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Topics - Paulreade

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1
CB750 / Drivetrain cover
« on: May 11, 2019, 09:24:23 AM »
I have noticed a crack on the top of the drivetrain cover and it's creeping so I don't want to re install it at present. Can this be repaired ( brazed/ welded) and polished out or am I looking for a replacement ?
Can anyone offer a solution ?
For avoidance of doubt it's the rear left hand cover secured with 2 screws on a k6
Regards
Paul

2
CB750 / Cb750k 6 carb bench sync
« on: May 05, 2019, 11:38:37 AM »
Hi guys.
Just inspecting the carbs before reinstalation. I have no 4 cylinder which is rich. I have looked at the slides and note that no 4 is slightly higher than the others, I assume therefore this is possibly why it's a tad rich ?. I will use the torch method to set, Q: is the adj made by the adj on the top of the carb.

Second point , my choke slides do not appear to move in sync. Nor do the slides on 2/3/4 retract fully ???? When the choke is open. Is this critical ( should all slides move in sync and open / close together for perfect operation ??)
Is there a paper / video available to watch ?
Regards paul

3
CB750 / Oil tank removal / cleaning
« on: January 15, 2019, 10:59:37 PM »
Hi guys
Have just changed the oil and filter on the k6 and just before I filled the oil tank I thought I'd have a look inside. There is around 6 mm of thick sludge in the bottom. None of this came out with the old oil so would have gone unnoticed had I not peeked in the actual tank. I proceeded to try and remove the tank until I noted a further feed / braided pipe at the rear which I could not get to ( obviously a feed and return pipe set up) So I re installed the tank and went ahead and filled it, with a view to doing another day.
I went on line and the only reference I could find with regard to its removal was to 'take the engine out' which appears a little drastic.
Has anyone removed it without too much of a strip down for a clean. Has anyone had any issues with the sludge - guess what I am asking is should I ensure its clean before I run it again. I'm sure this sludge has been in the tank for a while and it does not seem to have caused any issues to date , but thought I should get a second opinion on the matter ?
Regards
Paul

4
CB750 / Cb750k6 clutch disc query
« on: December 21, 2018, 08:55:18 AM »
Hi guys, I'm after a bit of advice. I have just stripped the clutch down and have 7 friction plates  ( existing) 6 of which have perpendicular grooves and the outer disc with the wider tabs has grooves or swirls running out at approx 45 deg. The replacement plates (7 no) all have grooves running out at 45 deg. When looking  at the basket from the right hand side of the bike does the basket / clutch spin clockwise ?. If so do the discs fit as per sketch B ?- this would mean the discs would be facing you as shown when inserted into the basket.  I assume this is the case as this would allow oil to be thrown away from the plates more easily ?. It's the first clutch I have ever stripped so just want to ensure its put back correctly.d The manuals simply do not show this level of detail that I can see.
Look forward to any pointers / advice / decent YouTube links etc.
Paul
Ps the picture C indicates the pattern of the grooves on the 6 discs removed. The 7th outer disc is similar to B.

5
CB750 / Cb750 clutch replacement
« on: September 05, 2018, 05:56:16 PM »
I've never replaced a clutch on a motorcycle but I need to do mine on the k6. I'm relatively ok at a DIY mechanics level - is it a relatively simple job to do, is there anything I need to watch out for. I will seek guidance from YouTube etc before I start and read the text available on line. I'm going to change the oil at the same time so I assume once drained I can set the bike on its centre stand rather than the side stand to prevent any seepage ??????
The clutch is almost at the extent of the lever being entirely out ( even with proper adj) and it clatters like hell when the clutch lever is out on tickover, so I'm hoping I will get some improvement when complete. I may have to check the carb balancing to ease some of the clatter as I believe that is generally the cause ?

6
CB750 / Cb750 spindle clamps
« on: September 04, 2018, 08:17:24 AM »
2 questions:
1. Refitting the spindle clamps am I right in thinking you fit them with the 'f' mark to the front , slightly thicker side, and clamp this up tight, then tighten the rear bolt to clamp the spindle. I cannot find the torque settings does anyone know what they are, it appears to be an8mm bolt ? Would around 18 lb ft be ok ?

2. Anyone know of a party that might offer an opinion or actually 're true' spoke wheels in the stockport/ high peak areas ?

Cheers
Paul

7
CB750 / Fork Spring / oil
« on: June 23, 2018, 02:24:43 PM »
Hi guys, working through a process of elimination to remove a hop or bob out of my k6 front forks. I will attempt to ensure wheels are true and steering head tight in due course. I will then probably try a thicker oil first before replacing springs.
Q: if I remove the springs - is there a way of checking if they actually need replacing or is it just worth doing due to the age of the bike ?
Q: David silver do not stock any longer - I have located progressive springs that may be available via Hagon - is this the best outlet ?
Q: I believe I have 10w oil in there at present, might it be worth draining and trying a slightly thicker oil before a spring change to say 15w or even 20w. I'm only around 11-12 stone so I don't want to stiffen it too much as I believe some of the thicker oils are needed for a heavier load ?
Any advice welcome
Regards
Paul

8
CB750 / Suspension - hop.
« on: June 13, 2018, 06:30:14 PM »
My k6 up to around 50 mph had a rather uncomfortable feel through the handlebars to the extent you couldn't ride one handed.  After 50 mph it more or less disappeared but not entirely. The yolk nuts I thought were first to blame as they were loose. I re torqued everything up but it remained. I jacked the front wheel up yesterday ( new rims and spokes) and found the wheel had a flat spot ( in the vertical for almost half of the tyre ) and a slight offset ( left to right.). I have more or less corrected this but need a final tweak when I get hold of a torque wrench. If a slight bounce still remains do I put this down to the bike being 42 years old ( spoilt with modern damped suspension) or could I damp it anyway with thicker oil for example ? Any ideas ?

9
CB750 / Mechanical know how
« on: June 13, 2018, 09:08:30 AM »
Hi, I recently purchased a k6 (cb750) - I have a few questions I would like to put to a knowledgable owner. Ideally I would like to meet up with someone in the north west of the U.K. To have a chat ?. Perhaps a meet for a coffee. I want someone to listen to the bike and guide me on certain mechanical issues ?. Any help would be appreciated.
Regards
Paul

10
New Member Introductions / New member
« on: March 12, 2018, 08:35:53 AM »
Hi, have been riding for near on 48 years ( started young) and have ridden Japanese bikes with the exception on a greeves / dot scrambler and my current 865 T100 bonneville all my riding life. I have owned a few honda's the largest being a 75 Honda cb500/4. I currently ride a Suzuki GSX 1250 FA for touring and a triumph T100. I am looking to source now a very clean Honda CB 750/4 k series to add to my current bikes. I live in the NW of the U.K. ( unfortunately) and hanker for a life on the continent ( each and every day I wake and look out of the window and ride our pathetic road network ). So I look forward to meeting current members at some point. I have already received some valuable advice on ownership from A few current members which has been encouraging. Good to be aboard.

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