| Author | Message | ||
     Dc29 |
07 xb12 Started making a rough noise from bottom. 26000mi. Oil change every 3-4000mi.Still runs great but concerned about noise to the point of wont ride it any more till solved. Bike is all stock.I removed primary cover last night hoping to find loose primary drive gear. Checked torque on gear, backed it off and re tightend to 250ft. lbs.Any one have an idea. Was taking a weekend trip on it. Now might have to ride 1125R with my Harley friends and that don't ride well with those if you know what I mean. | ||
| Dc29 |
Anybody, am I the only one with noise other than the primary drive gear loose. I know the lifter noises, primary chain noise and all that. Was wondering if something on ignition side could be a culprit? Do lifters wear out in 25000mi? | ||
| Iamarchangel |
Can you post an audio or youtube? Webpage is kinda quiet and ugly noise is not as descriptive as you think. | ||
| Dc29 |
I'll see if I can get my 12yr. old to help me get some you tube sound clips.At 65-70mph roll in to throttle it sounds like piston slap from old wore out air cooled two stroke. | ||
| Bartimus |
I've never had a lifter fail on any of my Buells. That being said, I have had a lifter bearing fail on one of my Harleys at 18,000 miles. It did make noise, but also caused some running issues also, since the valve was not opening completely... I had to remove the cam cover to find the problem. It was a simple enough repair, but a bit time consuming. | ||
| Brumbear |
oil pump gear first check though would be the rotor/stator nut on the primary and the belt drive pulley nut as well | ||
| Motohead1125r |
2007 makes me think it's the lower rod bearing. I have a 2007 12R with 46,000 miles on it, and it started making a lower end noise at about 3000-4000 rpm. Lite throttle is worse than laying on it hard. I have checked the primary nut, lifters, ect. both cylinders have less than 5% leak down. I think we both have the same thing going on, and I bet it is the rod. Im planning a teardown soon, as I dont want to punch a hole in this thing. I am looking at a 2008 crank vs a darkhorse crankworks setup. Anyone have any sugjestions for the both of us? | ||
| Slaughter |
Wow - describing a sound in 1000 words or less is a DANG TOUGH writing assignment. The pre-08 motors can be weak on the bottom end if ridden hard and bounced off the rev limit often. Also as some of the others have said, oil pump drive, cam/lifter/pushrods, but also check primary chain tensioner and the rotor/stator. | ||
| Slaughter |
Oh - and I can STRONGLY recommend Dahmer's Dark Horse for a newer flywheel set installed into the older crankcases. The best of BOTH engines! | ||
| Motohead1125r |
Slaughter: You are just the person I wanted to talk to about this. If I go the 2008 + route, can or should I also do a Timken conversion at the same time? Also, what are the benefits of the Darkhorse setup. And third, what is the deal with the 07 setup, bad bearing design, or is it the rod itself/ Does anyone make a better rod for this engine? Thanks Chuck | ||
| Slaughter |
The Timken bearing conversion is for the stock bottom end (pre 08). The advantage of the 08+ flywheels in the older bottom end is that you get the BIGGER bearings of the 08 and because you don't use the flywheel position for your ignition timing (you still use the cam position) - you can ALSO have Dahmer pull almost 3 pounds of weight out of the flywheels without the magnets being needed for timing. Makes a BIG difference in throttle response also because in addition to lighter flywheels, you now have smooth flywheels - less air/oil drag whirling in the cases too. Because of the bigger bottom end bearings, you'll be able to spin it faster and if you do hit the rev limit, it won't hurt the engine nearly as much. Despite what people think, constantly hitting the rev limit is NOT GOOD. He does enough of this work that the prices and options are very predictable. Of course, you can leave the 08 flywheels in their stock weight and still have a hell for stout motor with the cases modified for the bigger bearings. (Message edited by slaughter on August 21, 2010) | ||
| Slaughter |
Hit up Dahmer directly for the list of options on this engine work, it can be pretty "spendy" if you add in balancing and some other options. Dahmer built Paul James' endurance racing XB so he DOES know these motors! | ||
| Pinball |
I have a blown up(crank,bearings,pistons,rods,etc)XB9 engine and am wondering about the timken bearing swap.Any Idea on a price for a crank etc to make it a 1203 or bigger engine. | ||
| Randlepmcmurphy |
I had this happen to my bike an 05 XB12R it made a rattling sound in the 3-4000 rpm range I had a little over 21000 on the bike when it started. Turned out to be one of the bearings between a rod and the crankshaft. This is a common failing from what I was told, it was the bearing on the rod that is split. In my experience it was about $200 in shop time to tear it down and tell me what was wrong and then about $3500 to rebuild it. If you were ever thinking about performance mods or bigger pistons this would be the time as your engine is already apart. Might not be the same problem but the odds are that it is. | ||
| Dc29 |
Thanks for the response guys.As mentioned above I'll check oil pump gear, but I'm afraid it's a lower end bearing. Noise is loudest at 1400-1600 in neut.just off idle. RPM above that it seams to go away. | ||
| Brumbear |
If the noise goes away it is usually not a bearing but a gear noise so that may be good for you I am hopeful for ya | ||
| Dc29 |
It will be a while before I can tear in to it to know for sure. My son and I are finishing out his mini sprint racing season no spare time or money.I'll post up when I know. Thanks Guys. |
