hello everyone I am new to this group and I need some help please. I recently bought a 1988 sportster 883 converted to a 1200cc. The owner let it sit for 3 months and has small oil leak from under the derby cover. Bike starts up fine and has decent idle. How ever once warmed up if I mash the throttle the bike bogs down while in Neutral. When in gear you have to continue to pull the throttle to raise the rpms and then you can start going to get moving . However there is extreme hesitation at low rpms and dies if you don’t gradually pull the throttle until high rpms. Also when off the throttle bike bucks like a horse while moving when off the throttle. Like I said when I mash the throttle weather I’m in fear of not it will heasitate and pop for 3-4 seconds and finally hit high rpms. Suggestions?

According to the owner it was about three months. Just hopping it’s not anything too serious.

Thank you very much I will try that and I will let you guys know what happens after that hopefully it fixed the problem!