Re: ’48 Champion 4K – running but need a little help on timing

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outbdnut2

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#79120

I’ve found on a couple of Champion 4LHDs, the carb throttle maxes out a little bit above "start" and as you advance the throttle handle farther, only the timing advances. If you go too far, it starts slowing down due to too much advance, and on most boats the sweet spot is about halfway between start and fast. I found the lighter the boat, the more advance you can give it this way as light boats allow more RPMs, and thus more spark advance. I have a couple of 4Ks, but haven’t gotten around to getting them running yet – maybe they are set up the same way. The main difference between 4K and 4LHD is the 4LHD has the hydrostatic lower unit, although early 4Ks do have a different looking cylinder block casting than later 4Ks and 4LHDs, even though bore and stroke are the same.
Dave