Flatslide for a 84 WR250

Doing some tuning on my "new" 84 WR250. Runs very rich, blubbery. Slide is worn badly and has been sanded (modified). First question is would I benefit from installing a new flatside carb? Performance/user friendlyness? Looked up the factory jetting and this is way leaner and still rich. I'm thinking it has worn needle/jet. Second question is what would be a acceptable compression PSI on this engine? I got 125psi with carb removed, engine warm. My 82 CR250 had 150psi cold, I checked it for a reference. Thanks in advance, Scott

yes, it's worn & probably a lot more. i too am looking into 38mm pwk keihin and spoke to the owner of carb parts warehouse in oh. he sets it up for the bike & type of riding and ships out w/some spare jets. $250+/-. rick horvat recommends him,, not just a parts seller