TBW9197 TB Parts Kit Consists of TBW1520, TBW1521, TBW1522 TB 130cc Big Bore Kit Bolt on big power with TBparts.com new 130cc Bore Kit for TTR110s (All Years) -Lightweight high compression domed piston with rings, pin, clips (91+ Octane Pump Fuel Safe!) -55.5mm, this is the biggest bore kit you can install without needing machining to the cases (case boring). These are high quality parts and definitely will dramatically increase the power and fun factor on your bike! There are no installation instructions, but if you can replace your piston, you can install this kit as the parts are installed in the same manner as the OEM parts. However, its highly recommended that a professional install this kit and make sure its tuned properly to prevent a lean condition and damage to your engine. Check my other items. Can't find what you are looking for? Just type in what you need in the search box above and click search. Shipping: Calculated shipping and handling amount. Upgraded shipping available. Will ship multiple items for a reduced price. The more you buy, the more you save. All items in STOCK and shipped same or next day after payment Monday through Friday. Payment: IF BUYING MULTIPLE ITEMS REQUEST A TOTAL BEFORE PAYING! IF YOU DO NOT REQUEST A TOTAL AND MAKE PAYMENT THERE WILL BE NO REFUND. YOU MUST REQUEST A TOTAL BEFORE PAYING. PA residents must add 6% sales tax. Always include your FULL shipping address. All payment and tracking information is automatically emailed to you. Payment expected in 5 business days. Outside of US buyers are responsible for any tax or fees your country charges you, and no item will be shipped as a gift. Returns: 7 day return policy. No returns after 7 days from receiving item. Does not include electrical or engine parts. 20% restocking fee. Must be returned in original unopened sealed package. No returns on any opened, installed, or used part. No exceptions. Buyer pays return shipping and refund is for item price only, not shipping cost. Refund is store credit only.