If you have looked
at the rest of this site you will have seen plenty of pictures of my Mk3 850cc
Roadster. It started life as a prize in a "Spot The Ball" competition in "Motorcycle
News"
and was first registered on 22nd April 1977.
It had changed hands two or three times before I bought it
in December 1985 but was still registered with the first
owner and had not been ridden for many years.
When I bought it there were many parts missing but what was
left seemed to be in reasonably good condition apart from
heavy oxidisation of the aluminium parts and rust on the
chrome. Missing parts included most of the gearbox internals,
outer and inner gearbox cases, exhaust system, mudguard stays
and battery. Recorded mileage was 01912 and there was a letter
from a local dealer, Cromwell Motorcycles (who had been one of
the previous owners), stating that this was true to the best
of their knowledge. This letter also contained the story of
the "Spot the Ball" competition.
The rebuilding started within days, the aim being to
restore it for use rather than for looking at or "showing"
purposes. I was looking forward to the challenge of rebuilding the bike but
I wasn't sure what I was going to do with it once completed,
as I had not owned a bike for eight years.
It was at this point that I made my first mistake. I should
have started taking photographs straight away, then I would
have had a better record of the work carried out. Unfortunately
I was too eager to get started and the opportunity was lost
and I only have pictures of the completed work.
With so much corrosion I decided to strip the whole bike and
rebuild it from the ground up, cleaning, painting, plating
and replacing parts as needed. The frame was still in good
condition and only needed cleaning. Other painted parts that
required treatment were swinging arm, engine plates, centre/side
stands and fork yokes. All these parts were painted with Hammerite
(either Smooth Black or Hammered Silver).
The engine was stripped and rebuilt with some interesting
findings along the way. The cylinder head and barrel had not
been removed from new but when I took it apart I found that the
inner valve springs and a piston ring were missing (I wonder how
many other bikes left the factory in this state!)
Both the engine and gearbox were rebuilt to completely
standard specification with the only exception being the
extensive use of stainless steel nuts, bolts and fixings.
The original wheel rims were discarded and new chrome rims
were built onto the original hubs. The Dunlop TT100 tyres
that were fitted had perished walls and were replaced with
an Avon Roadrunner at the rear and an Avon F2 on the front.
All the corroded chrome was stripped and replated and a new
exhaust system purchased. This was the second mistake.
I should have bought the reverse cone silencers (as fitted
to the MK1 Roadster) and the exhaust system without the
balance pipe at the front. The former because they sound
and look better and the latter so that the system can be
aligned properly.
The project took about a year and a half to complete and
the bike has now covered about 3500 miles. The bike has been
stored for the last 2/3 years but will return to the road
soon when commitments allow.
16th April 2000