I'm fairly new to wrenching on my bike. The 136-tooth stock belt broke and I'm wondering if I can use a 137-tooth belt. I've been having trouble finding a reasonably priced 136 but found the 137 nearby and in my budget.
You probably have enough adjustment in the rear tire to do so. However verify the width of the belts to make sure they are the same. Older belts were 1 1/2' wide and yours should be 1 1/8". It looks like the '04 1200 XL used the 137T belt.
tourbox