I recently bought a Rx-1 traxxis mini dirt bike. When I pull start it , the back tire spins. Bike will run fine with the rear tire lifted off the ground. As soon as set it down the bike stalls out. ... ok here is what I need help with ... I figured this was a clutch problem. So I bought a new clutch and a new transfer case ( bell housing). I installed them today thinking for sure it would fix the problem. It did not. I also adjusted the carburetor idle down to make sure it wasn’t idling to high to engage the clutch. What could this be and what do I need to do to fix it.