Originally Posted by
Nitromad1020
Hi all, Just wondering about tuning and if i am doing it correctly. I have a .21 novarossi 9 port with ceramic bearings in my mrx5 WC spec and i have idled it through around 6 tanks and drove it at the local car park. All is brand new. I am very pedantic about having it sounding right and making sure there are no lean fuel mixture sounds. When i punch the throttle, it operates perfectly and very punchy. However when i am at a speed and not wanting to slow down or speed up, i notice it sounds like it is leaning out and doesn't sound healthy at all.... Any suggestions as to what i can do to fix this??
I have tried making it richer on the high speed but it doesn't really help that and the idle screw a fraction. This worries me. I am wondering if because it is built for racing and i use it as a hobby that it either wants to go or stop instead of in between. Any advice for tuning would be great and would be appreciated.
Thanks
Your description leads me to conclude that you are running at partial throttle opening - unfortunately the carbs are not very sophisticated and don't seem to like partial throttle settings (ran into the same problem while getting a new racer going last year myself and another experienced racer could drive the car and the motor sounded fine , but he'd drive it and the motor sounded horrible - we finally figured out that he was trying to part throttle the straight)