Well, for several years I had the idea to buy a timer. I collect old tractors and also work on them for others in my free time. One of my customers has a JD 3020 gas which has given him some problems. Started, idled and ran fine, but as soon as it started to run hard it started hissing, spattering and losing power showing signs of sync being off. That's when I decided to invest in rear synchro lights. I placed an order within 15 minutes and next week I took this unit home to check the timing on my tractor. The specification for this is 20 degrees at 2100 rpm. Well, it had 25 degrees of lead at idle. problem found. Reverted the timing to spec and it's been working great ever since. I also used this light to test drive some of our other gas and propane tractors to make sure they were at least close.
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