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Messages - K2-K6

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3196
CB750 / Re: Torque settings
« on: December 31, 2018, 02:34:37 PM »
If you do the sump bolt to 32.5, you will be looking for a new sump pan  :o And 86 on the flywheel bolt  >:(

That is weirdly high for the sump bolt isn't it.  Don't think I'd get anywhere near that.

Something in those numbers as well ( for sump drain bolt)  the range from bottom number to top number increases, by getting close to,  50% over and above the lower number.  That just can't be right.

Someone recently asked me if I could account for the range of torque settings specifically quoted for the 750 engine, for which I couldn't come up with a competent answer.

I've studied (decent time ago)  how torque stretches studs, compresses thread pitch in nuts etc,  looked at elongation of tensioned studs, stretched materials through yeald point and so on,  but just can't see why they quote such a wide range rather than give a target.

If you add the range together with a error percentage for torque measuring device,  it could be miles apart from the reality.

3199
CB750 / Re: Cb750k6 clutch disc query
« on: December 30, 2018, 05:57:29 PM »
I think there's information that leads to conflicting opinion on this.

The Honda manual I have for 750 F2 is very specific in stating that the angled slot plate should be fitted as picture B in your early post.  it also has the double plate fitted to centre clutch pack.

As far as I'm aware the angle is there to manage oil dissipation as the clutch is released and so will affect the bite "feel" and how smooth the initial drive takeup is. It doesn't look like it will cause a problem as such when fitted either way, but it should change the operation in a small way but only for pulling away from a standstill.

If you look at how the clutch operates,  engine running,  clutch open, in first gear.  Then the metal places are stationary with the fibre plates rotating with the crank, and oil between each interlayer.
As you bring the clutch toward closing then it has to squeegee the oil out of the layers to gain traction and start to rotate the metal plates. This is then driving torque through the gearbox.

As the plate with the angle slots is approached by the flat plates either side of it, the oil has to be wiped into the slot for its exit route out of the clutch pack. If the slots face forward (as in A) then it has the effect of working against centrifuge, which keeps the oil in play longer, which gives a softer clutch bite. 
In the B plate scenario,  the oil is less retained against centrifuge,  so should give a quicker bite transition,  and potentially more difficult to modulate torque takeup.

They both don't seem technically wrong but should give subtly different initial affects.

I doubt that the affect is aimed at moving geachanges as all of the clutch pack is moving together after initial pull away. 

If you don't like the effect when installed, then it's easy to flip the plate.  It's more fine tuning by designers than any technical disaster if it's fitted backward.

3200
CB750 / Re: Service History Record?
« on: December 30, 2018, 04:06:45 PM »
It's got "check centrifugal oil filter" in the schedule,  so at a guess that may push it toward the twins of a certain age range.

3201
CB500/550 / Re: 500 ride again project
« on: December 30, 2018, 09:30:33 AM »
The dog drive looks like it's been spitting back out from the look of the radius on those drive faces.

You need to compare them with a known good set to see how much they are worn. But they don't look disposed to staying in place under load. Don't think you could rely is on them even if everything else wash perfect.

If under load it's trying to separate the dogs it will heat up the selector fork as it'll be "leaning" on it which it's not supposed to do.

Is that back dog of the three sticking up a different size to the others? Can't get a good view of it in the photo, and is it supposed to be?

3202
New Member Introductions / Re: Honda ss50
« on: December 29, 2018, 11:24:44 AM »
Can't help with useful knowledge on that model.

But you should get someone like Hairygit along soon who has much more extensive experience with those little engines to help you.

Welcome to the forum Hoss.  :)

3203
New Member Introductions / Re: New Member
« on: December 28, 2018, 03:53:40 PM »
Welcome to the forum Bradders.

Worth a chat with the people at Hatfields Crowthorne to get their perspective. A friend and his son have both been recent customers there with contemporary Honda bikes but say it's a very classic type dealer, it'll at least give you a local pointer if they are interested.

It's a long time since I've been in there but they were my local bicycle shop prior to motorcycling  :) they've always been pretty practical and friendly.  I grew up in Sandhurst just a couple of miles away.

3204
Well we can piece together from general information bandied about that God does in fact live in Yorkshire as people from that county do claim "it's God's own county" so no mystery there.

Also, it's claimed, he rides a Harley Davidson.  So the picture builds.

I'd guess rom Hare-Crishna corporate colours, that he must ride a KTM  :) a fine choice but picked the wrong forum.

So we cam probably cobble together a profile for the OP.

3205
CB750 / Re: Honda 950ss
« on: December 19, 2018, 08:04:59 PM »

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One of the principle Honda dealers/Concessions in France since 1966.

They made alot of specials based on CB750 and competed in endurance racing with various specs.

Think the proprietor appears in the photos on the pre-production 750 launch in Paris. Can't remember his name though.

3206
CB750 / Re: CB750/4 water damage to pistons
« on: December 17, 2018, 04:17:58 PM »
The taper shape of wear on the top ring lands shows its been running with the ring getting progressively more movement.

If it had been corroded to the bore and snapped when it was tapped down the cylinder to get it free,  then the piston material would just snap off without any wear pattern. The wear is there without the top surface of the piston being displaced above the taper region, so material missing next to the ring with piston crown still in place.

Detonation craters visible with molten edges on the piston crown.

3207
CB750 / Re: CB750/4 water damage to pistons
« on: December 17, 2018, 03:44:59 PM »
What do you think then Julie?

I bet you can guess my view  :D

3208
CB750 / Re: CB750/4 water damage to pistons
« on: December 17, 2018, 12:16:32 PM »
Wow, that's really far gone.

Be interesting to see the top of that piston on the combustion face. If it's just been damaged by corrosion and removing the barrels then it should have no other signature of damage if it's not been run after the event.

3209
Misc / Open / Re: Does this look like Candy Gold Custom to you?
« on: December 17, 2018, 09:45:58 AM »
And comparison to original post

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Photographed in daylight though,  so no potential flash illuminance bias that may have been present in Hunt's example.


3210
Misc / Open / Re: Does this look like Candy Gold Custom to you?
« on: December 17, 2018, 09:08:30 AM »
Someone's dressing them up to make a more classic look. The form is nobbled by that engine being so tall though,  it dominates the whole layout compared to SOHC which is much shorter.

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https://thekneeslider.com/an-update-on-the-cb1100-four-k10-kit-for-the-retro-cb750-look-from-whitehouse/

More colours on this site.


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