Looses power after 10 miles.

[Bear in the woods]

Doesn’t smoke, just gets really really weak. Cools. Then. Runs great for another 10. I’m thinking maybe the coil. But possibly the module on the distributor. All was replaced years ago. Then she sit parked for a few years. It’s extremely consistent! Expectally whenever my wife is riding with me

 

[Blmpkn]

Your probably on the right track.. coil or tfi module.

 

[rusty ol ranger]

Could be a plugged cat as well