Why would Astrotrain need to jettison weight while in space?

The Decepticons have used him for transport countless times. After escaping following the Battle of Autobot City, Astrotrain requests they lighten his burden. Why?

Intro Music by Tony Bacala of www.tfw2005.com
Background Music: https://www.youtube.com/user/teknoaxe
Song used "Aerobatics in Slow Motion"
Licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/by/4.0/

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