Almost certain I know what’s going on but would like some opinions. Just got a 01 warrior drove it for a day and everything was working properly. Changed some very dirty oil with Kawasaki brand atv/Utv 10W40, ever since I get a strong lurch into first gear. No it is relatively cold in my neck of the woods riding temps are between 30-40 degrees. I’ve noticed that if I’m ideling pull in clutch and shift down to first it clunks and lurches but if I still hold the clutch in and go back from 1st to neutral and back to first no clunk/lurch. Do you guys think oil is too thick causing clutch plates to stick? Should I find some 10W30?