Richard sent me an e-mail:

"Hello there
My name is Rich, recently I came across this bike
which has been standing for 15 yrs or more,the owner had
started to rewire it and given up. I bought the bike
and when i got home started to have a good look around
it. I have been trying to find out what the frame is
but have had no luck so far. The engine is a 76 900
bored out to 1025cc, ported head, 29 mm smoothbores,crank
work, baffled sump, oil cooler. The previous owner had
taken the Moriwaki cams out and replaced with standard
cams, he also had the bike monoshocked by JMC in 1982.
I hope to put it back to twinshock at some point, hope you can help
Regards rich.uk"

Richard has figured out what the frame is. It is a Moriwaki Monster replica (thank you, Michio).

The second picture is the same bike as at the top some time later.

The third picture is a Harris F2 with a Yoshimura XR69 engine, according to Richard. It is not his bike but it is nice anyway.