I've been mucking around with an A+ auto setup for my Moke for some time now (along with house building it took a back seat!).
I prefer a weber over the stock SU so I made a kick down rod, used the heavy style weber linkage which is a good setup for the lever and presto. The weber I had was off a mild 1275 so I figured it would run, but need rejetting, so I just tidied it up and started her, no worries.
But then it had such a flat spot from take off to around 3000 rpm! really crappy! Found a slight manifold leak so fixed that, checked the valve gaps and timing all good....
I gave up and took it to Kent town Dyno, highly recommend John there, very nice helpful guy.
He checked everything over, changed the main jets (which had been drilled out and were not even the same!) but he said it was only a minor change, then some wizardry with the accelerator pump jet, but still the huge flat spot!
He decided it was a lack of timing advance. So he stripped and bench tested the dizzy, stock electronic Jap pollution spec version, and the main spring is way too heavy, apparently it didn't move below 1600 rpm and didn't allow enough swing until 6000 on the bench test!
He swapped it for one from a toyota dizzy and all fixed!
So why the heck do they have such a heavy spring?
Any way it is out the shed and on the road for the last day of summer
, just went for a spin to the beach and it was all worth it!
