| Author |
Message |
    
M1combat
| | Posted on Monday, June 15, 2009 - 05:58 am: | 
|
Count me in as a stretched front con-rod owner  .
I just threw in the '08 crank/conrods and some forged pistons and all is well .
Happened about 45K miles...
(Message edited by m1combat on June 15, 2009)
(Message edited by m1combat on June 15, 2009) |
Mnbueller
| | Posted on Monday, June 15, 2009 - 07:59 am: |
|
Were all these engines using the same oil? I'm thinking since it doesn't seem to be a problem here in the states, maybe the Oil is the culprit? Just a thought. |
Rotor
| | Posted on Monday, June 15, 2009 - 03:31 pm: |
|
no idea for the oil type. probably not oem for all bikes |
2_spuds
| | Posted on Monday, June 15, 2009 - 05:16 pm: |
|
Did buell switch from the double tapered roller bearing on the sprocket shaft to the single roller like the sportsters did
in 04?
When harley switched to the single roller
on their big twins in 03 some people where having crank failures when they started adding some horsepower.Zippers Performance
http://www.zippersperformance.com/catalogue/showpr oduct.asp?cat=850&prod=2065
and some local builders recommend retrofitting the double tapered bearings.
The buells put out more horses than the sportsters so maybe they are over stressing
the single roller. My 06 uly shows a single roller on the sprocket side in the parts book but I don't know what year they
switched. 04 is when they did away with the trap door tranny and the double crank bearing on the sportsters. |
Fx1200
| | Posted on Wednesday, June 17, 2009 - 08:51 pm: |
|
It appears BMC made a attempt to address any potential lower end failures by giving the crank pin a flash coating of silver starting in the 2006 season.
This acted as a dry lubricant when the lower end was at max revs and the loading on the rod bearings was extreme due to the very high piston speed.
It appears the potential problem was resolved with the '08 lower end having the larger diameter crank pin/bearing which tolerates these high loads. |
Rotor
| | Posted on Thursday, June 18, 2009 - 03:54 pm: |
|
BMC ? |
Fx1200
| | Posted on Thursday, June 18, 2009 - 06:29 pm: |
|
Buell Motorcycle Company |
T9r
| | Posted on Tuesday, November 08, 2011 - 01:05 pm: |
|
This past Summer (2011) my 2004 XB12R created a knocking sound and proceeded to crap out like others experienced here. I have approx 24,000 miles on the bike. Stock motor, with Race ECM and Buell Race exhaust. |
