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Thread: Motion Pro throttle cable

  1. #1
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    Default Motion Pro throttle cable

    Long time no post, good to be back.

    So it has been over a season since Iíve had the bike running. Last year I started it up, dropped the choke and when I twisted the throttle the pull cable broke. And this year I have had too many big building projects to fix it and ride. But today is the day I decided to blow the dust off of my new (year old) throttle cable and install it. Disassembly was easy, the old cable had snapped, rusted about 4 inches from the top. Once the new cable was in I could not get the twisted open throttle to return to closed position. Twisting open was tighter than I remembered also. After a few adjustments on the lower push and pull cables I found I could almost make it work, but never once the housing assembly was screwed back together. Plenty of lube was involved with some head scratching and some mild swearing. It appeared that everything was in place, but something was binding, like I had over torqued the fasteners. I finally noticed that the new cable stay/anchor (or whatever the little lead barrel is called) projected from the plastic rotor it attaches to maybe a 32nd or 16th of an inch or so... hard to tell. So I took it apart again and it was wider than the original. I filed town both sides of the cable stay and reassembled it. It finally worked flawlessly. I would complain, but it was good to wrench on the bike again.
    1979 GS850 Work in progress, Sonic Springs
    1979 GS850 Traded for Stereo many years ago
    1976 Honda 750 four, traded for 850
    1972 Suzuki TS50 (what were my parents thinking?)

  2. #2
    850 Combat's Avatar
    850 Combat is offline Forum Guru Past Site Supporter
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    Default

    The stock push pull throttle on my '78 1000E has a bit of stickiness to it. I have a new Motion Pro to put on it. More than likely, a good lube is all the original one needs. It has chrome steel ends at the twist grip, and they still look fine. The Motion Pro has black plastic ones. They really won't make the machine look materially different. For a clutch cable, the OEM cable compresses less in use, and works better than aftermarket.
    Too old, too many bikes, too many cars, too many things


  3. #3
    bwringer's Avatar
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    Default

    Another example of why OEM clutch, throttle, tach, and speedo cables are the only way to go. (Same for clutch and brake levers, too.)

    OEM cables and levers are not even that much more expensive and in some cases are cheaper than the low-rent imitation crap MP pushes out.

    Parts Unlimited cables and levers are to be avoided as well.
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  4. #4
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    salty_monk is offline Forum LongTimer GSResource Superstar
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    Default

    Does anyone have a measure of the amount of cable pull for the CV carbs?

    I'm having the same issue with what I believe is a stock cable. Weird because I believe the cable has worked on the same bike before!

    I measured the amount of free cable (inner sticking out of the outer) at 47mm. I have one from the older carbs which I can measure... but maybe also a GS750ES which was also a CV carb. I'm wondering with mine if maybe the throttle tube is not stock but then again that was on the bike too...

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  5. #5
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    Default

    Quote Originally Posted by bwringer View Post
    Another example of why OEM clutch, throttle, tach, and speedo cables are the only way to go. (Same for clutch and brake levers, too.)

    OEM cables and levers are not even that much more expensive and in some cases are cheaper than the low-rent imitation crap MP pushes out.

    Parts Unlimited cables and levers are to be avoided as well.
    MP cables can be bad, hit and miss. I have seen them fail almost right away on friends moto bikes. I wish I did not have one on my throttle, but the guys at APE said I need a push pull cable for the RS 's. At least I got a new OEM one on the clutch. I do have some MP tools and really like them. Most aftermarket levers are crap but I did find some really nice folding cnc levers on flea bay. The price was really good and they are more comfortable than stock. They also look cool. I think the seller was topmoto and fitment was 06 sv650 s. Clutch side fits but don't know about brake because I am using sv master. I also put a set on my gixer about 4 years ago. Really nice quality for 25 usd a pair.
    Last edited by chris; 09-25-2020 at 03:24 PM.
    1983 gs1100ed restro-mod. 1998 gsxr 1100 almost mint, 2019 kawasaki klx250, 2011 Beta 250 evo trials bike, 2017 Montesa 300rr trials bike, 2021 honda crf250rx woods weapon

  6. #6
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    Default

    Quote Originally Posted by salty_monk View Post
    Does anyone have a measure of the amount of cable pull for the CV carbs?

    I'm having the same issue with what I believe is a stock cable. Weird because I believe the cable has worked on the same bike before!

    I measured the amount of free cable (inner sticking out of the outer) at 47mm. I have one from the older carbs which I can measure... but maybe also a GS750ES which was also a CV carb. I'm wondering with mine if maybe the throttle tube is not stock but then again that was on the bike too...
    Do you have the cable nipple in the correct hole in the throttle twist grip mine has two positions?
    The big guy up there rides a Suzuki (this I know)
    1981 gs850gx

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