I recently came into possession of a very cosmetically intact scrambler that, upon closer inspection had seen better days in terms of internal maintenance. This bike is giving me the most perplexing issue I have ever had. It is fine at low revs and holds a healthy idle of about 1200 and will feel fairly high in torque at near-idle speeds, but once you rev over about 3,500 - 4500 while under load, it becomes completely anemic and struggles to accelerate. When I attempted to tune and synch the carbs shortly after I got it home, I noticed that the right cylinder (with the left plug out of the hole and grounded to the fins) revs all the way to redline absolutely fine and with no hesitation, but the left cylinder under the same conditions will stop right above 3k and then sound like I just turned the bike off. I have already swapped out a dead condenser that was resulting in only one piston firing, and I dropped 100 bucks on a brand new AGM battery. I also have replaced the FUBAR'ed float bowl gaskets, cleaned every brass part in the carbs, made sure the diaphragms are intact, and that there were no more air leaks. While initially cleaning the carbs, I discovered that one side (the one that won't rev past 3k) had a 105 main jet while the right side had a 110. I just finished reinstalling everything, thinking that a new 110 jet from CMC on the bad side would fix the issue, but it still persists. I have a nice blue spark on both plugs, both pipes are hot, the OEM airboxes are still there (though I haven't yet checked the Filter elements themselves), and I know for a fact that I am getting fuel to both carbs. The only thing I can think of at this point is either bad compression that is entirely localized to the left cylinder, or maybe a float height issue? The overflow on the left carb occasionally drips gas, and the plug from that side is black, so maybe there is too much gas in the float bowl causing a rich condition? Any suggestions are more than welcome, as this is only my second vintage bike, and my fist Honda twin, so I still have a steep learning curve ahead of me.