stroker jetting

[liftedandgifted]

I have a 1989 banshee and when a had a stock stroke crankshaft with trinity stage four pipes, cool head with 171 lbs of compression, v force reeds, reeds spacers, 4 degree advance key, porting but port timing is not raised, toomey two into one air filter,quad always ran extremely well. I just put a vitos 4mm stroker crank with spacer in and went to 280 mains and left the 25 pilot in. It was way too rich and after a couple times of jetting I ended up back with 260 so it wouldn't foul out plugs. My problem is that if I am barely moving then punch the throttle it hesitate then picks up or I will have to feather the clutch, I played with the air screws and it helped the best at 1.5 turns out. also when I get on it hard it runs good at the begining of the gears but even before I am ready to shift it quits accelerating before it is fully revved out. I am pretty sure my problem is in my carbs but I need to know where to go with it. Also my needles are in the middle position also I switched domes so the compression is the same. Let me know if you have any ideas or solutions.

[H300F]

i think your problem is because the port timing is off because of the crank, you cant expect it to run good without changing anything. i have heard without porting and placing the spacer plate on top or bottom either gives you all bottom or all top with that crank. and you should be up in the 350 plus main jets if everything is done right.