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Author Topic: Low RPM at wide open  (Read 18557 times)

Offline TerryF7532

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Low RPM at wide open
« on: May 09, 2015, 01:58:50 PM »
I had a bad ignition module on a 1990 XR4(carbs)(0C291052) changed it thinking it would fix the low WOT rpm problem, but it did not. when taking off, it seems to get to 4000 rpm and wollow trying to get out of the hole, with the throttle at wide open, and then on plane, it will only get 5000 rpm at full trim. any ideas will help me trace the problem, it seems run ok at idle and once on plane it is ok at slow rpm, but cant get 5400 at wot. have not change anything from original set up, it used to be just fine. i know it is 20+ but should still run better than it is.

thank you for the ideas  (hmm)

Offline Charlie

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Re: Low RPM at wide open
« Reply #1 on: May 09, 2015, 04:32:16 PM »
Terry,
Just taking a wild guess here and I mean a wild guess, are the carb jets clean?

Offline Curt

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Re: Low RPM at wide open
« Reply #2 on: May 09, 2015, 05:07:33 PM »
@Coop any suggestions for this problem?

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Offline ranger361v

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Re: Low RPM at wide open
« Reply #3 on: May 09, 2015, 08:25:01 PM »
Sounds like a fuel problem to me.
Mine did the same thing and I rebuilt the carbs and fuel pump and it worked great after that.
The floats were bad.

Good luck.

Offline ranger361v

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Re: Low RPM at wide open
« Reply #4 on: May 09, 2015, 08:25:54 PM »
But......
Have you changed your plugs lately?

Offline TerryF7532

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Re: Low RPM at wide open
« Reply #5 on: May 10, 2015, 09:34:03 AM »
yes the plugs are new, that was how i found the bad ignition module, # 3 wasnt firing, all the others show they were firing. do i need to have the carbs removed and cleaned or can i use a carb cleaner in the gas to clean them?

Offline ranger361v

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Re: Low RPM at wide open
« Reply #6 on: May 10, 2015, 10:46:22 AM »
You can try it in the gas, that would be an easy fix.
But you will probably have to take them off and rebuild them.

Offline JackJ

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Re: Low RPM at wide open
« Reply #7 on: May 11, 2015, 02:49:26 PM »
Stator maybe
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Mercury 175 Pro XS

Offline Curt

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Re: Low RPM at wide open
« Reply #8 on: May 11, 2015, 03:59:28 PM »
I'm tending to think it's not a carb problem, but more electrical or electronic, as @JackJ has suggested. But I could be 100% wrong.

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Offline idahomike

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Re: Low RPM at wide open
« Reply #9 on: May 12, 2015, 01:44:16 PM »
I might be able to help I went through this same problem a couple of years ago. Before you start spending money on experiments try this. (not my brilliant idea got it from a mechanic) Take the cover  off the motor and the air cleaner so you can see the carbs. Have someone run the boat on the water under load. Watch the fuel flow in the carbs. It should be the same in all carburetors, not one start off good and then peter out. Full flow stream through all together. You might see the problem if not probably is electrical but like others have said sounds like fuel. It was in my case. After I spent almost a hundred dollars trying to fix not the problem. Good luck. This test is free.
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Offline Curt

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Re: Low RPM at wide open
« Reply #10 on: May 12, 2015, 01:54:01 PM »
Take the cover  off the motor and the air cleaner so you can see the carbs. Have someone run the boat on the water under load. Watch the fuel flow in the carbs.

And this is assuming that your fuel lines are clear, so you can see the fuel in them, correct?

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Offline idahomike

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Re: Low RPM at wide open
« Reply #11 on: May 12, 2015, 02:01:08 PM »
No. Watch the jets inside the carbs. You'll see a stream of gas. That stream has to be consistent and steady the faster the engine runs the greater the stream. If it changes in a carb  that carb needs to be cleaned. Usually is only one that does it, but realistically if one is dirty its foolish not to go ahead and clean them all.
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Offline Curt

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Re: Low RPM at wide open
« Reply #12 on: May 12, 2015, 02:08:04 PM »
OK. Gotcha!

Definitely a great tip. Thanks  (y) (y)

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Offline TerryF7532

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Re: Low RPM at wide open
« Reply #13 on: May 12, 2015, 05:36:50 PM »
thank you for all the suggestions, i will try the carb stuff first, on the weekend when i can get it out on the water. I will keep you all posted to what i find out.

Offline Curt

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Re: Low RPM at wide open
« Reply #14 on: May 12, 2015, 06:03:16 PM »
Sounds good @TerryF7532  (y)

I hope it's a cheap, easy fix that gets you back up and running again  (yes)

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