I have a 4mill long rod, 66.5mm ported(not sure how much), 22cc, +4timing,fmf fattys,
Before I did the crank,timing,head all was good but after I did those mods when im going thru the gears WOT 1-5 is good screams. But when I hit 6th it will scream for a second then it comes down a little and then back up to screaming. It's like half way thru 6th I let off the throttle a little bit but i didn't. I would say it feels like the lower rpm/bog comes in on the powerband. Is it possibly my stock carbs can't allow enough air? Any ideas? TIA