Thanks for sticking with me on this fellas. Ive spent the last several evenings tinkering with this tractor to fix/adjust as many of the lil issues as I can to improve its operation. Luckily for me there arent too many, but a few did leave me scratching my head and looking for a monkey with a wrench.
At this point in time I believe I have the timing adjusted pretty close to what it should be. I tried Matt's static timing method several times, but unfortunately this resulted in rather late ignition as evidenced by frequent backfires and poor running overall. On the positive side, it was easy to perform. I then tried a timing light, but found it rather difficult to adjust timing with any consistency, so I settled for "decently close" being ~.017 as I originally thought.
While experimenting with timing, I noticed that the throttle and choke linkages didnt quite look right. Sure enough, according to the book the governor linkage was set for the LEAST sensitivity, and this engine never seemed to have much power due to a lack of governing. A few trials later, I came to the conclusion that the 4 least sensitive positions (closest to end of governor arm) resulted in no/almost no governing. Coincidentally, at all four of these positions the engine will reach full RPMs without issue, but under load it lugs down until it stalls or load is removed. With the spring hooked into the fifth position, the tractor will happily chug up and down hills while mowing without issue and appears well governed, but unfortunately will not reach full RPM with the mower deck engaged. Despite the throttle being wide open, the governor keeps the engine at relatively low speed (~1400) under load, which means the mower barely spins fast enough to cut and not enough to cut at any normal tractor speed. Without the mower engaged and simply driving, or if I push on the governor arm/carb throttle arm it gets up to ~1800. Ive tried adjusting the link between the governor and carb, but had no success. Its possible via this link to lower the top speed by lmiting max carb open, but doesnt appear to increase it. Ive considered putting more tension in the throttle spring adjustment, but hesitate to do so as I think it will just hurt the governing.
Any ideas?
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