Power is affected by the setting of the main jet, but it is not easy to adjust for noticeably more power without having it on a dynamometer. You want to first be sure that your timing, spark and valve adjustments are exactly right, and then put it on a dyno if you can gain access to one. If you can't get it on a dyno your best bet is to get set up to mow or whatever job you have where you can notice an increase or decrease in power as you have already, then stop and adjust a little.It will be unlikely that you will notice a change unless it was way out. When under a heavy load if you are seeing black smoke it is an indication of running rich. Another possible test is to pull a loaded wagon of some sort up a good grade.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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