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WARNING front sprocket nuts tend to loosen
http://www.kawi2strokes.com/forum/viewtopic.php?f=14&t=4355
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Author:  Ric [ Wed May 21, 2014 7:05 am ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

Happened to me on my 71 H1. Cleaned thoroughly and used red Loctite - no more problem.

Author:  BBP [ Wed Sep 03, 2014 7:36 pm ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

The lock washer I got from Diablo was way too thin, sheared the tab off as I was tightening down.......went back to my old.......have one coming from France at this time, don't know if it will be any better........does anybody sell thick good ones ?

I am using PBI sprockets with 520 chain and a Yamaha spacer with bolts in it, had to grind a hole in the sprocket, loctite and no problem in 1100 miles.......I can see where an event happened before as a part of the case was craked by the sprocket, cleaned it up with a dremel

THX Phil

Author:  Stev-o [ Sat Aug 05, 2017 7:01 pm ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

Ja-Moo wrote:
Counter shaft sprocket nuts tend to loosen and come off. Usually they just fall in the cover, but can cause a dangerous situation.

Four reasons (I know of) for the problem:


3. Improper prep or lack of torque on the nut. The nut and threads should be in good shape, and thoroughly cleaned of all oil or grease, then blue loctite applied. Torque should be from 70 to 80 ft/lbs. DO NOT use an impact to install the nut. And of course one of the locking washers side bent up to hold the nut.



Installing the front sprocket on my H2B and scratching my head. I've bought a new sprocket, has the little hole, and a new washer as shown on the fiche.

http://3cyl.com/mraxl/microf-h2/B8-fix.jpg

What locking washer??

Thanks

Author:  III [ Sat Aug 05, 2017 7:17 pm ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

"What locking washer??"


Referring to the washer that has a tab that sits in the hole in the sprocket.

92024-067 I believe is the part number.

Author:  Stev-o [ Sat Aug 05, 2017 9:07 pm ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

III wrote:
"What locking washer??"


Referring to the washer that has a tab that sits in the hole in the sprocket.

92024-067 I believe is the part number.


Oh, that one is to be bent up on the nut? Got it, thanks.

Author:  Franjo [ Thu Jun 28, 2018 6:31 am ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

Hi there!

On race bikes we always secured the sprocket with 0.032"safety wire.
Installing a new chain and sprockets to my H1 I bored two holes in the sprocket and one through the flanges of the nut.
This should fix that problem:

Attachment:
Ritzelsicherung_640.jpg


With kind regards from Germany
Franjo

Author:  H2RTuner [ Thu Jun 28, 2018 8:46 am ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

On the factory H1R and H2R front sprockets we had, they were drilled through, 6 to 8 holes. We called them "holey sprockets". And used both the stock lock down plate and two safety wire lines, through the holes, to two holes in the wrench flats of the sprocket nuts. The nuts still loosened up, even in the shortest length races.

Author:  Mgmark [ Sun Jan 27, 2019 1:32 am ]
Post subject:  Re: WARNING front sprocket nuts tend to loosen

This explains why I needed an air impact to get the sprocket nut off! I’ve never seen one so tight on a bike before but this explains it. I ordered a nos lock tab and reinstalled per your directions.

Mark

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