As with all belt manufactures ...there will NOT be any warranty returns as they will not accept any returns due to varied fitment conditions beyond their control. Belt tension setting tools & alignment equipment are available. Remember to do belt tension check and adjustment after 50 or so miles, along with 250 & 500 & 1000 miles, along with your models maintainance schedule. It is always best to understand why it needed replacement in the first place ....as the life of the belt will be shortened, if there is an ongoing problem for example... if you have a worn or damaged front or rear pulley, or a misalignment between them. Check your Lower Belt guards actually do prevent stones from entering between pulley & belt and punching through, and that the correction tension is applied.
BDL Belt information on this subject... is as follows
We do not manufacture any belts. Improper handling of belt, twisting, pinching or prying during installation. Improper belt alignment, toe in or toe out, chamber tilt left or tilt right, vehicle alignment early model FXR’s, FXD’s, FLT’s. Improper belt tension: too tight, too loose. Worn out pulleys not replaced at time of belt replacement. Oil leaks that cause oil to penetrate belt, chemical reaction to rubber.
Air suspensions that cause improper belt tension/alignment, raising or lowering the bike by air or broken shocks. Failure to properly readjust new belt as it seats into pulleys at 500 and 1000 miles, and at regular services. Road debris, rocks, metal, glass, tire tread or retread pieces, etc. Failure to properly readjust belt on bikes overloaded for long trips.
Harsh chemicals used to clean motorcycle, chemical reaction to rubber. Racing, burnouts, wheel stands, all affect tension and alignment. Worn or broken pulleyisolator rubber/s. reverse over bending of belt. Belt that rubs or has constant contact with upper belt passage way portion of inner primary housing, motorplate or starter pinion gear, lowered bikes.