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1982 XJ750R SECA drivetrain noise

Discussion in 'XJ Technical Chat' started by Dwmadsen, Jun 17, 2023.

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  1. Dwmadsen

    Dwmadsen Member

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    Location:
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    1982 750 SECA with 22,000 miles
    The bike is giving a wah wah wah noise during steady state driving (~35-40 mph). It is difficult to accurately pinpoint from where the noise is originating while driving. I can pull in the clutch and the noise continues until speed is probably less than 20 mph; this step would seem to eliminate the noise coming from the engine since the engine speed is reduced to an idle and yet the noise is unabated.
    Ideas?
     
    Dwmadsen, Jun 17, 2023
    #1
  2. Fuller56

    Fuller56 Well-Known Member

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    Speedometer and/speedometer cable, drive gear on the front wheel hub. Easiest is to clean and lube the cable in the sheath. Then retest. There are threads here about cleaning & lubing the speedometer itself also.
     
    Fuller56, Jun 17, 2023
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    k-moe likes this.
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    I agree. Check the final drive oil though. It's not where the noise is coming from, but you probably haven't checked it in a while, just like I haven't.
     
    k-moe, Jun 20, 2023
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  4. Dwmadsen

    Dwmadsen Member

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    Checked the speedometer cable and it was slippery smooth. That said, the noise has been absent this last week. It might be the speedometer itself but I will refrain opening that can of worms until/unless the noise rears its head again.

    The final drive oil level is full. I was wondering if it might be the driveshaft splines and if so, it appears the swing arm has to be removed. I haven’t pulled off the swing arm and am not sure what it entails. I read the service manual and without the parts in front of me, I am sort of lost - maybe with wrench in hand it will start to make sense.
     
    Dwmadsen, Jun 27, 2023
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  5. Jetfixer

    Jetfixer Well-Known Member

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    Remove the insturment cluster by removing two 10mm nuts , unthread the speedometer cable. Remove the four screws from the rear cover, remove the three 10mm nuts and remove the bracket. There are two cheese head screws remove these , unthread the trip odometer . There are six to eight screws holding the bezel on remove them and once bezel is removed carefully remove the speedometer. Once you have it out , do not touch face plate you do not want finger prints on it. Be careful of the needle it can break easy. Use a cotton swab apply a light amount of axle grease to the gears , use wd40 with a nozzle looking down you will see the gimble roller spray a little bit there . The stem where cable attaches , I usually push grease into it. Note you wont have to disconnect any wires and although this sounds complicated it really isn't should only take about 30 minutes. The first time I was out riding my Seca and it was making a noise like JT8 jet engine ( miss working on them) good luck
     
    Jetfixer, Jun 27, 2023
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