Serious question... Is keeping the weight down really an issue...All back on, rebuilt and an additional pre filter fitted. There's literally no room for it so the filter is on the axle for now.
Tried to fire her up and the starter decided it wanted to join it's predecessor in the scrap bin.. the standard ones don't like the extra compression.
New one is currently in Memphis Tennesee. Its a high torque lightweight one.
... Surely you should buy a cheaper (heavy) one and place it above the back axle to help off the start line!