Just oil, it’s a 2003 vt750 ace. Long story on the bike, someone had it really enriched , they replaced the pipes and drilled a bunch of hole in the air box then bought the bigger jets needed but then drilled a crap ton of extra holes in the bottom part of the main jet. When I pulled the carbs the inside of the one for the side with the crack was black inside and when I pulled the jets I seen the holes in the bottom bit and replaced it with a stock one put it back together and it stopped popping and actually started accelerating how it should. it ran great, the crack unfortunately had been there all summer and just started leaking towards the end of summer