carb question

[90dannyf]

Just finished my 440ex motor via 4mm stroke crank stage 2 cam. I know it needs the 450r carb, thats in the mail now. I have the stock carb on it now with 170 main and a 42 pilot 3rd notch needle. Starts great , idles good . You gun it and it takes off like its going to set the world on fire , then it falls flat on its face. I am asking you guys, is it because the carb is to small? Thanks.

[bkelley]

Do a plug chop then report back with the results. It's definitely not because the carb is too small. Plenty of people run stock carbs with 440s.

[dalejiw25]

Your motor is basically set up like mine and I'm runnin a 190 main (Slightly Lean). You might even wanna try a 195. A stock carb works fine for me. Check my sig.

[Wheelie]

I ran a 42 pilot, 178 main and needle on 4th notch from the top when I still had the stock carb on my stroker.