Misfires at slight throttle

[Green95Hoe]

Recently built 460 Stroker with 12:1 Piston and Stage 3 Hotcam. 450R Carb with K180 Main and stock pilot.

Got maybe 5 hours on it so far. She idles fine and WOT is perfect as well. I have a K180 Main and it seems to be pretty happy with that. the 185 and 190 sputtered a bit. Anyway the problem is when I give it just a little throttle off idle. It misfires here and there and occasionally stalls out hard draggin the tires and launching me over the handlebars if im putting around the yard. All other throttle positions seem fine. Its only at maybe 10-30% throttle. Even in a wheelie when im blippin it she will cut out and fall on me. I replaced the plug and no difference. It gets a little better when its warm but its still a problem. Any ideas fellas?

~Brad

[Kaleigh]

are you running race fuel.. I think you're suppose to run only race fuel in a high compression piston.

[Green95Hoe]

Yes. I mix a 50/50 of 93 and 112. I did when I had a 426 as well

[Kaleigh]

here's something... I hope it helps.. even a little bit..

http://www.powroll.com/PDF/INSTRUCTIONS/JETTING/JETTING%20-%20HONDA%20TRX%20400EX%20SINGLE.pdf

[krt400ex]

that is a sign that ur running rich off the bottom...heck it is also a sign that ur running lean. but if u r running lean, the thing that will tell u is if the machine pops(backfires) on decel from WOT. if it is rich off the bottom it will bog a bit..like u r describiing. try turing the fuel screw in(leaner..i think) and see if that helps. but either way, ur pilot circuit is rich

[Green95Hoe]

Thanx guys, ill give that a shot tomorrow and let you know how I make out