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  1. M

    1990 Yamaha 250 VX 76. Power drops off.

  2. M

    1990 Yamaha 250 VX 76. Power drops off.

    I actually took the boat to a so called mechanic. He rebuilt the carbs and charged me $850. I took the boat back to the lake and I was in shock to still have the same problem. I contacted him and he said he would need to check the electrical. I just decided I would replace the parts myself...
  3. M

    1990 Yamaha 250 VX 76. Power drops off.

    I have never checked the fuel pressure while driving the boat . All the carburetors were cleaned and completely rebuilt. The fuel pressure regulator was replaced also. I have changed all the fuel filters, all the fuel hoses, all the fuel pumps one electrical and 3 mechanical. I am totally at...
  4. M

    1990 Yamaha 250 VX 76. Power drops off.

  5. M

    1990 Yamaha 250 VX 76. Power drops off.

    On the lake.
  6. M

    1990 Yamaha 250 VX 76. Power drops off.

    This is on the lake. Will not accelerate with remote forward. Every fuel pump component on motor replaced and carburetors rebuilt. All 6 of them.
  7. M

    1990 Yamaha 250 VX 76. Power drops off.

    1990 250ETXD
  8. M

    1990 Yamaha 250 VX 76. Power drops off.

    Well I changed all the electrical components stator, computer, and pulsar coil. Still have the same problem. I cranked the motor and warmed it up in driveway, checked compression afterwards and all 6 are in the 115 psi range. I am totally lost here. I even connected a portable tank to isolate...
  9. M

    1990 Yamaha 250 VX 76. Power drops off.

    Engine starts and idles fine. When advancing throttle engine accelerated then power drops off quickly. If throttle is not retarded then engine might surge up and down, Engine might vibrate excessively. The oil system is removed and gas is mixed. All oil lines are capped both oil tank plugs wires...
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