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Topics - Erny

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1
Desperately Seeking!! / CB750K7 main stand
« on: March 18, 2023, 09:28:28 PM »
Looking for CB750K7 main stand in good condition (must not be bended)
https://www.cmsnl.com/honda-cb750k7-four-1977-usa_model495/stand-main_50500405000/

Thanks for offers

2
CB500/550 / Koni shocks - rebuild info
« on: September 25, 2022, 08:28:48 PM »
Bought set of these length exactly as OEM on my 550K1.

Before installing them, I'd like to perform detailed cleaning and thinking if it is worth to rebuild them. But don't have any info about even do not know exact type.
Also thinking to send spring for chroming..

Any advices, addtional info?


3
Desperately Seeking!! / Wanted nice ND tach for my 550K1
« on: August 07, 2022, 11:27:33 PM »
Looking for nice, original, 100% working tacho (RPM meter) for my 550K1, green colour, brand ND - like one on attached photo (these are my gauges).
My tacho is "hanging", means when I close trottle, it takes quite some time hand lowers down... Also on opposite, when revving up, there is delay till hand react and raises up, so looking for replacement original.

4
Member 4 Sales / 750 K7 pipes
« on: April 19, 2022, 12:18:06 PM »
To repair bike after crash, I'm looking for good pipes for my K7 (HM405), as minimum I need upper left and highly likely also lower left one. Alternatively complete set. Let me know please if you have some.

Alternatively, 4into1 or 4into2 pipes for good price can be temporary option too till I find good OEM K7 pipes

5
CB500/550 / Carburettor wrench tool
« on: March 11, 2022, 09:54:23 PM »
I'm considering to make this tool, as I'm quite bothered using normal 8mm socket and screwdriver for carb sync. Each time I tighten nut it moves screw a bit and sync is not accurate...

Found this original Honda tool, want to make something similar https://www.cmsnl.com/products/wrench-carburetor_079083230200/

If somebody has it, can you pls measure key dimensions for me?
Dimensions I'm looking for see attached picture

6
CB500/550 / Aiboxes and airfilters for CB500/550
« on: February 24, 2022, 11:33:15 PM »
Hi all,

I have CB550K1 (type 374) import from US that has rather specific (in Europe) airbox and also air filter. Part diagram for my CB550K1 US model : https://www.cmsnl.com/honda-cb550-k1-four-1975-usa_model466/partslist/F++05.html#.YhgS0eiZOMo

It is difficult and expensive too to get new filter. Genuine very hard to find (and expensive) and alternative/repro too. CMS does not have them anymore.

So, I start to consider changing whole airbox to other type (European?) that will solve this problem...

Does anybody have good overview what is the "best" option to look at? I mean what airbox(airbox housing)/filter I should be serching for?

Thanks for your ideas

7
CB500/550 / Rear wheel bearings installation order CB550K1
« on: February 15, 2022, 09:23:51 PM »
Just online from garage: I'm in front of rear wheel assembly and wondering what side first? Logically I would first install right one (brake side), until fully seated. Then from opposite side long spacer, short spacer and left bearing until it touches spacers. Then tightening retainer while checking for free rotation of bearings?

Please correct if wrong

PS: normally I would not ask and do as above, just seen some posts on US forum instructing other way?

8
Member 4 Sales / 500/550 Rear Hub D ring 79mm x 2.6mm (91261-323-000)
« on: February 14, 2022, 08:27:44 AM »
Just have (finally!) my rear hub apart to replace dumper rubbers.
Will also replace bearings (left one has damaged seal), but windering where to get specific D ring that goes between hub body and flange. My old one has 1.85mm instead of 2.6.

Original seems it is nowhere available, just found some aftermarket but it is O ring, not D ring.

How do you manage that on your builds? Not sure if O ring instead of D ring will seal (groove for D ring seems to be wider than for O ring)

D ring is item #50

9
CB500/550 / CB550 - full trottle performance
« on: May 26, 2021, 12:10:10 AM »
After I finished assembly of my CB550 back to life (http://www.sohc.co.uk/index.php/topic,23823.msg234963.html#msg234963) I did test of newly set carbs and observed following:
When accelerating using full trottle, bike accelerates but slower than I would expect (roar noise is increased of course), almost having feeling that opening full trottle is somehow "braking" engine revving fast. But closing trottle a bit (maybe 1/8 or 1/4) significanly increasing acceleration speed.
Based on my understanding how these carbs works, in such full trottle opening only main jet is in chanrge of A/F ratio, thus logically I would assume mixture is lean so I should replace main jets by bigger ones? I did not do plug test (yet) waiting for good weather occation...

Current bike and carb setup:
- bike is practically 100% stock, air filter element is aftermarket from cmsnl, replaced as new 2 years ago (up to 3.5k miles on it)
- carbs are 022A type, 38/100 jets, genuine Keihin.
- carbs are clean, setup according to HSM, otherwise than high spped (full trottle) running very smooth

Strange is that I did not observe this behaviour, maybe I just did not realise or this is "new" issue.

Any ideas?
If conclusion is to test bigger jets, how big then? 105? 110?

Note: normally I would expect changing main jets on otherwise stock setup will not bring any improvement and all works as it shoud

10
CB500/550 / Muffler connect rubber insert - alternative?
« on: March 31, 2021, 09:08:29 PM »
Just found that inserts in rubber connecting muffler ends on CB500/550K are broken into pieces. Rubbers are still good.
Honda sells it as kits (rubber+insert) - did anyone find good alternative to OEM inserts?

Looks to me kind of plastic or asbestos ring?

Maybe thick gasket material would do the job?

Any advice welcome

11
CB500/550 / Part identification (is it from Honda CB?)
« on: March 14, 2021, 01:03:20 PM »
Found this on the floor in my garage when doing cleaning. Seems I'm getting older as my brain cannot retrieve it from memory, just recall I had it in my hands some time ago

Do you know if this part is from Honda CB? (550K1 or 750K7).
It can also be from Skoda car (carb)...

12
CB500/550 / CB500K-550K-550F cyl. head compatibility and identification
« on: February 20, 2021, 11:00:53 AM »
Went through parts catalogues (CMS), just want to have it confirmed from experts here
I understood, there were 2 PN - 12200-323-010 and later 12200-374-000. Seems there were also 2 types of EX valve guides in production.

- are cylinder heads compatible across all CB500K - 500K - 550F?
- how to identify what head is what PN? Is there some "marking" on head casting allowing that?


Why these questions - I'm preparing for engine rebuild, have possibility to buy set head+cam+valve cover (new type) for good price, but seller is unable to confirm exact head type. Idea is to rebuild that head and swap it on my engine as whole (saving some time) and keep my head as spare for future.


13
Misc / Open / The Highest Motorcycle Museum burned out 😢
« on: January 19, 2021, 11:37:09 PM »
Maybe you catch his sad news - The Highest Motorcycle Museum (2175m above sea level, located in Tirol, on border Italy/Austria) unfortunately burned in fire.

https://www.autoblog.com/2021/01/19/austria-alps-motorcycle-museum-fire/?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS8&guce_referrer_sig=AQAAALUCb0SXx7_guZ_rBvleVXSpsx_2LevJdsA3F5NlznXmXAlk9xbT14DZDsvqhBh0hjtkh6Zzx1lih0E8O36LrzR8bgDcHDWrGKiLfhEMs-k-GOO8ZSXuPZVp7BS0lkc21Bg_E2E5ctO2u7hhTYvFRr5z5pWAiQKkUvkWCRON5apA

There was amazing collection of bikes (more than 230, more than 100 brands.. and even some vintage cars). Never been there but was on my list to visit. :'(

Just look on their website - it was beautiful museum on beautiful place! https://www.crosspoint.tirol/en-museum

14
CB500/550 / CB550K - engine rebuild (partial or full)
« on: October 18, 2020, 09:25:22 PM »
Hello all,

Preparing for engine opening and partial or full rebuild. As I’ll do it for the first time, I’d like to kindly ask for forum experts’ advices/recommendations. I’ll keep thread updated as I’ll proceed. Sorry for long post in advance 😉

Bike is stock CB550K K1, has 17.7k miles total. Engine pulls good as far as I can judge (till 70 mph good, above it not so fast, max speed is about 90-100 MPH)

So let’s start with why I plan this and what I want to address/achieve:

1.   Issue with either camshaft or valve rocker or something else – so need to open valve cover as minimum, more details here http://www.sohc.co.uk/index.php/topic,23227.msg208693.html#msg208693. Along with that I want to replace valve cover by new type, that have fixed rocker arm shafts. But need to find it first. Along with that of course new gasket.. Optionally, if it turns out that camshaft needs to be replaced, I’ll try to find one with improved torque or one from CB650. And of course rockers if replacement needed

2.   Rattling noise @idle coming from head-cylinders (pushing clutch makes just little difference). I’ll make video and post it here, maybe you know that noise and its route cause. Bike idles well, ign. set properly, carbs synced

3.   Cam chain replacement

4.   If head will come off – complete head work – cleaning, valve checks, eventually new valve guides, seals, check for flatness / milling … simply taking opportunity that head is off, check/replace all needed. All gaskets / O-ring / seals replacement. Check/replacement of tensioner

5.   If cylinders will come off – replacement of piston rings. I expect bores & pistons will be OK

6.   Splitting cases is big question now – I’d like to fix shifting issue, but still hope this could be caused by mechanism under clutch (?) http://www.sohc.co.uk/index.php/topic,19775.msg175185.html#msg175185 On the other hand side, having cylinders off, maybe it is good idea to replace all seals, primary chain and check gearbox (?)

Now first questions – before I pull engine and start stripping, any advice what I should do before?

I’m thinking about:
-   leak test (to estimate rings / head status to be confirmed when removed)
-   redo compression test to have reference for comparison after rebuild. Last measurement was: dry: 120/120/110/130 psi, wet (teaspoon oil into each cylinder) : 150/150/145/145 psi
-   detailed inspection of clutch and shifting mechanism under basket – maybe after that case splitting not necessary (?)

Any thoughts / ideas / advices what else I should do before pulling engine / stripping?

15
CB500/550 / Camshaft identification
« on: September 02, 2020, 11:07:53 PM »
I'm considering buying this camshaft.
Can somebody confirm it is for CB500/500K (I need it for 550 k1)?
Seller says it is maybe race one (?)


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