grumpy,
Thanks for your post. FINALLY, I can get cleaner fluid to pass from the yellow-ringed opening through the main jet into the venturi. I will alternate between using the fluid and compressed air to ensure that the jet passage is as clean as possible prior to carby reassembly. As the main jet diameter is probably quite small, (maybe order 0.5 mm)attempting to blow air by mouth results in a fair amount of back pressure, which makes it a little difficult to judge if the jet passage is fully clear/open. Experience required? The same holds true for the use of suction to judge to if the check valve is operating correctly.
It should now merely be a case of the correct reassembly/adjustment of the carby and we're away?
I will bear in mind your caution regarding the setup of the inlet metering needle, lever and seat. (Incidentally, the carby kit I purchased for the WT 749A seems to have all the correct gaskets but the inlet metering needle is obviously for another carby as it is much larger than the one I took out. The original needle seems OK so I shall have to reuse it and hope for the best.
I will let you know how things progress.
Thanks again.
mustang
