Among the things to suspect when an engine won't run up to max RPM are seized advance weights in the distributor. You can check by taking the distributor cap off, grasping the rotor and twisting. You should feel the rotor move about 30 degrees, against spring resistance, and return to the starting position when you release the pressure. If no movement, suspect a seized mechanical advance.
You can also check the distributor advance with a timing light: at idle, the timing mark should line up with the degree tab at the appropriate idle timing setting. When the engine is revved, the mark should swing away toward the advance side and advance about 30 degrees by the time the engine reaches about 2,500 rpm. If the timing mark stays static, the advance mechanism is seized. The amount of advance at a given engine speed varies according to the advance curve of the particular engine. Be very careful checking timing advance with a light; you'll be sitting down in the engine compartment with your timing light and its attendant wires right next to all those spinning belts. -- You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/unifliteworld?hl=en.
