2016 KTM250SX

So I recently purchased a 2016 KTM250SX...called and verified with shop that when purchased the engine had been completely rebuilt...bottom and top...bike had roughly 4 hours according to guy I bought it from on the new engine..says broke in properly etc...just to be safe I rode it around the house for a tank or so at quarter throttle to half throttle then up from there...To date I've put about 6 track hours on it..

I'd say I'm a local B rider...raced lorettas in C....long story short this past weekend I was at a sand/clay track practicing and last moto was just a play moto...going up face of jump bike completely bogged down to almost point of dying from wide open 3rd gear...I pulled clutch in..coasted up face of jump and going over table tried to give it more gas and it just bogged straight down again...shifted down and just cruised back to truck...shut it off and let sit for maybe a minute to look over...cranked it back up..started fine, revved up fine and I rode it just around the parking lot in second and it seemed like it was running good. Not wanting to risk anything I just loaded up. Got back to garage, compression seems good..(I can push the kick starter down with my hand but its not easy to do). Havent pulled plug yet but air filter was pretty stuffed up just from the sand/dust of track.

Theres a race this weekend and I'm just curious what everyone's thoughts are? I'd hate to get out in the race and the bike lock up mid moto...The guy before had always ran the vp premix..T2 which is mixed at 40:1...that day I switched to pump 93 and mixed at 40:1. I didnt see a need to run the T2 with a stock displacement engine. The way the bike acted my thoughts were it was about to seize up but wouldnt think that it would continue running the way it did.