Hello everyone I am new here I recently picked up two nitro cars used the car I’m having trouble with is the haboa hyper 7 I had a hard time priming the engine I did plug the exhaust with my finger and open the throttle all the way I had pulled my pull start probably 50 times then the engine finally fired up while I was breaking in the motor I had decided to do some low speed driving and trying to tune the car it would bog out and die iknow it was to rich but you see I had tried to start it again but when I did I broke the pull start I removed the engine and tried to fix it but the plastic part was cracked and long story short I don’t wanna deal with a pull start anymore and would like to convert to roto start I don’t know what one to order I do have the factory .28 engine in it