I've got a 1995 Toro self propelled mower that was giving be fits. I knew it was a carb issue, cleaned it, but it kept gunking up. I knew it really needed to be dip cleaned but didn't want to have the chemical cleaner around. Checked on eBay and got a new replacement for $25 bucks delivered. 5 minutes to swap it out. Primer bulb, pressed 3 times, first pull, started right up.
Life is good.