Author Topic: Will 1974 CB550 transmission fit 1973 CB500  (Read 2478 times)

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Offline Deltarider

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #25 on: December 13, 2019, 01:31:43 AM »
+1 no it cant.
There is only one guy in the whole SOHC world that claims the 500 doesnt have clutch/trans issues!
[even though Honda engineers totally changed the system after only 3 model years]
No, they didn't, not on the CB500, they did modify however and in Europe CB500s have been succesfully sold up into early 1977.
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Offline dave500

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #26 on: December 13, 2019, 01:44:50 AM »
successfully sold don't mean it wasn't promblematic?,Europe ended up with 500 top ends on 550 bottom ends from the factory,had to use up all the 500 barrels?or was it a road tax thing?either way the 500 transmission wasn't around.

Offline Deltarider

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #27 on: December 13, 2019, 02:58:52 AM »
successfully sold don't mean it wasn't promblematic?,Europe ended up with 500 top ends on 550 bottom ends from the factory,had to use up all the 500 barrels?or was it a road tax thing?either way the 500 transmission wasn't around.
Believe me, the combo 500/550 that Web has acquired, is a rarity. We're not talking the much later K3 models. That's a different story.
All I can contribute to a somewhat balanced overview, is that overhere the CB500 gearbox had a good reputation and was much praised for its smoothness. Personally I have never met or heard of one that had a problem. In both the socalled riders reports* that are in my archives, not one complaint has been filed that concerns the transmission, nor in any of the other articles in French, British, German, Italian and Dutch magazines that are in my collection. Mine has worked for 135.000 kms** flawlessly and still does. Clutch likewise. I can't rule out there have been problems with some early models over where you are.
What always strikes me, is that, in spite of the tens of thousands that have been sold ever since (here up to early 1977!), some will still continue to say: stay away from a CB500 transmission. Why? What knowledge do they have? It demonstrates how the internet works. Just repeat what you think is safe to repeat and you will at least be rewarded with 15 minutes of Andy Warhols fame in the world wide web. But misleading it is, as it is based on hearsay and always comes unquantified. If the issues the early model possibly had, had not been addressed by Honda, the company would not have survived. Having said that, this does not apply to you: you and Bryanj are always to the point and demonstrate first hand knowledge.
* The last one compiled of the experiences by 39 riders over a total of 2.338.462 kms, which equals 6 times around the world!
** In my archives there's also an article about a guy that at the time of the article had done 225.000 kms with just regular maintenance and still used his CB500 as a daily ride.
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"There is enough for everyone's need but not enough for anybody's greed."

Offline dave500

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #28 on: December 13, 2019, 03:18:58 AM »
#$%*en hell?the 500 transmission is somewhat feeble compared to the updated 550 full stop,why would Honda pull all pins and update so much in the same basic platform retaining as much as the basic foundation as Honda could otherwise,man ill break a 500 transmission so easy,they cant hack the real world down under that's for sure!

Offline web

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #29 on: December 13, 2019, 04:03:14 AM »
Europe ended up with 500 top ends on 550 bottom ends from the factory,had to use up all the 500 barrels?
Nah that one linked up here is a homebrew one-off. They even wiped out the casing number partially, to "hide" the fact that it doesn't belong on the bike.
Someone probably did indeed break the 500 transmission on this bike, and proceeded to put his good 500 barrels on a 550 box.

Europe had the CB500 and CB550 sold beside each other for a while, with different transmissions. The 550 was not an outright successor like in the US.

So you could say they had to use up the 500 barrels as well as the transmissions :-) But apparently chose to do that in Europe only.

The CB500 continued to be sold (with small updates) until about 1977. Problematic or not - that I don't know, but last I heard, Deltariders' example was still working 8)

Beside the red bike I also own a late model 500 transmission (i.e. one of the years where it was already discontinued in the US), but I have yet to find out if it still works.

Offline bryanj

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #30 on: December 13, 2019, 05:38:43 AM »
Main reason the 550 bottom end was reworked by Honda was because of the primary chain wearing into the oil gallery on the 500, which didnt show up for qhite a while. The K3 500 was because of a very big insurance cost jump for riders if bike was over 500cc.

As to werher us brits are nutters or not why did Yamaha have to do 3 exhaust mods on the 250/350 lc when it came here? Was OK in rest of world just us lot thrashed them so mercilessly they woyldnt stop leaking at the barrel.

Never mind Seasons Condiments to all and remeber when drinking at patries lean on the wall-----it hurts less when you slide down as against fall over!!!
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline PeWe

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #31 on: December 13, 2019, 07:09:57 AM »
Plenty of knowledge here!

Every time I read about CB500/550 I get the thoughts that CB750 engine is much easier to work on. From totally taken apart to fully restored/ modified.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Deltarider

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #32 on: December 13, 2019, 07:52:11 AM »
Web has been with us for only one and a half month and already now is the champion finding oddities.
Bryanj, the bike in your avatar, what color is it? The one Web owns, looks very close.
Pewe, you're the 750 guy. I know the CB750K3, K4 and K5 were not imported in The Netherlands. Was this the same for all of Europe?
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"There is enough for everyone's need but not enough for anybody's greed."

Offline bryanj

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #33 on: December 13, 2019, 09:50:56 AM »
My bike is/was brown
UK 750 went from K2 direct to K6 i think along with F1 and 2 but no 3
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline PeWe

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #34 on: December 13, 2019, 12:19:35 PM »
K3, K4, K5, K8 and F3 did not go this way.
K2 to 1975 still with K2 style gauges and rhino horn, then K6 followed by K7 1978.
K1 blinkers, rear fender and rear light was the style on all K2 and K6.
All K2 got the small bar on left side only to get bike on center stand.
K6 got the larger version all around rear part of the seat fastened into the upper shock bolts, handy for passenger to grab.

Details important to know before ordering parts from CMSNL that has charts for EU bikes, still US equipped.
« Last Edit: December 13, 2019, 12:22:08 PM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline web

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Re: Will 1974 CB550 transmission fit 1973 CB500
« Reply #35 on: December 14, 2019, 02:25:16 AM »
I've always had a thing for oddballs. Just look at the people I hang out with  ;)