If you asked over in the Oliver board you'd get a much quicker answer. The dipstick is on the cap you pull to fill it. I'm not really familiar with the 1850, but it may be between your legs. It'll look like a breather vent with a bolt sticking through it.
To find the restrictor, based on our 1600 I think it'll be under the seat.
Here is a shot of my 1600. The restrictor screw for that side is at the top of the hydraulic housing above the rockshaft for the 3pt. arms. Your 1850 may be in a similar location. The hydraulic filler is closer to the front of that same housing, in front of where the seat would mount. I think the 1850 should atleast be similar. Not that it will be exact. To adjust the restrcition, you're gonna want to turn the screw in, after loosening the nut. Turn it in a little at a time (1/4 turn or so) until it lowers smoothly, then snug up the nut.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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