Last night, aided by my mate Jonny the 250 Trophy Sport was treated to a replacement chain and new needle, needle jet and main jet in the carburettor. The former has got rid of the tight spot and the latter has definitely made a great difference. Before the bike was always running rich and vibrated a lot. Fuel consumption was poor at well under 50 MPG. The needle was visibly worn and the main jet seemed to be the wrong size.
I had a good run out tonight up on to the tops of the Pennines and back and the bike runs a lot smoother, but now there is a degree of pinking at mid throttle openings. This I was expecting as this type of MZ engine has the spark plug in at an angle from the right hand side and pinking can be a problem. It is possible to ride round it, but it is an irritation. I may try and raise the needle a notch to see if that cures it, but I am now confident in using the bike and will see how it goes.
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