Japauto 1000 VX

1974 Japauto 1000 VX

Japauto is a Honda motorcycle in Paris that turned some CB 750 in real super bike

They are rare especially complete down to the key holder and with matching french registration papers.

So what all is done to it?
How'd they get a cb750 out to 1000 cc?

Saw this over on SOHC4.net, quite a nice little piece of history there.

SONIC. said:

So what all is done to it?
How'd they get a cb750 out to 1000 cc?

Click to expand...

On their first 950cc engine Japauto used an OEM block with rebored cylinder block.

That was enough to win the Bol d'Or in 1972 and 1974 but was a little too "crude" for road use.

So in 1974 they started working on a carefully rebored engine block and a new cylinder block casting made by JPX with special pistons by Bretille (see second photo)

The engine became both powerful ( 85 / 100hp depending on the exhaust and carbs) & reliable.

On this photo you can see the original Honda CB cylinder block ( center) the first 950 SS cylinder block ( left) and the 1000 VX cylinder block (right) as well as the three corresponding pistons.





The engine look is very different with the JPX block

Very cool bikes.