I have a problem with my 570 EFI. From time to time it jerks around and it either doesn't take the throttle when I pushes it, or it increases and decreases throttle although I keeps it in one position. The machine just ran out of guarantee and the dealer where I bought it is not one of the nice dealers 😈
Do you have an idea what the problem could be?

 

Efi machines aren't the most user friendly machines to try to find faults with. Erratic throttle conditions even if the throttle isn't moved could be fuel related or could be sensor wiring related such as the tbap sensor harness or its connector or the tps sensor wiring. This is something best solved by a dealer since it's so new. On something like this best to have it checked out with the diagnostic software that can track down the problem. Try to make friends with the dealer or find a new dealer that is easier to get along with..

 

Thank you, I will check into that. I also read something bout vapor lock, caused by the exhaust. Could this also be a reason?

 

That could be from a fuel tank venting problem,vent hose kinked or partially blocked or possibly heat related if the fuel tank isn't insulated enough from the exhaust heat. These are a couple things you can check yourself. Just check that the vent tube is clear and open,you can even try it with the gas cap off for a bit and see if any change. Plus additional foil tank wrap can be purchased and double wrap the bottom and sides of the fuel tank.Plus again check your owners manual on the thumb throttle play. Unless the newer models have changed,there is supposed to be 2mm play between the etc contact points in the throttle housing.