Carburetor

First briefly immerse the float in a container of hot water. The exact location of the leak will be noted by the source of small stream of bubbles. (Remove the float before the bubbles stop - otherwise water will get into it). Carefully mark the location of the leak. Now clean the area around the leak point down to bare metal for about 1/4" around - use very fine sandpaper or steel wool. Then warm the float up long enough to get every trace of gas out of the inside of the float. A heat lamp or flood lamp shined on the float overnite is good. (DON'T stick the float in a warm oven to dry!! It'll stink up the whole house and incur the wrath of any non-tractor enthusiast who lives with you.) Finally give the spot a quick final clean with brake cleaner, alcohol or similar (to get every trace of grease off), then butter the leak with a thin layer of JB Weld. Let the JB cure for 24 hours and you should be good to go.

BTW $68 CDN for a kit sounds steep to me too. You can get one for about $20 US by mail order from Carter & Grunenwald, OEM Tractor Parts and others.....