I run a motor saver and never had a problem. Just be sure with any air filter you use to make sure it's securely fastend to the carb, you clean it after every run and use air filter oil. These are the big ones. If you take care of these you should never really have a problem with your air intake. I don't think the air filter on these engines makes that much of an improvement if any just keep up with the maintence tune correctly and the air filter should be the least of your worries.
