- Do you accept returns on used engines
No. We do not accept returns on used engines. Further to the point, I don't think we have EVER seen a legitmate warranty issue on a Zen watercooled engine. It's a hobby. If you order a hobby engine, you need to accept the risks inherent in using a high performance engine like this. You are going to have to replace parts as time goes on.
If you want to be certain you will never have a problem with an engine, simply do not run one.