 850ss
MV Agusta Boxer  Boxer
Boxer
MV Agusta 850SS
MV Agusta 850SS  This bike is totally original and unused.  Even the original 750decals have been left.
This bike is totally original and unused. Even the original 750decals have been left.
MV Agusta 850SS  27mm carbs without air cleaners
27mm carbs without air cleaners
MV Agusta 850SS  Brembo front brakes
Brembo front brakes
MV Agusta 850SS  Brembo rear brake master cylinder with EPM cast alloy bracket.
Brembo rear brake master cylinder with EPM cast alloy bracket.
MV Agusta 850SS  Brembo rear brake with EPM cast alloy bracket.
Brembo rear brake with EPM cast alloy bracket.