Posted by FarmallCT on January 12, 2017 at 18:21:47 from (69.113.240.233):
Hi everyone,
Some of you probably know that I have been working on a old F-20 that I got this past fall which had some spun rod bearings. I am glad to say that thanks to the help and advice from many of the members on here, this F-20 lives again!
After cleaning up the crank, finding a set of new bearings, and reassembling the engine, it pretty much started right up this past weekend! Just changed the oil today for the first time since doing the work and it didn't show any bad signs. Now it has some fresh 15w-40 in it and runs pretty good. The only downside is that after I changed the oil and brought it out today it decided to spring a rather large leak at the bottom of the radiator. Thankfully I have a spare which (I hope) is good and usable.
Attached is a picture and a link to a video of it I posted on Youtube.
The only questions I have are related to it running a little rough. Mainly the fact that when its idling it seems to run best in the "Start" or the middle position on the magneto. If I put the magneto in the "Run" position or all the way down, it seems to sputter a lot more. The only difference is when it is on the road in the road gear, if I throttle it up and switch the Magneto to the "Run" position it seems to throttle up much more and get a lot more power, but it does still sputter and backfire a little through the carburetor and sometimes seems to cut out a bit but other than that it runs like a champ. Not sure if this would be a carburetor problem or magneto problem since I didn't touch the mag and for the most part it runs great in the run position at higher speeds. Someone did mention that F-20s were known for idling rough but much better at higher speeds so not sure if thats it or it needs some tuning. If anyone can please advise that would be appreciated.
Also, I might as well ask while I'm posting about it, which jet is the idle and which is the main jet on this carb? One is right above the other and the top one is smaller than the bottom I think. Might try adjusting it once I know which jet is which.
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