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Messages - K2-K6

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The Black Bomber Board / Re: Bomber crank refurb
« on: Today at 11:24:47 AM »
The "crud" I believe comes from effectively taking the oil over temperature locally to bake it in a sticky mollasses type looking residue.

It's something that newer oils are able to avoid and with significant benefit to running things like this.  I don't prescribe to the "old engine, old oil" theory if it can't be proven with good logic why that should be the case.  The so called "synthetic" oils available have very significant advances in this area, susceptibility to heat damage, that just don't compromise in this way. 

From various engines and where this effect is clear, it's usually accumulated at over heat sites rather than pure restrictions.  In other words, temperature within crank components rather than just accumulation of junk getting stuck there.

The Black Bomber Board / Re: Bomber crank refurb
« on: Today at 09:19:33 AM »
Apologies for thread drift Ash

What an amazing process.

The Black Bomber Board / Re: Bomber crank refurb
« on: Today at 09:01:50 AM »
Think he has some help with setting up the crankshaft alignment by employing miniature engineers.


What is it? / Re: Does anybody know what this hub is from?
« on: March 06, 2021, 06:14:04 PM »
Looks like an xr 125 or similar.

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There's quite distinct ribs cast into those that looks familiar.

CB500/550 / Re: CB550 strip
« on: March 06, 2021, 04:49:59 PM »
A bit blurred to see critical detail, but first impression is that it looks pretty good judging by the wear patterns.

Misc / Open / Re: Gas fire gasket
« on: March 06, 2021, 04:31:54 PM »
Have you tried syncing the carbs?  ;D

Same as you found,  can't see any parts list in searches at all.

Other Bikes / Re: Kawasaki Z400J1 Restoration
« on: March 05, 2021, 09:45:34 PM »
Looks that they've done a nice job there Dave.

Like the sheep in the background too  :)

Also think the cast wheels on these are some of the best looking of the manufacturer kit of that era,  believe they are Morris mag copies.

Before splitting (too late perhaps) I like to clean the outside of the engine to avoid getting grit etc into the components and interior.

Possibly of more relevance if it's a quick split,  change chains etc then back together rather than absolute disassembly in total.

Other Bikes / Re: A cb360 side panel repair?
« on: March 05, 2021, 09:52:50 AM »
This one, from off the telly  :) was quite interesting

Looks drastic, but effective. 

You can see the difference in the brochure figures with the F2 set to make it's BHP peak 500rpm higher than the K3.

You'd guess that the K3 intended use would be more accommodating of higher gear roll on throttle use,  rather than changing down and revving the motor, longer intake will help this. But it may give more and louder intake resonance (noisier when making wider throttle opening at lower revs ) which they've trimmed by altering the air filter.  A noise baffle in other words.

It's likely that the filters will flow exactly the same air mass but one would make more noise , sportier? and welcome on a more enthusiastically ridden bike,  but literally a pain if you want to tour around on long serene journeys. 

Honda were then absolute masters of intake tuning and show many minor tweaks to get things working how they wanted.

You could also view it as putting a very slight suppression "flat spot" into the F2 that gives more of a kick as it reaches that higher peak, and so give more of a sporting feel that matches with the lowered gearing.

Thanks Oddjob, I wondered if it possibly had to do with the K3's longer rubber boots (or is 'runners' the word?). As for the wider and smaller opening, clearly traders are lost...

Longer rubber "bellmouth" ? is to influence lower rpm more than higher range.

The carbs, 4 pipe exhaust and intake would seem to be setup with torque at lower rpm in comparison to the F model that would expect to be ridden at generally higher range. Is the gearing different between the two?

The Black Bomber Board / Re: Bomber crank refurb
« on: March 04, 2021, 05:47:30 PM »
He's done a beautiful job on that crank Ash, a real credit to him.

We forgot that in our ramblings  :) it does look particularly good work Ash.

Strictly speaking DK have done nothing wrong. You have the same consumer rights buying used and new. You could have exchanged the crank or sent it back for a refund. DK offered to replace the crank rods and that was declined. They are under no obligation to do a partial refund. Could they have handled it better? Probably. Do they have to? No.

I'd see it the same. They supplied 40 year old component with potential to have something wrong,  when notified they offered to replace the affected parts to make sure it met the description.  Ok, a bit of a pain that the rod was damaged, but they fully intend to place the customer into the position they were when starting the transaction.  That's difficult to argue with from a legal perspective. 

I've also been on the other side of the transaction in responding to customer complaints. A notable one of which had the customer take us to court after some extreme efforts of the company to resolve the problem.  It was found that the customer although technically right, had not taken all of the offers made to them but still proceeded in legal pursuit to demonstrate to the "company" that they are not to be messed with.  Questioned about the price the customer had paid, it amounted to something like £11.60 which they where awarded. Costs for each side were their own  :o which was quite a sobering experience for them.

CB350/400 / Re: Fork springs
« on: March 03, 2021, 08:26:10 PM »
I'd initially change the oil too. 

ATF is fine and not expensive,  but feel that a dedicated fork oil holds advantage and makes the fork action smoother.  Over about 10 viscosity usually makes them quite harsh.

Preference for me is Motul fork oil in 7.5 grade but they do others too.

The Black Bomber Board / Re: Bomber crank refurb
« on: March 03, 2021, 05:33:23 PM »
Notice he pinned the journals too, to prevent them rotating under torque load.

The original Honda apparently can't be loaded at to low an rpm to reduce the risk of twisting them out of phase, with the rev counter staring at something like 8000rpm ! And useable range above 14000rpm.

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