Alright Sporty Nuts,
I have an 01' 883C that has been punched to 1200. It has a big sucker and V&H straightshots. The other day coming home from work I stopped for gas and that fuel came out of the pump real slow. I suppose my problem could be bad gas, but I don't think so cause my problem only happens at higher rpm's. OK, so now to the problem! When I get the bike up to the higher rpm's (guessing 3500 or so) a vibration-like noise starts and it sounds like it is coming from the front cylinder area. If I let off the gas, it goes away but comes back when the rpm's go up again. I posted in the General Chat area and they said to make sure everything is tight. Well, all bolts and heat sheilds and exhaust flanges and everything else is tight, so I am at a loss. I don't know, but I am guessing if it was and internal engine problem I would have noise at all rpm levels and there would be a lot of missing and the bike would run poorly. So, any and all suggestions are welcomed, it is just driving me nuts.
Thanks,
Joe

 

Just a guess and you've probably checked, but how are the mounting points on the frame for the engine? Is it possible one is loose,cracked, or possibly broken that causes the vibration-like noise at the 3,500 rpm range?

 

It could be a lifter going flat and banging the rocker.