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Author Topic: rear sprocket without plate?  (Read 4072 times)

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Offline maliveline

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rear sprocket without plate?
« on: October 12, 2011, 11:37:09 AM »
hey so i replacing my rear sprocket. my old one was just one piece. my new one is the OEM design with a recessed surface for a plate to fit inside and then the nuts secure everything down. well i dont have a stupid plate and this sprocket they sold me didn't come with one which is kinda scandalous if you ask. anyway is it cool if i just put this sprocket on with out the cover plate and just roll around like that?
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Offline vames

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Re: rear sprocket without plate?
« Reply #1 on: October 12, 2011, 11:42:18 AM »
The aftermarket rear sprocket on my 400f doesn't have the plate like the original -- I haven't noticed any problem in the six or so years I've had it on there.
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Offline TwoTired

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Re: rear sprocket without plate?
« Reply #2 on: October 12, 2011, 11:47:11 AM »
If your are talking about  Part # 3 in the diagram...
http://www.cmsnl.com/honda-cb750k2-four-usa_model14362/partslist/F18.html
...I wouldn't run without it.  If you happen to pick up a rock in the chain, the chain can come off the sprocket and jam between wheel and swing arm.  The plate halts this sort of damage/calamity.  But, if you wish to risk such carnage, the bike will work fine until such an event occurs.
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Offline vames

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Re: rear sprocket without plate?
« Reply #3 on: October 12, 2011, 12:11:42 PM »
Interesting -- I realize the OP is talking about a 750, but on the 350F and 400F, the plate was riveted on to the sprocket and the parts sites say it's no longer available. I wonder if it's worth drilling the rivets out, drilling holes in the newer sprocket and riveting it on.
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Offline TwoTired

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Re: rear sprocket without plate?
« Reply #4 on: October 12, 2011, 12:35:41 PM »
If the chain never jumps off the sprocket, or if the damage that occurs when it does isn't a concern, then it isn't needed or worth the effort of putting the plate on.
Kind of the same category as helmets, leathers, and air bags for cars.  Don't need them to get from point A to point B MOST of the time.  And, there are cases where they are never needed in a lifetime.  Still, some owe survival to their use.

One of life's choices... ;D

I happen to find comfort in having that plate there.  Maybe it's because I watched a bike ahead of me (CB450) throw the chain off the sprocket when his shirt got caught in it.  The plate allowed the trip to continue after chopping out the shirt remains and getting the chain back onto the sprocket.  That plate prevented any damage to the machine's wheel, spokes, or swing arm, apart from some marking on the plate edge.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
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Offline Deltarider

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Re: rear sprocket without plate?
« Reply #5 on: October 12, 2011, 12:51:02 PM »
TT is right. I remember I once had a badly attached towel that fell of the luggage carier and consequently was eaten by the rear sprocket. I didn't see it happen ofcourse but it sure was a strange sensation to be slowed down so strongly by what seemed an invisible hand. Never realized until now that the plate possibly prevented the chain to derail.
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Offline vames

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Re: rear sprocket without plate?
« Reply #6 on: October 12, 2011, 12:59:36 PM »
I don't doubt the measure of safety afforded by the plate -- I just wish that the aftermarket sprocket makers would include a plate.
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Offline maliveline

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Re: rear sprocket without plate?
« Reply #7 on: October 12, 2011, 01:04:46 PM »
yes i am talking about part #3. not really sure how i would get my hands on one of these. i think its kinda cheesy that it didn't come with the sprocket.

i dont think i really understand the function of this plate. when you put it in the sprocket does it sit flush with the surface of the sprocket or does it stick out a little? is that what prevents the chain from comming off the sprocket?
« Last Edit: October 12, 2011, 01:09:04 PM by maliveline »
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Offline MCRider

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Re: rear sprocket without plate?
« Reply #8 on: October 12, 2011, 01:15:13 PM »
Lots of people have removed those. If you want one, put a WTB in classifieds. I probably have an extra one for that matter. Without denying the safety element, I think you'd be hard pressed to find any other model that had one besides the 70s era CB Hondas. My 68 CB77 does not, my 78 CB400 does, my 88 HawkGT does not, etc.

DeltaRider and maliveline, the plate doesn't keep the chain from coming off. It holds it up if it does come off allowing the wheel to keep turning. I think.
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Offline TwoTired

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Re: rear sprocket without plate?
« Reply #9 on: October 12, 2011, 01:20:31 PM »
The plate doesn't prevent the chain from coming off or disengaging the sprocket teeth.  However, if the chain does jump off the sprocket, it provides a benign landing area for it, rather than wedging between swing arm and rotating wheel components.

It does stand proud off the side of the sprocket and blocks a falling chain from reaching the axle.

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Lloyd... (SOHC4 #11 Original Mail List)
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Offline maliveline

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Re: rear sprocket without plate?
« Reply #10 on: October 12, 2011, 01:37:44 PM »
oh i see how it works now. well thanks for the info guys i appreciate it.
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Offline cavapal

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Re: rear sprocket without plate?
« Reply #11 on: October 12, 2011, 01:50:27 PM »
I have been driving/owning many drive chain bikes, I had CB 900 and 900 F2, CB 1000 Big one and in my garage there is a CB 1300 (2005)  and a CB 750 (78) this is the only one with that plate.
Looks like a safety device as people said but after that model Honda never used again dont ask me why but I'm sure that they have good reasons to do it.
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Offline flybox1

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Re: rear sprocket without plate?
« Reply #12 on: October 12, 2011, 01:55:33 PM »
Quote from: TwoTired on October 12, 2011, 12:35:41 PM
That plate prevented any damage to the machine's wheel, spokes, or swing arm, apart from some marking on the plate edge.
...and (markings) in said CB450 riders shorts.  :o ;D
the plate in question polished up nicely on my 350F while my bearings were in the freezer  :)
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Offline ofreen

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Re: rear sprocket without plate?
« Reply #13 on: October 12, 2011, 02:00:33 PM »
Quote from: maliveline on October 12, 2011, 11:37:09 AM
anyway is it cool if i just put this sprocket on with out the cover plate and just roll around like that?

The answer to the question is yes, it is cool.  And not particularly risky with a chain in good condition kept properly adjusted.  As others have pointed out, those plates are a relic of a bygone era.  (just like our bikes. ;D)
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Offline andy750

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Re: rear sprocket without plate?
« Reply #14 on: October 12, 2011, 02:20:01 PM »
Just dont do as I did once upon a time and have a link taken out of a stretched o-ring chain to get me home from a long trip....said chain came apart on the highway some 90 miles later and the thing that saved me was the #3 part....Ill continue to use it just in case...
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Offline bjatwood

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Re: rear sprocket without plate?
« Reply #15 on: October 13, 2011, 07:55:21 AM »
Mine doesn't have one of the covers either. Been running it all summer with a chain adjustment every 200 fricken miles cause it is stretched out. Now that my riding season is over New sprockets, x-chain, Spokes, brakes and probably a new rim too. Lots to "play" with in the off season.
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Offline Lostboy Steve

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Re: rear sprocket without plate?
« Reply #16 on: October 13, 2011, 08:13:08 AM »
I left mine on but I had it powder-coated to match he hub as well as the sprocket. It actually looks kinda cool like that.
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Offline MCRider

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Re: rear sprocket without plate?
« Reply #17 on: October 13, 2011, 08:44:50 AM »
Quote from: twistedengineering on October 13, 2011, 08:13:08 AM
I left mine on but I had it powder-coated to match he hub as well as the sprocket. It actually looks kinda cool like that.
Me too. I'd run without for a hundred years. But I wanted some color in the rear and didn't want to color the sprocket itself. So I powdered the guard to match the frame.
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Offline Really?

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rear sprocket without plate?
« Reply #18 on: October 13, 2011, 10:55:25 AM »
Ty for the info folks!
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Hinomaru

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Re: rear sprocket without plate?
« Reply #19 on: October 13, 2011, 11:26:21 AM »
Chrome sprocket sheilds also look nice and cost around $20 or so for the spinning "Bling" factor. Too bad Honda didn't do this to match the rest of the chrome parts on thier bikes.   

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Offline steam-powered man

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Re: rear sprocket without plate?
« Reply #20 on: October 13, 2011, 11:41:22 AM »
i have one of those plates if you want it, for free.  just cover my shipping costs.  $8.
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Offline Lostboy Steve

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Re: rear sprocket without plate?
« Reply #21 on: October 13, 2011, 02:06:41 PM »
Quote from: MCRider on October 13, 2011, 08:44:50 AM
Quote from: twistedengineering on October 13, 2011, 08:13:08 AM
I left mine on but I had it powder-coated to match he hub as well as the sprocket. It actually looks kinda cool like that.
Me too. I'd run without for a hundred years. But I wanted some color in the rear and didn't want to color the sprocket itself. So I powdered the guard to match the frame.


DUDE I AM LOVING THAT COLOR! lol My friends think I'm crazy because I kept the original tank paint (brownish black with orange and gold stripe) and I'm doing gold and orange accents all throughout the bike.
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Offline burnoutking1971

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Re: rear sprocket without plate?
« Reply #22 on: October 13, 2011, 02:58:19 PM »
Well done, I like the chrome swing arm and the contrast between the frame color. What kind of tires are you running? I like the tread pattern.
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Offline MCRider

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Re: rear sprocket without plate?
« Reply #23 on: October 13, 2011, 05:00:57 PM »
Thanks Twisted and Burnout. The color is a metallic silver with gold candy powder. Looks different in better light.

The tire is an IRC Roadwinner: 140/70-17

Price was right, really don't know how it will work. Holds air OK though.  :D
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Offline Retro Rocket

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Re: rear sprocket without plate?
« Reply #24 on: October 13, 2011, 05:14:25 PM »
Quote from: cavapal on October 12, 2011, 01:50:27 PM
I have been driving/owning many drive chain bikes, I had CB 900 and 900 F2, CB 1000 Big one and in my garage there is a CB 1300 (2005)  and a CB 750 (78) this is the only one with that plate.
Looks like a safety device as people said but after that model Honda never used again dont ask me why but I'm sure that they have good reasons to do it.

Probably because the early 750 Honda's had chain break problems early on, more to do with bad quality of the early chains than anything else.
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