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Messages - Erny

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1
mine goes back to top of the battery area

2
CB500/550 / Re: 550 K1 : up-shifting issues (mostly low RPMs)
« on: April 13, 2023, 11:02:34 AM »
Thanks Bryan for this confirmation. Hope story is over now ;)

3
CB500/550 / Re: 550 K1 : up-shifting issues (mostly low RPMs)
« on: April 11, 2023, 10:34:43 PM »
Just to give you the update on this

Since last post I ordered few parts:
- shift drum stopper, neutral stopper and stopper cam plate replaced by new ones
- new clutch springs
- basket filed
- basket play adjusted (thanks to Oddjob's shim set!)
- assembled, new oil, filter etc

I did not do anything with dampers in clutch basket - I'll keep that for later (winter job, highly likely engine to be opened anyway for primary chain replacement at least)

First ride : up-shifting issue is still there, but I feel it less happening / reduced.

When testing shifting mechanism before assembly clutch and cover (with new replaced parts) I did this video to show the issue that I feel during shifting - when up-shifting, I usually cannot change gear unless I turn gearbox. Down-shift is always w/o issue. It is clearly visible in the video that when up-shifting, movement of gear drum is "stuck" in the midway and moves more when I turn gear (clutch basket shaft). This is exactly what I'm referring as my up-shifting issue.
https://youtube.com/shorts/G-AaCvEzcqE?feature=share

Question is if this is normal (so no more issue) or problem is in the gearbox itself? Maybe experts here (Bryan, Graham, Oddjob..) can comment?

4
CB750 / Re: Some Minor Issues to Sort
« on: April 11, 2023, 06:50:25 PM »
With regards to neutral switch - it can be also some unwanted connection of neutral switch wire to frame (ground). To check that disconnect wire from neutral switch, if control light is still on, look for wire issues, if not it is switch itself.

5
CB500/550 / Re: The Shiny Orange one
« on: April 11, 2023, 02:58:02 PM »
Beautiful bike Ian!!
Congratulation to putting her back on the road!

7
CB500/550 / Re: 550 K1 : up-shifting issues (mostly low RPMs)
« on: March 25, 2023, 11:33:51 AM »
With regards to basket axial play - just found that it is linked to collar length vs basket length - it is quite big to me (but maybe normal?). Only way to reduce it is to put shim under collar shoulder (between collar and basket), but Honda manual does not say a word about it, just mentions shims behind snap ring..

Any thoughts?

Video - I'm holding collar pushed firmly against engine - this is axial free play of basket (~0.7mm)

https://youtube.com/shorts/kOtujX2WB-I?feature=share

8
CB500/550 / Re: 550 K1 : up-shifting issues (mostly low RPMs)
« on: March 25, 2023, 09:20:18 AM »
The damping rubbers inside the basket look to be shot to me Erny. How do the towers look, where the tangs of the clutch plate sit are they still flat or are they showing ridges all up and down the towers.

Not sure on the gear selector wheel question, I'll need to compare with some of mine to see if mine do the same, never really looked at that before TBH.

I'd suggest looking for a replacement basket, new if possible. Or one that's got no play if not. Ask the seller to check.

Do the axial play when the new basket arrives.

I may have a 550 basket (not 500, they look the same but aren't) but it's the distance that kills it.

Hooks look ok. Have you checked the pins they engage with, might be a broken one.

As for the basket - It is 550 one, I'll do detailed inspection today again, except dampers play, to me clutch really looks OK.
As for dampers - my fried was replacing these dampers on his 650 SOHC engine (shall have similar ones, I guess), he drilled rivets out, one guy made rubbers (from some plastic material) for him and then he used bolts to close it. And it is working well (racing engine).

Main question is if such axial play (0.7mm) could cause my up-shifting issues? Or that gear selector wheel ...

Need to inspect pins too that bolt hooks are engaging but I do not expect issue as up-shifting issue is on all gears and shifting works smooth w/o using clutch, will report anyway.

9
CB500/550 / Re: 550 K1 : up-shifting issues (mostly low RPMs)
« on: March 24, 2023, 11:27:11 PM »
After some time, I finally opened cluch cover (was first one opening it, BTW). Note:  engine now has 19k miles from new
Winter was simply too cold to to motivate me doing it in cold garage, moreover I was lazy :D

Back to point - I tried to make few videos from my findings, please comment advice what is/can be wrong with regards to my up-shifting problem and clutch snatch/kick:

1. Clutch basket has serious axial play, I measured approx 0.7mm https://youtube.com/shorts/_LvZtXY1b3Y?feature=share and https://youtube.com/watch?v=o-TgZ4Vp3Ms&feature=share
2. Hooks on gear change mechanism seems to me Ok, see photos
3. Gear mechanism (wheel on shift drum stop?) has significant play but only in one direction, see https://youtube.com/shorts/Y626xFgk51w?feature=share - is that OK/normal?
4. Large drive gear is moving vs clutch basket, seems internal dumer rubbers are shot (can this cause clutch snatch/kick?) https://youtube.com/shorts/W4neSdbf_I4?feature=share

Other findings:
- clutch plates looks as new (friction ones has 2.68mm), no mechanical wear visible
- clutch collar and clutch basket bushing looks OK to me, but basket has some play (~0.3mm at the edge when trying to move left-right, up-down)

As I have shims from Ken, I can to fix axial play of basket.
Shall I replace damper rubbers too? If so, where to get them? What about shift drum stop wheel?

Any other ideas what I can check/do else?

My priority is to fix up-shifting issue..

Thanks

10
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

11
CB750 / Re: Spark Plug
« on: March 13, 2023, 10:16:02 PM »
Which Denso plugs? X-24ES?

24's are fine on a 750 sohc  ;)

What is DENSO alternative for 500/550?

DENSO is not copied as NGK?

12
CB750 / Re: Spark Plug
« on: March 13, 2023, 07:14:10 PM »
What I know, that R really means resistor, but not 100% sure. And running resistor plugs with resistor caps is definitely not OK.

You can confirm if plugs have resistor by measuring them with multimeter

13
Misc / Open / Re: General part number decipher
« on: February 26, 2023, 08:03:01 PM »
Very interesting and valuable info, thanks for sharing!

14
CB500/550 / Re: Paint
« on: February 22, 2023, 11:52:43 PM »
I think trick to avoid extra fees can be to declare it as "repair', but I'm sure there is someone who have better view...

15
CB500/550 / Re: Are these a Bargain?
« on: January 13, 2023, 09:16:23 AM »
Red one seems to be replica made in India (?) - look at the picture showing bottom - welds around petcock entrace (by the way I think incorrect)...

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