Missing thrust and power when ride about 3500 rpm - Road Star Warrior Forum : Yamaha Star Warrior Forums

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Old 08-22-2019, 03:02 PM   #1 (permalink)
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Default Missing thrust and power when ride about 3500 rpm

Hi guys,traveling now on my warrior 2004, now about 2000 miles and 2000 more but got problem which make me sick one time when I need to ride about 90 miles, Missing thrust if you hold the RPM around 3200-3500-3800, about seconds 20-30 keep the RPM at 3000 and missing thrust, engine urbs, heard how responds to the gas handle, but does not gain momentum and pull, drops to about 2700 and thrust reappears (at 4 and 5 gear). But if we go let with turnovers of 4000 and higher, all norms... only on 3200-3900 problem..
I put new LSA but problem did not gone,took tps from my friend but problem same,also I take off power commander and put new fuel pump
I really can’t understand what to do,please need some notes what to do step by step
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Old 08-22-2019, 03:20 PM   #2 (permalink)
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No mistakes, in diag menu
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Old 08-22-2019, 04:55 PM   #3 (permalink)
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Maybe loose wire and it’s that RPM that vibrates that wire. Check plug wires, CPS wires, coil wires. Also check under seat all connections including at ECU and ground lug. All must be tight!

I know you said you replaced the LAS but I had a problem once when it was the wires going to the connector going to the LAS. So, try pushing on those wires making sure that they are deeply seated into the socket of the connector making sure each wire individually is deeply seated. Also, could try disabling LAS by carefully disassembling it being very very observant how it is put together especially the pendulum. Then basically stabilize the pendulum with a piece of tape.

What did I miss people he is on a trip and need this resolved ASAP.
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Old 08-22-2019, 05:22 PM   #4 (permalink)
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I suggest that the CPS unit could be the issue....
Especially since u said that try all those other things...

Good luck

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Old 08-22-2019, 05:40 PM   #5 (permalink)
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Quote:
Originally Posted by Desertboy13 View Post
I suggest that the CPS unit could be the issue....
Especially since u said that try all those other things...

Good luck

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This^^^^^


Check the rubber grommet exiting the clutch cover @ the bottom rear of the cover, if the grommet has a white dot on it the CPS has been changed. Follow the wires looking for a splice many techs will change the CPS & simply twist the wires together & tape them. Fix the connection.


If no white dot on the grommet exiting the clutch cover you have an original CPS = change it.


I have several of the CPS in stock they are new & include the clutch cover gasket will sell them for 40.00 ea USD + shipping.
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Old 08-22-2019, 06:03 PM   #6 (permalink)
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I made mistake,I replaced crankshaft position senor,I do not know what is las,could you say full name of this sensor
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Old 08-22-2019, 07:32 PM   #7 (permalink)
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LAS = Lean Angle Sensor
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Old 08-22-2019, 07:34 PM   #8 (permalink)
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LEAN ANGEL SENSOR....
Sometimes mine acts up like yours..

What I do is unplug the LAS
And Spray it with Electrical Aerosol spray
Let dry a few minutes and replug
And ride.

Works on mine..



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Old 08-22-2019, 11:02 PM   #9 (permalink)
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So you replaced the Lean Angle Sensor and the Throttle Position Sensor and the Crank Position Sensor. Still does the same. Yes?
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Old 08-22-2019, 11:31 PM   #10 (permalink)
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Sounds exactly like the lean angle sensor LAS to me. That's exactly how mine presented at a fairly narrow RPM range it would miss momentarily.
As others have said you can try cleaning the contacts on The Wire. I had it happening on a road trip and I was able to just avoid that RPM range and it was okay.
The lean angle sensor is on the left side of the bike in behind the horn down low.


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