That is what i took off. I wanted a longer run time. I think i messed up. You have to live and learn some how. It cost some time. I like to have a really powerful motor that can run a long time. I don't worry so much about speed as i do power. I like the 7 xl. But wanted to see if i could improve. I thought the motor would be bigger too.

What does it mean when you turn the cooper wire black inside the motor?

Gear down the 7xl and you will get a longer runtime. For the most part, the only way to get more power or runtime or both (of any significance) is by adding power (cells).

If you go up in cell count do you have to change gearing for that to.

Typically, as you add cells, you want to drop the gearing or you will only draw more amps(basic electric theory). Short answer- yes.

Now that is something i had no idea about. That would explain a lot.

Black windings means you burnt the motor windings up(must have missed that post). It must have been scorching hot!

I going to go back to 7 xl and go from there. I need to get me some smaller pinions now. Any suggestion on gearing for truck.

What about if I go to a 10 or 9 XL.

Assuming ytou have stock sized tires and diffs, I would start with around 15/70. This puts your speed in the mid 30s, but should give you a nice runtime and killer torque.

I was running a little taller than stock. Running the 40 series dirt hawg. I have some light weight tires I may run. I have the standard diffs with aluminum diff cups robinson gears.

15/70 should still be alright. 14/70 would drop the speed a touch and increase the runtime a touch.

Thanks Mike. You have made me see alot of things i did wrong. I have to get me some smaller pinions or lose some serious weight.

Yeah, your truck is almost twice as heavy as my race truck!

The scale I used may not be totally accurate. It should be in the ball park though. I know if i switch tires and wheels i can loose some. The batts are heavy. They add some serious weight to truck. I don't race so I can't see expense of lipos.