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TOPIC: Rear cog washers/keepers

Rear cog washers/keepers 06 Jun 2019 13:22 #1

  • meadeam
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How important is it to use these? I assume they are to prevent the bolts from backing out. Do you all use them everytime? Mine are pretty banged up after being taken off a few times in this bike's 45 years. I'd just leave them off and perhaps use a bit of locktite unless somebody tells me that would result in certain bodily injury or death.

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1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY

Rear cog washers/keepers 06 Jun 2019 13:58 #2

  • RT325
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Good loctite threadlocker will be ok, just don't forget to put it on in the exitement of getting it going/ Use high tensile bolts full length of the threaded hole etc. I see all the bolts out of my old honda car motor are super high 10 strength & pull up nice & solid. I remember at work years ago the supplier of out nits & bolts supplied a bunch of low tensile bolts & was a damn nightmare until we realised what was going on. Just useless cheesy bolts. That reminds me--are nuts of a tensile strength as well as bolts, maybe so but i've never thought that one out. Standard bolts seem to be 8.8 down here in any hardware store,

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Rear cog washers/keepers 06 Jun 2019 14:43 #3

  • Pillsbury
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This may be overkill but I replace them with studs, loctite the studs in and then safety wire the nuts :unsure:
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1970 DT1-C Grand Prix race bike
1970 DT1-C Street tracker
1968 Honda CL90
1971 Honda Sl 125
1973 Honda CR250
1974 Honda MR-50
1966 Triumph Tiger Cub
1967 Moto Guzzi V700
1970 Suzuki TC90
1947 Mustang

Rear cog washers/keepers 06 Jun 2019 17:20 #4

  • MarkT
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Ummm.... talk to GFrench about Loctite and not using the lock plates on the rear sprocket. (Safety wire would be fine)

Probably in a thread here someplace... spoiler: sprocket came loose, loctite did not hold.

Motodad24 on ebay has repop sprocket lock plates for most bikes at a good price... good guy... met him at a Meis event a few years ago.
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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Rear cog washers/keepers 06 Jun 2019 17:34 #5

  • MarkT
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It's been a long day... maybe it wasn't GFrench that had the sprocket bolts back out even with loctite... I do know it's happened to others...

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Rear cog washers/keepers 09 Jun 2019 16:35 #6

  • meadeam
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I ended up reusing them. They weren’t as rough as I thought. I’ll replace them next time I take them off for any reason.
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1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY

Rear cog washers/keepers 09 Jun 2019 20:12 #7

  • GFrench
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MarkT wrote: It's been a long day... maybe it wasn't GFrench that had the sprocket bolts back out even with loctite... I do know it's happened to others...



For me.... NEVER Never never run your bike without the washer lock plates or your right Mark- bad things can and will happen.

I tried once not running them and the results could have been very bad... with so much torque and constant applied pressure to the sprocket it takes a lot more than loctite to secure the bolts.

Not going to be a good day if bolts back out and they catch the swing arm and start shearing things off!

Yamaha had a design/ reason for them.

Our friend MotoDad has the best deal going on them/Ebay-



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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

Last Edit: by GFrench.
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