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Hi all looking at replacing the breather hoses on a 1979K that are starting to show some signs of perishing-what are people generally using-Im thinking just some oil catch can tubing unless others have a better suggestion. (Im told most "heater hose" isnt oil resistant.). Are people generally...

Any sign of clutch slip? Any brake dragging-you can feel the front disc for heat after a long ride and spin the back wheel after things heat up to temp (again after a ride)

Yup...the later ones differred....but for Usa that year you are right.

Reuse all the oem brass bits if you can...

Keep in mind AFIK those "wire wheels' will only be found on a one year model run (1979)...also the front has a single disc....rear is drum

R6 mod....

Attached overview-there's a link in the pdf that gives you the install guide

The downloads may be slow on phones.

https://www.dotheton.com/index.php?threads/dohc-cb750-honda-factory-manuals.44399/

Ill post a relevant live link.....

Yup racers did a similar sneaky mod in production racing to allow them to grind the covers and keep oil in....

Could think about cam chain and guides...a bit of a weak point...theres a race spec mod you can easily do with the engine open. Starter clutches a weakpoint in the 750/900 dohc...theres a R6 modification you can do.. If interested in the cam chain mod, let me know and ill send you a pdf...

Try Silvers USA. Remember tho oil seals and gaskets that are NOS may have degraded if not stored well and if they haven't been produced for 20 or more years.....

The "Z" tends to be the first/second in the model line....similar to the 1979 CX500(z). Tho' CMSNL lists the USA 1979CB750K as 1979CB750K(Z).... https://www.cmsnl.com/honda-cb750k-750-four-k-1979-z-usa_model496/partslist/?modelguide_modelid=496

Touched on already-carb balance worth checking. So (are you confident) its a "hanging idle or a binding issue??....does it return to normal idle without touching anything (eg. without touching the throttle)

Do SOHC owners think synthetics is still a issue even if its MA/MA2 rated?

Dyna or TriSpark seem well respected

Update-FWIW in other forums (e.g. even V4 Hondas with the issue) seem to indicate "cold" exacerbates the starter clutch issue....(thinking is springs shrink etc)..need to go in have a look.... Running MA2 oil, so thar shouldnt be a factor.

I seem to have occasional starter clutch noise at attempted start.."slip and the scary clack"...only when cold. I would think if it was the rollers/ springs this would be constant (hot or cold) or am I missing something?? 1979 Dohc K model I know of the R6 mod, which might look at down the...

Hey Loxley...I was thinking going the other way...if only you were in OZ...we could negotiate a swap.....:D

Your IR gun probably is set to .95(default) https://www.instrumentchoice.com.au/what-is-emissivity-and-why-is-it-important#:~:text=As%20a%20general%20rule%2C%20most,an%20emissivity%20value%20of%200.95.

You might use a IR gun to determine differences between pots..... To get a accurate temp reading youll need to adjust the gun's emissivity setting on the gun using general available tables...

Solved-free to drain.....

Hi Gents, can someone remind me if the airbox drain at the bottom of the airbox main housing should have a plug or be free to drain......not the "storage tank"(under the battery) drain(plugged).....

And a unusual gearshift if i recall....

Haha...the Cx...watercooled, shaft drive, tubeless tyres...'nd still screw tappets/pushrods with 10000rpm redline😄... Then theres the CB900c...

there's even "pointless ignition"....but tubeless tyres not for this one....

Nice collections...FWIW I remember seeing photos of a (Aust. police) DOHC with spoke wheels and single disc up front; pictured alongside the more common (Aust. police) SOHC in service. (If memory serves either Vic or NSW). Dunno if large numbers got to the road or it was an "evaluation".

They do work...and dogs aside if the ride is a sunny day one no issue. Fitted unis to a CB550 sohc....

True but I always think they are less suited to riding or even parking in the rain... Same applies to pod foam Unis...