" Sprag" (AKA "Starter Drive Clutch") replacement | Victory Motorcycles: Motorcycle Forums

" Sprag" (AKA "Starter Drive Clutch") replacement

Discussion in 'Tech Q&A' started by RoteBarron, Jul 21, 2019.

  1. RoteBarron

    RoteBarron Active Member

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    Well, I was finally able to change out my Vision's starter sprag gear. A big shout out to Noe Martinez and others that pointed out the issue. Sadly (Eric the) Red had never been out in really, really cold frickin' weather to try to start. What happened is we moved from the south (N. Alabama) to SE Wyoming.....in February....Red (with little fanfare) started easily while in the trailer (the horror, the horror) but had to be shut down to unload and when it was time to put it in the garage upon the restart attempt it didn’t, I hesitated on the starter switch and it made that funny (now sickening ;-) ) little “clink” sound and the starter just spun. *&$^#% “sprag” gear broke. I thought I read about it in passing but some people just gotta learn the hard way…....At any rate the job is probably about 2 hrs....IF you have ALL the tools (and can find them). I laid Red on the right side and pulled the shifter/floorboard assembly, the clutch Cable (Carefully rotate the pinion shaft with an adjustable spanner (AKA “crescent wrench) clockwise, and then removed the cap plate, pulled the clutch pinion (not sure that was necessary but…..) and then pulled the primary cover off. The primary cover came off OK (more later). I then removed the center bolt on the flywheel in the process learning that keeping the crank from turning (without the 2 zillion dollar tool (2ZDT)) proved challenging. A plastic handled scraper (PHS) sacrificed it's end piece and when placed the same as the 2ZDT (in the service manual) the PHS served well. I pulled off the flywheel with the special tool (as noted by several people thank you) a drain plug from (an) 85 model Subaru (Who knew ;-) It really works too....) with little fanfare. I then removed the Crankshaft Gear (Primary Drive Gear) behind it and then removed the Starter Drive Clutch (sprag) gear. Oddly enough the sprag “looked” perfectly fine Then again, I’m not certain what “broke/good” should look like). I reinstalled the sprag gear, the Crankshaft Gear (Primary Drive Gear) and then reinserted the flywheel. Then I realized while I had a swell ½in. drive torque wrench I did not have a frickin’ 15MM ½ drive socket (no matter how many times I looked in the toolbox). Off to the parts store (thus the extended repair time) for a new metric socket set (an’t have too many and hey, I got another 10mm to loose…) Got it torqued to 75ft lbs and then began the rest of the reassembly. There is an important thing remember here....Not previously mentioned though obvious…. the primary cover has a million (zillion?) power magnet in it (Capable of lifting steel girders?) that will try very hard to eat your fingers off when trying to reinstall. I have no idea how to avoid it. After getting it back on with most of the skin on my fingers intact I reinstalled all the other stuff and gave it a try. Hallelujah Red lives. Ultimately I wanted to write all this to lay it out and to show a picture of a spag gear - broken no less....as I hadn’t even seen one so here it is.
     

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  2. Bueller

    Bueller Active Member

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    Thanks, sounds like this needs done with a new clutch. Maybe a time saver.
     
  3. recumbentbob

    recumbentbob Well-Known Member

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    Thanks great write up.
     
  4. primethious

    primethious Well-Known Member

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    One of the best tips about primary covers I saw on here a few years back was to use some threaded rod in a few of the the primary bolt holes, then slide on the gasket, then the primary cover making sure the wires didn't get caught and no finger pinching. then remove the threaded rods and install the primary cover bolts.

    Great write up!
    I have to do this eventually as mine howls terribly at certain rpms so this one is bookmarked!
     
  5. primethious

    primethious Well-Known Member

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    Quick question...No left handed threads right?
     
  6. RoteBarron

    RoteBarron Active Member

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    Had to think about it because I've been working on "other stuff" but no. No left hand threads. Pretty straight forward....given tools are all on hand. etc...... One reads the good stuff about making guides then forgets it because "it ain't gonna happen to me" until it does. ;-). LMYR
     
  7. primethious

    primethious Well-Known Member

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    Thanks...just ordered the oil plug flywheel remover.
    One day when I die half my "custom" tools will be thrown out as they won't have a clue what they are for. ;)
     
  8. NOEMTZ

    NOEMTZ Well-Known Member

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    Glad you got her back on the road.
     
  9. wvrider1

    wvrider1 Well-Known Member

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    Sprags are used in many automatic transmissions. There 3 types of mechanical holding devices used in transmissions. Of the the 3, a sprag will stand up to higher RPM's. That one there REALLY looks like the one used in a Chevy 1/2 ton O/D trans. Next time I get one that's bad I'll post a pic. Show you one that's really fuched up
     
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  10. wvrider1

    wvrider1 Well-Known Member

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    Here is a pic for a 4L60E input sprag. Inside the driven race you can see the input splines.
     

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