I am running the tnt f1 also and I am only running 100 shot with an ms4 and long tubes and the walbro 255, do you think its safe for me to put in the 150 jets? Or should I get it tuned? I had it tuned for the cam and such already and the air fuel was at 14.7 dead on the whole way across the rev range till about 6000rpm then it was at like 12.9, then he added one degree of timing to everything and one more degree to the 6000+ rpm range, you think its safe to run the 150? Or should I spend the $100 on gas to ge to the dyno and another 100 for the tune?

 

So your a/f is 14.7 n/a? You need to retune for spray...look for 12.2 on bottle across the board on the 150

 

the same for the 100 shot?

 

Yeah, 12.8 on 100 and maybe a little richer on the 150 12.5 or so to play it safe. But I would def get a retune if you're 14.7 n/a

edit: 12.8 n/a low 12 maybe 12.2 or so on the jug

 

I appreciate the help 99silverado

 

My bad man...Shoot for 12.8 all motor and low 12 on juice, it is getting late lol.