Hi, first post here and hopefully some knowledge out there to help. I've just got a 2010 Beta Alp and its had the carb changed from the stock Suzuki CV carb to a mikuni pumper carb currently running a 132.5 main jet, when you go to a wide open throttle from low/mid revs it just bogs and stutters, now I'm no carb genius but I can strip clean and rebuild and the carb isn't old (less than 6 months) so I have given it a brief clean and going to try it again. My logic is its oferfuelling as if you are gentle and open the throttle slowly it will go to max revs but go wide open quick it bogs. I'm thinking dropping down a jet size to 130?? as I have these, they came with the bike so have jets from 127 to 137. Anyone any advice etc on this? Needle jet up or down??
Thanks in advance