motor cuts out under long WOT

[sean]

Hello All,

I have a 97 KDX 200. FMF pipe and everything else is stock.
When I am running 6th gear wide open the motor cuts out completely once the revs start to reach their maximum. Soon as I let off it runs like normal.

Motor runs perfect in all other conditions. My orginal thought was jetting but it runs really good 99% of time... its just the ocassional wide open runs.

Thanks
Sean

 

[Dirtdame]

Make sure that there isn't any water or dirt that might have gotten into the float bowl.

 

[_JOE_]

I'd check the float height and fuel supply lines/filter(s).

 

[sean]

Joe, that makes perfect sense now that you said it... I am going to bet that is it.

Thanks

 

[mudpack]

I'd check the float height and fuel supply lines/filter(s).

I agree. Sounds like a fuel flow issue. Make sure you have a strong flow coming out of the tank's petcock.

 

[dirt bike dave]

I agree - sounds like fuel flow.

If you are running a fuel filter, remove it and do a test run. Those filters will flow less as they get old, so if you feel the need to run a filter, replace it with a new one.

There is a screen in the tube that feeds the petcock - disasemble and clean.

Also, make sure the vent in your gas cap is not obstructed and that the breather line is not kinked.

 

[sr5bidder]

I agree - sounds like fuel flow.

If you are running a fuel filter, remove it and do a test run. Those filters will flow less as they get old, so if you feel the need to run a filter, replace it with a new one.

There is a screen in the tube that feeds the petcock - disasemble and clean.

Also, make sure the vent in your gas cap is not obstructed and that the breather line is not kinked.

and too the carb vent tubes (down by the swing arm) are most likely dirty and pluguged.......cut a V shaped notch at the ends off them to help keep them from plugging with dirt/ mud

I had same problem as you but worse ( bike cut out completely) and found the vent hoses from the carb where plugged up..check them :cool: