dt140 not running at wot

[km234]

i have a 1996 DT140 that I recently purchased, I had the carbs cleaned but still having problems running at WOT, engine runs good up to 4000rpms over that engine starts chirping and jumping, I can pull throttle back and go right back in and problem stops until I reach 4000rpms again, I have tried pumping bulb it is not real soft but does not seem to help any help will be appreciated.

 

[hopalong]

Re: dt140 not running at wot

First have you tried checking at that fuel quick attach fitting at the front of the motor were theu fuel line connects to? Check the "O" ring seals inside. They harden or tear after many years. And even the fitting will wear out over time. A simple replace would be to but a barb/barb fitting and eliminate the fitting.
Second, if your're sure the tach is the actual rpms and the engine is not over reving, check your fuel filter, gas condition, fuel pump diaphram, and any fuel lines that amy have a small pin hole....even the lines from or atthe fuel tank. Replace that bulb, it could be the cause also and a likely culprit.

After all that is confirmed to be ok then I would suggest you should really consider other problems...such as carbs, ignition etc. and adjustments.

 

[Outsider]

Re: dt140 not running at wot

The chirping sounds like an alarm, and you should have a light indication on the multi-function gage. Figure out what alarm and you'llm know where to look ... :redface:

 

[deejaycee_2000]

Re: dt140 not running at wot

waterflow ..... when last did you change the impeller?

 

[km234]

Re: dt140 not running at wot

changed the bulb, took the boat out again today and still have the same problem did notice that when the chirping started it is the oil light that is coming on, the rev limit light then comes on and thats when the motor bogs out. Any thoughts would be appreciated.

 

[deejaycee_2000]

Re: dt140 not running at wot

well there you go, you are not getting enough oil through when running WOT, I doubt the oil flow sensor is bad otherwise it would keep the motor in limb mode ..... but you can replace it anyway to be 100% sure .... it is always a good idea to keep the oil reservoir filled to the top ... also check all the pipes etc. for the oil ...

 

[hopalong]

Re: dt140 not running at wot

There is a small oil filter/strainer located in between the main oil line. It is replaceable. Also make sure the oil in the bottom of the oil reservoir tank has not gel-up or has gotten thick overtime. It may be restricting oil flow too.

 

[km234]

Re: dt140 not running at wot

found the oil filter/sensor unit removed and took apart, found alot of sludge on the screen, cleaned the unit real good reassembled took the boat out and she ran like she was brand new, thanks everyone for the help hopes this helps someone else as well.

 

[deejaycee_2000]

Re: dt140 not running at wot

glad you got it sorted out ... happy boating .....

 

[hopalong]

Re: dt140 not running at wot

Thats great...and as deejaycee said.... happy boating