ok, first, you have to give credits. That isn't your track. Now some people think that's your track, but it's not! So, give credits to the original track maker.
Make it heavier, and use bigger(not longer) chain, that should work, if doesn't, try autobrak+inf power on the hinges of the chain. that may slow down the engine though
Giving credits goes like this: You search the original scene maker from phunbox 1 or 2.
Then when you use the stuff, you write his/her name on description box like "Car made by Mr. Crash".
Guys, they're young, thanks to nice Algoryx Algodoo videos, they have come to try this out. Apparently they don't know that they should not to spam Algobox with these "learning" scenes. or then we're getting seriously trolled
The idea is, that You inform other's, who has made the stuff what you have taken from others . Like in this scene, you just took that car from me. Now somebody could think that you made the car.