1981 CB750 Super Sport

[Johnnylevi]

https://www.google.com/search?q=when+were+speedometers+limited+to+80&ie=UTF-8&oe=UTF-8&hl=en&client=safari#itp=open1

There's an article. Yours must have been made pre september 1 1979

[Johnnylevi]

So, i know these engines are supposed to be a bit noisy from the clutch rattle, but how noisy should they be? Mines sort of concerning me. I've never had it running this long before though

[seestheday]

Where is the noise coming from?

Could be a loose cam chain (potentially bad), clutch rattle, unsecured exhaust, carbs that aren't sync'd....

Mine purrs like a kitten at the 1,000 rpm idle after my rebuild. Zero rattles, just engine noise. 

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From: Johnnylevi [via Honda CB750'S]

Sent: Tuesday, April 30, 2013 7:00 PM

To: seestheday

Subject: Re: 1981 CB750 Super Sport

So, i know these engines are supposed to be a bit noisy from the clutch rattle, but how noisy should they be? Mines sort of concerning me. I've never had it running this long before though

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NAML

[shinyribs]

Does the rattle lessen or go away when you pull the clutch lever in? If it is,then it's clutch rattle. You kinda have to really listen for the difference. Once you hear the difference you'll be able to spot it easily later. It takes a moment or two for the noise to change,and even then it just changes,it doesn't go away completely. That is, if clutch rattle is even what you're hearing.

[Johnnylevi]

Yup the noise doesn't go away but changes when I pull in the clutch. I already adjusted the cam chains and synced the carbs so it shouldn't be that. Guess I'll just have to get used to it! Thanks guys!

[seestheday]

You could order that clutch basket kit from that guy in Holland. It apparently fixes clutch rattle  and he seems to have a good reputation on the 1100f site.

He posted a link about it here in the buy and sell section. I am not endorsing it as I haven't tried it, just passing on info. My clutch is quiet so I don't have a need.

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From: Johnnylevi [via Honda CB750'S]

Sent: Tuesday, April 30, 2013 7:54 PM

To: seestheday

Subject: Re: 1981 CB750 Super Sport

Yup the noise doesn't go away but changes when I pull in the clutch. I already adjusted the cam chains and synced the carbs so it shouldn't be that. Guess I'll just have to get used to it! Thanks guys!

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NAML

[Johnnylevi]

Thanks sees. If I end up getting it ill let you guys know how it goes! What makes the clutch rattle anyways?

[Johnnylevi]

So my bike idles fine at around 1000 rpm, but when I go to give it some gas just recently its been bogging out and dying. Could it be partly my battery? Its fine once it gets into the 13-1500 rpm range, but at the lower it doesnt want to give me much kick. JUST started happening after i synced the carbs.

[LukeM]

The rattle has to do with the clutch disks moving slightly inside the clutch basket. Look around YouTube for "cb750 clutch rattle" and you might find some appropriate videos to check out.

Stuff gets worn, tolerances increase, and stuff starts bumping/banging against other stuff. When you pull in the clutch, you disengage the basket from the crank, and things get quieter.

As long as the clutch seems to be working OK, you can learn to ignore it, or you can get that kit from our other user and pop it in.  Looks like a pretty easy mod.

Luke M

[seestheday]

Here is a link to the post: http://honda-cb750-s.456789.n3.nabble.com/For-Sale-Clutch-basket-modification-set-dohc-bikes-td4039506.html

I guess you can live with the noise, or spend $90 to get rid of it.

[Johnnylevi]

Picked up a full hondaline fairing today... does anyone know how to put this thing on??? I have some instructions, but the wiring is funky... I even got an 82 wiring loom with the deal and it doesnt have the right connectors on it... Anyone know?

[Johnnylevi]

just kidding...totally found it. Gonna make another one for my friend though. Getting the connectors from here http://www.easternbeaver.com/Main/Elec__Products/Connectors/connectors.html

[Johnnylevi]

Little late night photo shoot with the motorcycle  Almost there

Just for you shiny! The infamous blue stripe

[shinyribs]

Stripes!!!!Stripes always look good. Single,double...whatever,it just looks cool. Bike's looking good man! My DHOC Super Sport envy just got a little worse.

[Johnnylevi]

If anyone noticed i have a oil pan underneath the left side of my engine... thats because i have an oil leak from the timing cover. I got some gaskets that had honda logos on the outside of the bag, but they are just ever so slightly too small... does anyone have experience with these gaskets and can direct me to a good site? or maybe theres a trick to getting it in?

[Johnnylevi]

And if anyone could help me out here... My rear turn signals dont work... only the rear. the front work fine. I replaced the turn signal solenoid thingy with an electric one because the rear stopped working... Dunno what could be wrong really. AND! my brake light dims when i pull the front brake and does nothing when i press on the rear brake... My bikes butt is messed up  haha

[cdaiscool]

For the turn signals, are the bulbs any good? Check wiring with a test light to verify it's all good as well.

For the timing gasket, no idea. I bought one that said Honda on the bag from a dealer, and it worked with no issue. Sorry!

[Beekeeper]

there are 2 bullet connectors under the seat bracket for the turn signals.  Mine actually route right under tail light mounting bracket.  Not sure how I've done it, but twice when I've had the seat off and on, I've managed to pull them apart.  

[Johnnylevi]

They're definitely connected. Thats the weird part. I'm just not getting any voltage from them. I used a voltmeter to check and nothing... got something from the tail light, but that still doesn't really help... Is it a wiring thing? did something get disconnected somewhere else? its only the rear that dont work.

[Beekeeper]

I was sure it would be those connectors.  Looks like your going to have to head upstream until you find the dead spot.