My AR was a hard starter from the time I bought it and I finally pulled the mag off, put it in a vise and turned it over. It was definitely not snapping - the wind-up cogs were not engaging, so it wouldn't start until it got to the point where it was turning fast enough to make spark without the impulse spring. Pulled the impulse cup off the bottom (keeping everything in the proper place) and found the spring in 7 pieces. I ordered a new spring, but since I wanted to run it that day, I took out the small pieces and brazed the 2 pieces with the holders on them together and put it back together. Put the mag back on and it started on the 2nd compression - maybe a little extra snap from a shorter spring ? Anyway, the new spring is still in a bag on the bench a year later - I'm sure I'll recognize the problem if it happens again and will put the new spring in then ! Meanwhile the AR is an easy start ! -Ron
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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