At BP Racing ATV we will accept returns within 30 days for almost any part that is new, unopened, never installed, and in the original packaging. If you wish to return an item, it must be returned in the same condition in which it was received, and it must include all items that were in the original package. If the returned item is used, damaged, installed, missing any parts, not in the original packaging the cost to replace those items will be deducted from your refund. Return shipping is the responsibility of the buyer. We ALWAYS STRONGLY recommend that these parts be assembled and tuned by a qualified mechanic with experience working on these types of engines. Warranty does not cover any part(s) failure that is a result of improper installation, improper tuning, improper break in, or misuse. For any warranty to be considered the part(s) in question must first be sent to us and possibly the manufacturer for inspection, no exceptions. Return shipping for a warranty is the buyer's responsibility but we may reimburse you for those costs to a certain point. We can not warranty parts based on photos or phone calls alone.