| Author | Message | ||
     Blazinc5 |
I have a 2005 XB12R with 30K on it. But I recently snapped the drive belt. I got the replacment from HD and at the same time I changed the rear tire. I did all the work. But, Now I am getting a whine from I am assuming the tranny. (hard to tell cause I am riding when it makes the sound). Essentialy, it makes the sound in all gears under load but goes away after about a second when the load is removed. As in pull the clutch in or just drop it into neutral. Varying the rpms does not make the noise come back nor does having the clutch in or out... All that seams to matter is the bike is rolling faster than I can run and I just removed the load from the drive train, then it goes away. But as soon as I put the load back on it, the noise is back. What really makes me wonder, is that it takes a second for the noise to go away. I checked the tranny oil and the primary chain tension. Both are good. But putting the new belt on was a royal pain. It was Much tighter than the older one ever was. It was pretty difficult getting the idler pully back on with the axle fully loose. Is that normal? Does anyone have any idea's what could be causing the whining sound? | ||
| Natexlh1000 |
New belts are crazy tight. You can play them like a fiddle. You might just be hearing the back of the belt going over the idler. I would suggest putting a couple hundred miles on the bike and it will probably go away. (Or finish breaking!) | ||
| Brother_in_buells |
check the front pulley/bearing (without the belt) and how are the bearings from the idler pulley? | ||
| Arctic9r |
The front pulley mainshaft bearing probably isn't liking the new tightness and strain from the belt. You may want to adjust your suspension now due to how much tension has changed with the belt. | ||
| Fast1075 |
"New belts are crazy tight"....yup...ran into that problem myself...it concerned me so much, I bought a Free Spirits tensioner from Matt at Adrenaline Moto. Problem solved. | ||
| Deanh8 |
I bet that noise you are hearing is your bearings in the idler... im willing to bet thats the same reason the belt snapped in the first place also. | ||
| Blazinc5 |
I think before I order parts I will probably take a closer look into the idler. I may just look at modifying the old assembly to loosen up on the belt a lil. There are good benefits of beeing a machinist. lol I don't think though that the idler was the culprit when the belt snapped. It was an old belt with over 30K on it and was not tight at all. The quick 1-2 shift pulling front end off the ground about a foot is what did it. Gotta love the touque. I will try to adjust the preload of my suspention first off, then look at the idler and bearings I guess. I also thought about getting one of the free spirit idlers, but looks pretty spendy for a "may fix the issue" thing. Gotta try a few things first before I go that route. I just wish I had more time to mess with the bike. Work is crazy busy and I'm pullin 6-12's. But the weather is getting nicer so I have to get the bike up and running. The fuel prices demand it. lol Thanks for all the suggestions, and keep them coming if ya got any more. My worst fear is something in the tranny. | ||
| Nobuell |
Blazinc5 When installing a new belt, the tension was extremely high. When riding two up, the bike had a tight belt sensation when hitting bumps. I posted the following awhile back: I could not find much information regarding belt tension from Goodyear. Gates has a very good manual on belt tension for their Polychain belts that are similar to the stock belt. Using the Gates data, a new belt tension should be 108 to 118 lbs for .375" deflection (top center pushing down). A used belt should be 78 to 88 lbs for the same deflection. When I changed my last belt, the tension was way over the new value. I slotted the pulley bracket mount to achieve the above tension. Since then, I have not experienced the two-up tight belt sensation previously referenced. I believe the pulley arrangement to be a sound design. I believe the problem is a stack up of tolerances and variables regarding swing arm length, motor location and belt length that may over tension the belt. After a few thousand miles of operation, the belt tension is within the correct tension range for a used belt. |
