df 140 four stroke miss fire

[90edward]

i have a suzuki DF 140, 4 stroke of 2010 and it runs perfectly as long as it is under 3000 refs. when it gets over 3000 refs it will start miss fire. can someone help me to solve this problem?

[noelm007]

I guess the first step is to do the really easy things first, replace the plugs and take it for a run, from then can you run it on a complete remote tank, hose and fresh fuel? by the sounds of it, you may need to to a spark test while running at the offending RPM (under load)

[briscoe]

Also he needs to look at the low pressure fuel filter and see what the bottom looks like. It should be opaque plastic. If it is discolored it may be a fuel problem. I have an 07 that had issues when I ran a tank of gas too low. Clogged the injectors from something in the tank.

[catacom225]

Sounds like its going to limp mode

[90edward]

i find the problem it was in the primer bulb