I did not have any luck running pwk35s on stock motors. What i mean is, under wot the 35s would run well and you could definitely feel them pull better then stock carbs on the big end but i never could get them to perform as smoothly as stock carbs for a "trail" application. I tried every jetting combo and needle combo but i never could get rid of the bottom end/midrange hiccups. I too was looking into different slides but aborted mission and just slapped the stock carbs back on which is what id recommend to you. Stock carbs actually work very well. I ran them on mtrs making mid 70s hp.