19-01-2018, 04:50 PM
(19-01-2018, 01:59 PM)Nick Salmon Wrote: It is a feature of several of my 7s that, from cold and with the choke knob fully out, they will start very smartly, run cleanly for perhaps 5 seconds, and then die away and stop. Operating the throttle makes it die immediately. Wait a couple of seconds, start up again, same thing. This will happen three or four times and then, at last, they will continue to run happily and everything is normal. Other 7s with the same setup will start and run immediately.
I always manually pump fuel up to fill the float bowl prior to starting - which is what it initially runs on of course. All use 26VA Zenith carb.
Any clues as to why this happens? Is it a fuel pump issue?
I Had the identical problem a couple of weeks ago. As suggested the small equalising brass jet by throttle butterfly needs to be taken out and checked but my problem was behind that jet is a very small hole leading into the centre of the carb. Also, remove the slow running and you will see another small hole at the top of the screw threads. Check that as well