Hi fellas,
I have this TB42s that will not rev past 3000RPM, It starts, Idles and drives fine but will not exceed 3k revs. It sounds more like it's being limited instead of struggling to rev higher. What could it be? I don't think it's a fuel issue, Although when I open the throttle by pulling on the cable whilst looking down the carby the secondaries do not open? Does the motor have to be running to open up? I think my problem may be the 2 springs on the rotor button but I have not yet checked. I'm after advice on what it could be, It recently had a problem where it would only run for short periods of time before dying but I found out it was a blocked fuel filter and after removing it she runs sweet now apart from the problems listed above. It used to be on gas but was told by the owner the carby was rebuilt and tuned for straight petrol. Any help is appreciated! It also has Pertronix ignition. Thanks!