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#1 |
Join Date: Aug 2023
Posts: 3
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Starter One Way Drive Clutch
Here are pictures of the main pieces of my starter one way clutch.
What I am not figuring out, is the rivets that are on there, are they holding the drive clutch on since I have removed the 3 bolts that are supposed to hold it on? If that is the case, then do I have to drill out the rivets to replace the one way drive clutch? I found the replacement part, one of these 2: https://www.vmcchineseparts.com/coll...ycle-version-5 https://www.vmcchineseparts.com/coll...ooth-version-4 Shouldn't the one way clutch come off of the magneto just by removing the 3 bolts that are "holding it on"? This is the final piece of this machine that could potentially get it running. Any help would be greatly appreciated! Thanks in advance! |
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#2 |
Join Date: Mar 2021
Location: Boston
Posts: 19
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I have never seen that type of one way clutch, but the one's I have seen you just unbolt it from the flywheel and it falls right off. The one's on the VMC website have no rivets, so I have a feeling it may be one of more of the sprags keeping it on. Maybe try putting the flywheel in a vice and turning the one way clutch the opposite direction of the arrow etched on there.
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#3 | |
Join Date: Aug 2023
Posts: 3
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Quote:
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#4 |
Join Date: Aug 2020
Location: Australia
Posts: 1,378
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Yep that's the starter sprag clutch.
can be found much cheaper. https://www.aliexpress.com/item/32888337993.html https://www.ebay.com/itm/113744564870 |
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#5 | |
Join Date: Aug 2023
Posts: 3
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Quote:
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#6 |
Join Date: Aug 2020
Location: Australia
Posts: 1,378
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is it off the crank?
the sprag clutch allows the flywheel to free spin unattached to the starter transfer gear when the engine runs...but binds onto it when cranking. It could be possible the 1 way sprag bearings have binded onto the flywheel if the part has failed... the sprag attaches to the back of the flywheel with the 3 allen head bolts. The cranking gear goes on the crank first independent of the sprag/flywheel then the sprag inner clutch rides over the cranking gear boss... Also it can be difficult to remove and install the crank timing key when the sprag and flywheel are combined prior to install...So be mindful of the timing woodruff key The sprag might have formed a rust bond on the flywheel but other than the 3 allen bolts all there is might be a mild friction fit that could be coaxed off with a plastic/wood mallet. |
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#7 |
Join Date: Oct 2023
Location: Pocono Mountains, PA
Posts: 1
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#8 |
Join Date: Jun 2018
Location: Wiggins, MS
Posts: 45
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Sounds like soft bolts, I’d try something hardened.
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#9 |
Join Date: Feb 2009
Location: Michigan
Posts: 1,040
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Thread the bolts back in but only half way. While holding the flywheel, start tapping the bolt heads with a hammer in a circle pattern. The parts are machined pretty well but they'll come loose.
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#10 | |
Join Date: Jul 2019
Location: Lancaster,Ky
Posts: 467
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Quote:
Put the 3 socket head bolts back in but don't screw them all the way down and tap on the heads lightly with a hammer maybe.I didn't see somebody had already put this out there. |
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#11 |
Join Date: Jul 2019
Location: Lancaster,Ky
Posts: 467
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Just like what I went thru with my Linhai 300 atv.
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