Search results

  1. R

    Prop size

    I have a 1993 crownline with a 4.3 lx engine. I have noticed that when i go to full throttle my engine will go up to 5400 rpm. The book said it should be around 4400 to 4800 rpm. The speed of the boat at 5400 rpms is 50. I have check to make sure the tach rpm's is correct with my shop meter.<br...
  2. R

    What is the correct procedure for Thunderbolt IV

    I was told by a Crownline dealer that to correctly time a Thunderbolt IV system, you need to put it a certain mode. He said something about grounding some wire.<br />My manuel does not talk about this at all. The engine is a 1993 4.3 Liter LX.<br />Does anyone know what that procedure is?<br />...
  3. R

    Timing Thunderbolt IV systems

    I have had problems getting my boat to plane out. It is a 1993 Crownline with a 4.3 lx engine. I got some good advice from the this forum and now I have more questions.<br />I checked the base timing and it is 8 degrees before top dead center. I took the rpm's to 2500 and it advanced to 4...
  4. R

    Timing Thunderbolt IV systems

    I think my 4.3 liter is lacking performance because the ignition is not advancing the timing. I'm not for sure how the Thunderbolt systems work. This system has a module connected to the back of the distributor and a pick up module inside of the distributor. If you have any information on this...
  5. R

    Poor engine performance

    I have a 1993 4.3lx liter engine with 144 hours on it. The problem just started about a month ago. The boat use to go onto plane very fast. Now it takes forever. I have also noted a drop in rpm's, Used to be 5500 now 4200. I've done a compession test and they all read around 185 psi. I have...
Top