So I don't seem biased, here's a list of sponsor warranties. Some have additional info relating to what doesn't qualify, such as fuel line, etc, and additional info relating to what kind of stuff you can do to your motor to have it voided.
PirateCycles1.com:
Due to the nature of our business We do not exept returns. However, We will Guarantee that our products be free from factory defects or they will be replaced as long as they are unused. Sorry for any inconvenience this may cause.
GasBike.net/KingsMotorBikes.com (owned and operated by Nationwide Access, LLC.) allows returns on products that are in new condition and are returned in the original packaging. "New condition" means that the product has not been installed, fueled, started or ridden. All returns must be called in or emailed in advance. Please call 877-354-3733 for a Return Merchandise Authorization number (RMA) for shipping the product(s) back to us. Return shipping and insurance charges are the responsibility of the customer. Any merchandise returned without a RMA or any merchandise returned freight collect is subject to being refused.
HelioBikes.com
Please contact us directly before shipping any goods back to us for return and/or refund. We have a 20% restocking fee on all returned orders. The customer is responsible for all shipping costs on returned items unless covered under warranty. We will not accept any used items for return or refund unless it is a manufactures' defect or you have spoken with us directly. We do not accept any returns on our gas powered motorized bicycles or bicycle engine kits once the engine has been fired because we cannot judge the amount of wear that has been put onto the motor.
RockSolidEngines.com.au
Q- Do I get any warranty with this engine kit?
A- Absolutely! There's a 30 day warranty on parts and assembly.
BikeBerry.com
What is the warranty coverage on your bicycles?
All of our bicycles come with a 60 day warranty on frame failure and 30 days warranty on parts against any manufacture defects. The manufacture will replace any defective parts within the warranty period. Damages caused by misuse, improper maintenance or neglect are not covered by the manufactures warranty.
ThatsDax.com
DAX FRICTION DRIVE KIT ! 1 Hour Install. Works Wet or dry.
1 year Warranty.
RawMotors.com
·What is the warranty for our engine kits?
All Raw motors that have a Raw Motor plate on the engine carry a 6 months warranty.
Zone8Cycles.com
WARRANTY:
All of our Bicycles are sold with a limited 30 days manufacturer warranty with picture damage sent to us. Our Bicycle Engine Kits has a damage or missing when received warranty. You have 48 hours to notify us for damages or missing parts after 48 hours we will assume you are satisfied with product(s).We're giving you a full 30 days warranty on our regular engines and 6 months warranty on our RAW engines. However, this will not cover engine seizure if the correct ratio of oil and petrol is not used. We guarantee that all of our products are brand new and in the original manufacturer's crate or box free from defects. The warranty covers only factory defects. Any outside repair labor charges, down time or shipping charges are not covered under warranty. We do not cover misuse or broken parts caused by the user.
PistonBikes.com
Warranty Disclaimer
This site and the materials and products on this site are provided "as is" and without warranties of any kind, whether express or implied. To the fullest extent permissible pursuant to applicable law,
www.PistonBikes.com disclaims all warranties, express or implied, including, but not limited to, implied warranties of merchantability and fitness for a particular purpose and non-infringement.
www.PistonBikes.com does not represent or warrant that the functions contained in the site will be uninterrupted or error-free, that the defects will be corrected, or that this site or the server that makes the site available are free of viruses or other harmful components.
www.PistonBikes.com does not make any warrantees or representations regarding the use of the materials in this site in terms of their correctness, accuracy, adequacy, usefulness, timeliness, reliability or otherwise. Some states do not permit limitations or exclusions on warranties, so the above limitations may not apply to you.