| Author | Message | ||
     Ft_bstrd |
Now that the weather is getting a little cooler, I have noticed that I have a vibration as I accelerate through 4000-4500 rpms. It is not gear specific. I noticed it after I had not ridden the bike for about a week and the weather was in the low 40s. I didn't notice it as much yesterday as it was in the low 80's here yesterday. There is no loss of power and it doesn't run rough, I just feel a vibration through the seat of the pants and through the handle bars and pegs. At 4500+ it smooths out and it is smooth up to 4000. Has anyone else noticed this? Is it temperature related, frequency of ride related, or do I have some sort of mechanical problem coming up? I'm coming up on my 5000 mile service, and I am going to have the TPS reset and timing checked. I am considering of replacing the spark plugs as well. Thanks. | ||
| Blake |
Jeremy, It might be prudent for you to verify that the primary chain is not too loose and that the exhaust tract is all nice and buttoned down, including the header nuts. Everytime I've ever noticed a change in vibration in my Buell, it's been caused by an issue somewhere in the exhaust tract or primary drive. | ||
| Johnnylunchbox |
Yesterday, I noticed increased vibrations. At one point I started the bike and heard a change in the exhaust note, and my check engine light was on. I suspect the IE valve got stuck open for a bit. I shut it down and restarted it and it was fine. I also am hearing a clacking in the primary area so I suspect a loose chain as well. | ||
| Ft_bstrd |
The primary chain is due for adjustment with the 5000 mile service, so that will probably take care of that problem. I had the side stand recall done, so I will have them check the exhaust clamps. I suspect it's the primary chain, though. I hadn't thought of that. Would it resonate for a particular RPM range and not anywhere else? I have the race kit, so the exhaust valve is no longer an issue. | ||
| Bluzm2 |
I notice more vibration on my M2 and my S2 when it's cold out. I'm pretty sure it's the isolators getting stiffer due to the cold. I notice the difference when the temp drop to around 45 or so. But, do check for other sources of a vibration to be sure. Brad | ||
| Tx05xb12s |
I had something like this going on around 3,200 miles. It turned out to be the primary sprocket compensator nut was loose and letting the sprocket wobble. Check this and the chain tension. According to my shop manual, vertical free play for the chain should be 1/4 to 1/2 inch cold. (05 service manual). You should be able to prod both with a screwdriver through the inspection cover. It also says in order to get an accurate measurement, you'll want to rotate the motor to check the chain in a couple of different points to get an average. The chain tension adjuster is the bolt sticking out of the bottom of the primary cover right in front of the shifter petal. | ||
| Pwnzor |
Sometimes my blender full of nickels sounds like some of the nickels are missing, more perhaps more have been added. I can't really be sure since half the sounds I hear in my brain don't even exist. | ||
| Blake |
"Would it resonate for a particular RPM range and not anywhere else?" Absolutely. Anything that vibrates will have a few specific frequencies that cause a resonance, just like that of a guitar string when plucked. The spec for primary chain adjustment is not 3/8" to 1/2" cold, it is advisable to run it even a bit looser than that, around 5/8". A too tight primary chain can cause serious harm to the engine and transmission bearings. Be sure to only set the chain free play at its tightest position as it travels around the sprockets. Why the free-play requirement? As the aluminum alloy engine and transmission cases heat up they expand at double the rate of the steel primary chain, thus causing the chain to tighten. | ||
| Xring |
My XB9 has a strange vibration only with a full tank of fuel and cooler air temperatures. About 1 cycle/sec frequency. I'm convinced it is intake tract resonance. Comes on like flipping a switch at about 3000 rpm; it is gone by 4000 rpm (when it is happening). Checked primary chain, engine mounts, front isolator, header and exhaust pipes. Guess it is just the nature of the beast. Bill |
