I have 2018 F3 Limited and had vibration at same RPM as Len99. Put on LaMonster tensioner with no change to belt tension and have 2000 vibration free miles since then. Belts stretch with use and that's probably why yours developed the problem later, mine did it from day one. It was very irritating since that was my cruising RPM and BRP definitely dropped the ball on the vibration issue since it's been a problem for years. You'd think that a $28K+ machine wouldn't have those type of problems, but they failed at a number of things in the design as I have found since owning my bike.
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Vibration Question - is the 72mph vibration the belt?
- Thread starter rab1951
- Start date
Mikey
Well-known member
What's your front tires look like, are they cupped? Or do you see maybe a little wheel hopping like it could be out of balance? And do you know what your belt tension is? maybe you just need to tighten the new belt up a little!!
I just had the dealer do my first servicing, at 6,000 Km. I told the mechanic about the vibration, he said this is happens to quite a few f3 bikes, but as part of the servicing, he will check belt tension. After the service he said the belt had stretched and was below specs, so he adjusted it to the bottom of the acceptable range, similar to older Spyders. This was based on my recommendation which I had read here on this forum. Riding home vibration is gone. Mechanic said if it develops again, come in and he will adjust.
I like my dealer, friendly, courteous, honest (so far) but a bit expensive. Then again, why wouldn’t someone have a reputable dealer service a $30K vehicle to keep it in top shape? I will.
I like my dealer, friendly, courteous, honest (so far) but a bit expensive. Then again, why wouldn’t someone have a reputable dealer service a $30K vehicle to keep it in top shape? I will.
hyea::congrats:ShockwaveSpyder
New member
mine too ... I lowered the tension of the belt, ways too tight by factory, so bad, that my hands fall asleep while driving 
I´m waiting now that my son brings the LaMonster-tensioner when he comes home ...whenever 
I´m waiting now that my son brings the LaMonster-tensioner when he comes home ...whenever 
ulflyer
Active member
I've got a BRP but found I was not able to install it. PM if anyone is interested.
Supercrawler
New member
My brand new 2021 RTL had same issued around 78-80 miles my floorboards vibrated so bad feels like its comming the transmission.
Installed Lamonster damper got rid of the vibration.
Installed Lamonster damper got rid of the vibration.
Here is some background info: BRP is aware of the vibration issue. It is caused by the harmonic vibration of the belt. When the 2020 models were introduced, BRP showed a Powerpoint session in which they mention that the tension arm and roller fixed the problems on the F3, so they were going to put that on as standard equipment on the 2020 RT's. BUT, they did not do so. They did, however, start installing them on the 2021 RT's. So, the 2020's have that problem. The Lamonster roller on this arm has a larger diameter than the OEM one, which means that it rotates fewer times per mile giving less wear, plus it has an extra set of bearing to help stabilize the roller.
I contacted the dealer who was unable to do much about it except adjusting the belt tension, which did not help. Feeling that BRP should fix a problem they knew about and said in writing that they had a fix for it, I contacted BRP customer service. They became very helpful when I pointed out that they had said in writing that they were going to apply the fix to the 2020 RTs but did not do so. They opened a service iticket on it. I bought the Lamonster one myself because I wanted the larger roller than the OEM version had. The dealer installed that part for me under warranty!
I started to install the arm myself, because it had only two bolts and should be easy to do, so what could possible go wrong! But I let the dealer do it when they were doing the 3000 mile service. Sure am glad I did. It turns out that one of the bolts holding it was stuck. The dealer tried heating it, but the bolt actually snapped. They tried a bolt remover, but that did not work either. The bolt was cross threaded by the factory. The dealer had to send off to the factory to get the frame piece to which the arm attached and replace the entire assembly. I surely am thankful that I did not try that myself! They did all this under warranty. The dealer was very helpful through all this, and BRP was also, once I explained to them the written documents I had.
So all is well, at least for now. PS, I did have the main computer go out at 600 miles on the Spyder while I was in the boonies in far West Texas at Big Bend National Park, but that is another whole story. Yes, they fixed that under warranty also. (I discovered that warranty towing pays only $200. It was 360 miles from there back to San Antonio. I was able to get bock home without towing.)
So, if you are having that problem, maybe the dealer can help. If they cannot, try BRP customer service. Ya just never know... maybe they will help also?
I contacted the dealer who was unable to do much about it except adjusting the belt tension, which did not help. Feeling that BRP should fix a problem they knew about and said in writing that they had a fix for it, I contacted BRP customer service. They became very helpful when I pointed out that they had said in writing that they were going to apply the fix to the 2020 RTs but did not do so. They opened a service iticket on it. I bought the Lamonster one myself because I wanted the larger roller than the OEM version had. The dealer installed that part for me under warranty!
I started to install the arm myself, because it had only two bolts and should be easy to do, so what could possible go wrong! But I let the dealer do it when they were doing the 3000 mile service. Sure am glad I did. It turns out that one of the bolts holding it was stuck. The dealer tried heating it, but the bolt actually snapped. They tried a bolt remover, but that did not work either. The bolt was cross threaded by the factory. The dealer had to send off to the factory to get the frame piece to which the arm attached and replace the entire assembly. I surely am thankful that I did not try that myself! They did all this under warranty. The dealer was very helpful through all this, and BRP was also, once I explained to them the written documents I had.
So all is well, at least for now. PS, I did have the main computer go out at 600 miles on the Spyder while I was in the boonies in far West Texas at Big Bend National Park, but that is another whole story. Yes, they fixed that under warranty also. (I discovered that warranty towing pays only $200. It was 360 miles from there back to San Antonio. I was able to get bock home without towing.)
So, if you are having that problem, maybe the dealer can help. If they cannot, try BRP customer service. Ya just never know... maybe they will help also?
Well, the max speed limit on I-10 is 70. So if you have vibration at 72 mph, just bring it back down to the legal speed limit and the vibration should go away.
Wrong, its 80 from roughly Kerrville to El Paso, cruising at 90 GPS, you pass a few and many pass you.
Ok, I’ve heard all the arguments about having the belt tensioner but on my 2018 f3t the belt rides on the pulley part closer top the saddle bags. I did have the BRP tensioner but it got destroyed by the belt because it rode too close to the edge. A local BRP dealer did do a belt alignment but it still rides close to the edge. 
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