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i have a v85, but will get that kind of noise from a bash guard under the right exhaust pipe if i accelerate a certain way. it's tight but just the resonance causing the noise.
I chased an identical vibration exactly and only at 32-3500 RPM’’s on my V85. Started happening AFTER I installed the Y-pipe, so I knew it had to be associated. One day I was determined to find the cause. I took off the bash plate, still there. Took off the header shields, and it was gone! Saw a small mark on the inside of the left shield (I Cerakoted the bash plate and shields black). Turns out the head of the exhaust clamp nut was making contact with the shield and only got audible at certain RPM’s. Many said “they all do that”, but I didn’t buy it. It was driving me nuts!My guess is yours is associated with the tank being off. I would start there.
I spent 2 hours today going through the bike trying to track down this sound. I didn't consider that it could have been when we took the tank off. I have a friend coming over this week to remap our ECU's with Beetle maps so I'll see if he has time to help me take off the tank, and perhaps see if that could be causing it.Thanks for the suggestion. Hopefully it is the tank as I suspect it's more of an annoying sound vs the engine about to grenade which is my main concern .
When the tank is off, make sure the bolts that hold the two rubber pucks where the tank sits haven’t vibrated out. If gone unchecked, they will vibrate against the tank and eventually wear a hole clean through. Regardless, add some locktite to their threads.
Are those the two pucks that are in a vertical position and a hard plastic/rubber or the smaller ones that lay flat under the tank and are almost like a thick washer?
The two vertical ones where the grooves on the front of the tank sits.
Location #14 in this link?https://www.parts-motoguzzi.com/moto-guzzi-motorcycles/750-MOTO-GUZZI-MOTORCYCLES/V7/2016/V7-II-Stone-ABS/FRAME/Frame-I/457/12/1193002142/1112
Yes. And #12 are the bolts you should check for tightness and Locktite.It’s been years since I did it on my now gone ‘14 Special, but if I remember correctly you don’t have to disconnect the pump and remove the tank entirely. Take the seat off and remove the rear tank bolt. Then lift and slide the tank back far enough exposing those rubber pucks.
I just noticed something. if you are at the front of the bike looking at the headlight, there are 2 screws. One on the left side and one on the bottom. Looking at the gap in the headlight, these screws go into some type of spring.The bottom screw is very tight. The screw on the left has play. Enough that I can get my fingernail under there and move it in and out maybe 1/2mm or less.I'm wondering if this could do it. Are these screws supposed to be tight or does that bugger up the headlight aim?
Take the headlight out and go for a ride..
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