Df40

[PapaSam]

I have a df40 not running properly at full throttle.its my first four stroke.runs great sometimes then dies back down to about three quarter throttle....im old school so I don't know much about fuel injected four strokes......when its not running properly it sometimes picks back up with no warning for a few minutes.please help

[artdf175]

A little more information
What year df40
Any alarms?
Not real familiar with your 40--
But some basic question regarding fuel fresh or old
Clean all fuel filters
Could be debris in carb or is yours EFI
Just not enough info for us to help

[Solarman]

df40, not running well high speeds

Hey Art if fuel injectors, I think efi.lol. Must have partied hard last night.
Art may be right About fuel. Check filters, pump bulb to see if motor picks up.
Post info as Art suggested and anything you have done so far.

[artdf175]

Hey Art if fuel injectors, I think efi.lol. Must have partied hard last night.
Art may be right About fuel. Check filters, pump bulb to see if motor picks up.
Post info as Art suggested and anything you have done so far.

==============
what was I thinking?
with that being the case....there have been a number of problems related to the high pressure fuel pump and if I am not mistaken another filter

and there was another post not too long ago about someone's motor not running well and it turned out to be a voltage problem being created by a battery going bad. replaced battery and problem solved

one more thing that could effect running is fuel tank venting.. depending on fuel tank arrangement, if your fuel tank vent is closed or plugged - creates all sorts of problems on how the motor preforms

Art

[PapaSam]

Not sure what year it is. Will check into some of your suggestions and see what happens. Thank you.

[artdf175]

3rd link from the top will take your serial and tell you what year the motor is