Do you own or know the whereabouts of a piece of UK Drag Racing History or just want info on a particular machine.

Moderators: timetravel, ukdrn

 #39895  by shasta
 Sat Mar 30, 2019 8:52 pm
The original bike first appeared with Amal carbs and as the bike was improved it finally ran with Hilbourn fuel injection running on Nitro. Experience and finances meant I would be using carburettors running on petrol ,but using Kawasaki carbs were out of the question due to their cost; anything related to Z1s or Z1000s commands high prices these days.
The obvious choice were the carbs fitted to the Suzuki GSF1200 Bandit model as these have been around for years so there is a good supply of them on the market. Having obtained two sets and offering them up to the Kawasaki cylinder head showed up a potential problem. The air inlet spacing of the Bandit cylinder head is different to that of the Kawasaki Z900 head and the Suzuki rubber inlet stubs have a different bolt spacing so can't be used either. Trying to fit the Suzuki carbs to the Kawasaki inlet rubbers didn't work either as the diameter of the Suzuki carbs is too big to fit.
The difference in spacing is about 5 mm and by luck it was found that the inlet rubbers used on the Kawasaki GPz600R have an offset of 5mm and are the same size as the Suzuki rubbers although are a push-on design and not bolted on, so all that was needed were some inlet stubs and I'd be in business.
The photos below show the stages in the production of the stubs ending with the carbs fitting the Kawasaki engines perfectly.
Difference in carburettor spacing
Inlet stub material
Tube turned to accept inlet rubbers
Stubs progressing
Completed stubs after cutting and filing
Finished inlet stubs
Carburettors fitted to engines