Df250tx loss motion on throttle from idle to 1400 rpm

[Rerfuel]

Has anyone had a hard time controlling engine speed from 650 rpm to 1400 rpm? I have a new Df250tx and the throttle will jump to 1400 rpm from idle and it almost impossible to back down the rpm from 1400 to 1000 with out going to idle. It seems there is too much loss motion in all the cables and bell cranks . Docking the boat is dangerous with the throttle jumping up without control.

[artdf175]

I saw your post several days ago but thought someone may be more familiar with the issue
have not seen other posts that have dealt with this problem
Is it convienent to take back to the dealer that did the installation?
Your engine should be under warranty
Now having said that it is sounding to me like the throttle cable is not adjusted correctly or is binding up
You should be able to observe the movement of the cable - get someone to move the throttle while watching where it terminates on the starboard side of the engine
If it not something simple like that go back to the dealer

[redlowrey]

Has anyone had a hard time controlling engine speed from 650 rpm to 1400 rpm? I have a new Df250tx and the throttle will jump to 1400 rpm from idle and it almost impossible to back down the rpm from 1400 to 1000 with out going to idle. It seems there is too much loss motion in all the cables and bell cranks . Docking the boat is dangerous with the throttle jumping up without control.

I would have thought your engine would be drive by wire, didn't think they had cables that would make more sense to your problem.

[Rerfuel]

df250tx

The dealer and the Suzuki service rep have worked on it 6 times, they replaced the cables and the remote control, it has improved but still very sloppy from 650 to 1400 rpm. this is a mechanical control, shame on me, I thought all new engines were fly by wire. Suzuki said there is nothing left for them to do, so it must be right.

[artdf175]

I'm not buying what you say they are telling you
If you need to run at 1000 rpm it should be very easy to do
If you slowly move the throttle control the rpm ahead likewise slowly advance
There should not be a wild jump on rpm like the engine finally realizes the throttle control has advanced
Again I would observe what is going on at the engine where the cable terminates there must be something binding up until enough pressure causes the control levers to advance
You could also get a second opinion find another dealer
Good mechanics can be hard to find
Good luck with it
Art

[white diamond]

My 2004 DF250 does the same, just maybe not as bad as yours. Had the cables replaced but did not help. Carried to two different shops and they could not help. I am looking forward to the day I can re-power with fly by wire.

[redlowrey]

The dealer and the Suzuki service rep have worked on it 6 times, they replaced the cables and the remote control, it has improved but still very sloppy from 650 to 1400 rpm. this is a mechanical control, shame on me, I thought all new engines were fly by wire. Suzuki said there is nothing left for them to do, so it must be right.

Mate no engine would flat spot between idle and 1400 unless there was a problem with it, could you imagine having a new car and every time you took off, it would flat spot then go to 1400 rpm, it would be fixed in no time. take it to a good auto mechanic, If you came to my shop with that problem, I would be checking to see if it had a closed throttle position switch, or a variable signal switch, map sensor and check them with a scope and a scope meter connected to the injectors to see if there is a shift in pulse width when the throttle is opened. it sounds like to me that the pcm is not seeing the shift in throttle position.

[Harper]

I have a similar problem, but can't tell for sure by your account if it's the same. I do have (or HAD) a problem of the friction on the throttle lever letting go right around the same 1400 RPM level, where I have learned to very easily pull the lever back to prevent it going all the way to idle. I have made adjustments to the friction and checked the cable and can find nothing wrong, either. On mine it is NOT a matter of a flat spot in the throttle position, but rather a point in the travel of the lever where the friction just sort of "lets go," allowing the lever to slip all the way to the idle position. I have learned to overcome it by a gentler touch. It does not come into play when maneuvering the boat to dock, only when coming off plane and gradually slowing to a no wake RPM. I try to reduce to 1200 RPM or so, which gives the 5 MPH no wake speed on my boat. But it is touchy getting there without backing all the way to idle. If I back the friction screw out far enough, it will not occur, but at that light of a friction setting, it also will not hold the throttle at RPM without backing itself off while on plane. As I would prefer not to have to hold the throttle in position all the time, I have increased the friction back to where it will hold RPM. I've just learned to live with it. It is not in the cable, or in the engine throttle lever, but in the remote throttle assembly.

[swjjws]

Same problem with our new small block 250 installed last year. Mainly from idle to about 1200 rpms for us. Trying to run in any rpms in that range is a challenge. Haven't tried changing cables but we did use brand new cables, new control box etc. when installing. After our experience and above posts I can only say it is a very clunky Suzuki control box.

Suzuki should offer this engine with fly by wire or a decent control. Also this engine has no optional battery isolator lead set for your house battery. Other than that the engine has been wonderful.

[formula233]

I had a 2008 df250 and never had that problem. Have you tried looking at whats going on without the engine running. Get someone to move the throttle while you watch how all the linkages are moving. I bet you will find something sticking or binding.

[redlowrey]

Surely it could not be that hard to work out whether it is a cable problem or an electronic problem.

[white diamond]

If you had one of these "lemons" you would know what we are talking about. I gave up trying to fix it years ago and learned to live with it. I would demand a new motor if it were a new motor still under warranty.

[Rerfuel]

df250tx loss motion

Suzuki is sending out a fly by wire engine to replace it, they implied that it was a common caricaturist of this engine and the only way to fix it was to replace it. it took 5 months of complaining before they agreed.

[Harper]

***! Good news! Good for Suzuki, and good for you for keeping on them.

Edit .... (Oh, I forgot that the word w-o-w is banned )