Thanks for the help. I understand how it all works, there's not much to change on a fixed jet carb - which both the original zenith and the Weber are. The only adjustments, other than changing the jets, is the float level. My only issues are: does it have the correct jets fitted, and am I measuring the weber float level correctly, as the instructions are a bit vague:
It is essential that the following directions be complied with in order to obtain correct leveling of the float.
Make sure (only for brass float) that the same does not show any pit. Check that the float can freely slide on its axis.
Make sure that the needle valve is tightly screwed in its housing and that the pin ball of the dampening device, incorporated in the needle, is not jammed.
Keep the carburetor cover in the vertical position, since the weight of the float could lower the pin ball fitted on the needle.
Make sure that the float clip is perpendicular to the needle and does not have any indentation on the contact surface which might affect the free movement of the needle itself.
With carburetor cover in the vertical position, and float clip in light contact with the pin ball on the needle, the distance of the float from the upper surface of carburetor cover (with gasket fitted) must measure 6.5mm for brass float, and 36mm for plastic float.
After leveling has been done check that the stroke of the brass float is 6.5mm, and the plastic float is 8.5mm. If necessary adjust the position of the lug.
Check that the return hook of the needle allows it free movement on its seat.
NOTE: The operations of the leveling float must be carried out whenever it is necessary to replace float or fuel inlet needle valve. In this last case it is advisable to also replace the sealing gasket, making sure that the new needle valve is tightly screwed in its housing.
Keep the carb cover in the vertical position???? I did the measurements with the carb cover upside down, like I have done on other similar carbs, but I am now doubting whether this is correct.
quote:
I know what I would do but I am biased you dont have to modify
the body unless your going radical like mr panky!
So, if I were to fit an SU, what manifold do I need to use?
Thanks
Andy
so bought a new old stock one from an auto jumble. Fitted it she now starts first time every time, going to down to the Welsh meeting we got 31MPG not bad, but Mr P’s got a little more with his SU conversion, can you guess what carb I fitted[?]
