Brute Force 750 4x4i, power loss

[LAVRx]

Hello!

I have n problem with my Kawasaki Brute Force 750i 4x4 2008year. I already changed fuel pump, because ATV was loosing power. When I started ATV it works ok, bet when i ride ATV for about 15 minutes it starts to loose power. Also there was an really loud shots from exhaust. So I and mechanics though it was fuel pump problem, but when I changed fuel pump problem still stayed.

So we think that there is an problem with fuel pump pressure, maybe someone knows optimal fuel pump pressure. We can measure pressure, but we don't know the right pressure to compare it.

I'm newbie in this forum and sorry if this isn't the right place to write this thread, and also sorry for my English.

[RCW]

I assume you have kept the cam chain adjusted and the valves adjusted, have not dumped it and damaged the sensor that shuts down if it has been rolled, etc.

You will be bucks ahead to take it to a dealer and have the codes scanned or you will be throwing money and parts at it forever unless you just happen to hit the problem.

I doubt the fuel pump is the problem, or ever was. It may be a fuel related problem, or a sensor problem, or one of a dozen other possibilities.

If this were being brought to my shop, my first question would be when did you last test the battery to know it is fully charged, and not starting to go south? The ECM and fuel control circuitry on these are very sensitive to correct battery voltage.

If the battery starts going south it allows the system voltage to rise too high during running operation and then it fries electronics as fast as you throw new ones at the rig.

If the battery were good, then my next question would be what kind of fuel stabilizer do you use, and what is the longest old fuel was ever allowed to set in the ATV? Old fuel, fuel more than three weeks old that has not been stabilized, forms gum and that can plug the injection system, the filters in the tank, and create major problems for the sensors.

If old fuel was run or allowed to set for more than a few weeks in one that is stored or parked, then it needs a major fuel system and injection body cleaning. Not something the average home mechanic should tackle as you can ruin expensive sensors or even fry the ECM attempting anything much beyond cleaning the in-tank screens and lines to the injection unit.

[LAVRx]

You see problem is that the only kawasaki dealer in Latvia and official mechanics could not solve the problem or find the root of this messy problem.

Though i'll check battery if it's ok!