4 degree ignition advancer are their worth fitting?

[Tmation]

First check that the air filter intake isn't blocked (spare gloves or a cleaning rag are favourite here).


Check your air filter is clean while you are there.


You also need to check that your EXUP valve is working correctly, it sounds like it might not be fully opening. If there is too much slack in the cables you wont get the 7000 rpm fault code.