from my experiences with modifying my 1bbl carb...i bored it out...but i played with different jet sizes and accelerator pump adjustments and stuff like that...and my very first attempt was actually the best...i had a massive jet and the accelerater pump was set to shoot way earlier than normal...the result was good power...just a nasty rich smell...I have tried smaller jets...i can get it running without the rich smell but the performance isnt there...I have a few more things to try out now...but i have a larger jet thrown in again..so i think that it should be fine having all that extra fuel...just not so much for gas mileage