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This is a mock up with the seat, tank,
front end and an RGV swing arm in place.
The swing arm goes very well - it has a recessed
shape in the side which is almost identical to one in the sides of
the frame's beam's.
The wheels are Dymags for a late TZ250.
Front: 3.5" x 17" and rear 5.25" x 17"
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This
is the bike with all the welding done. The wheels fitted and sub-frame made.
The
engine sits at a different angle to how it was in the original bike. This was
possible with the engine having an oil pump and it means the cranks fall at the
right percentage of the wheelbase and the sprocket can be placed close to the
swing arm pivot.
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be seen coming down from the beams. A third mount was made in the
crank cases doing away with the need for an engine cradle. The
RGV radiator was just offered up to show how much room between the
cylinders and the front wheel there is. I'm looking at running a
pair of radiators like the YZR does.
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As mentioned earlier, you can see how neatly the RGV
swing arm matches the TZR frame due to the matching recesses.
The picture also shows the peculiar nature of the
Yamaha 500 engine. The top cylinders are piston port reed valves whilst
the bottom cylinders are crank case reed valves.
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Besides the bracing behind the headstock the frame
spar that holds the back engine mounts, and the top shock mount, was
also braced at either end.
I guess this is also the point to thank my wife
for letting me keep the bike in the kitchen for such a long time. The
sub frame uses the existing top mounting - but a new lower one, which
was made to also serve as the seat fastner. |
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This shot shows the AP adjustable master cylinder
and the GP 4 pull throttle (minus one of it's adjusters).
I've used a foam holder for the brake fluid
reservoir - attention to detail on weight saving is something I intend
to pay attention to throughout the bike.
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This shows how nice and close the counter shaft is
to the swing arm pivot. The gear oil pump is also visible at the bottom
of the engine.
Both the bottom and top mounts were made in a
'C' shape to fit around the frame spar. They were then welded around the
3 surfaces.
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