Been battling a vibration on the Stelvio between 3400 and 4000 RPM. Balanced the TB's several times. Even had the dealer balance them just to make sure. Checked the plugs and plug wires. Everything checked out but the vibrations/rumbles were still there. Spoke to some people and they said it was normal, spoke to others and they said they did not notice it on theirs and others just said it is what a Guzzi does.
Did some long rides over the last couple of weeks and was getting tired of it. Could thottle around them through gearing but not my idea of a solution. Was always in the same RPM range.
Since the vibrations where not tuning related, must be caused by something mechanical. My last bike was a KLR and I battled a similar vibration, ironically, around the same RPM band. On the KLR it was becuase of the new engine guards that I had put on. They were bolted in three spots, one on the engine, one on the pegs and one on the subframe. This configuration cause vibrations because it actually held in the vibrations of the engine and transmitted them throughout the entire bike. Solution here was to disconnect the connection to the pegs and vibrations were gone.
So I took a shot in the dark and removed the engine crash bars. The vibrations are now gone in the bars. Night and day when riding. Mirrors are steady during that RPM band and no more rummbling. The bars are attached to the engine block in two spots and the rear engine mount to the frame. Must be causing a resonance through the bike similar to the KLR.
I did notice that when I took them off the bolts were not that tight. This may have been the cause, but for now I am leaving them off. When I get time I will put them back on with some rubber spacers.
Just glad I am able to ride again with a smile on my face :woohoo:
Did some long rides over the last couple of weeks and was getting tired of it. Could thottle around them through gearing but not my idea of a solution. Was always in the same RPM range.
Since the vibrations where not tuning related, must be caused by something mechanical. My last bike was a KLR and I battled a similar vibration, ironically, around the same RPM band. On the KLR it was becuase of the new engine guards that I had put on. They were bolted in three spots, one on the engine, one on the pegs and one on the subframe. This configuration cause vibrations because it actually held in the vibrations of the engine and transmitted them throughout the entire bike. Solution here was to disconnect the connection to the pegs and vibrations were gone.
So I took a shot in the dark and removed the engine crash bars. The vibrations are now gone in the bars. Night and day when riding. Mirrors are steady during that RPM band and no more rummbling. The bars are attached to the engine block in two spots and the rear engine mount to the frame. Must be causing a resonance through the bike similar to the KLR.
I did notice that when I took them off the bolts were not that tight. This may have been the cause, but for now I am leaving them off. When I get time I will put them back on with some rubber spacers.
Just glad I am able to ride again with a smile on my face :woohoo: