number of possibilities: most likely 2= undersize battery cables, like the common ones for 12V instead of proper heavy 6V ones, and poor grounds - might also be a weak cell in the battery - or it needs a tuneup - carb iffy

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot