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Inlet Manifold Insulator Bush

Started by David S, September 17, 2018, 05:32:22 PM

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David S

Folks, The six off M8 insulator bushes used between the inlet manifolds and the fixing screws are made from Tufnol. The original Hesketh Motorcycles drawing no 1/0500 (Sheet 1) calls for a torque setting for these screws as 10lbft (14nm). Using this setting causes new bushes to crack. What happens is that the exposed outer edge of the bush breaks away.
Has anyone met this problem and found a solution? Perhaps a new material?


Hi David;

I've never seen these bushes on my V1000.  Mine has an insulating plate between the manifold and cyl head.  This is triangular, has two 'inlet' holes and three 'mounting' holes. 

Does your bike have these plates plus the bushes?  Or are the bushes instead of the plate?

1974 Triumph T160 Trident (New Project)
1981 Yamaha XS1100 Sport (Trike Project)
1981 Yamaha XS1100 Sport (Red Sport)
1982 Hesketh V1000 (Production/Development Engine)

Rob B

They all have them Jeff.

Insulator Bush x 6 - Hesketh P/N 2/0513 used with P/N 0/0500 - Price £0.480ea on 12th March 1982

The insulating plates you mention (Gasket-Carburettor) are the P/N 0/0550 x 2 - Price £1.100

They split because they are 36 years old.

Cloth base Bakelite stand-off collar/flange washers are still the best you can get for thermal conductivity versus maximum temperature, although PEEK and Epoxy Glass are also good if you want a modern alternative.
Hesketh V1000 Black/Gold/Gold EN10++
Hesketh V1000 Red/Black/Black EN10++
Hesketh V1000 Black/Red/Black EN0
Laverda 180 Jota  Orange!
Triumph 900 Sprint