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Messages - K2-K6
16
« on: April 12, 2024, 08:55:16 PM »
From the plug colour it does seem like its possibly rich enough to knock the edge off response and crispy-ness. Worthwhile turning the idle adjust screws out half turn ...... to judge if there's significant change or not .... as experiment and investigate evaluation. Quick and easy to assess effect, free too 
17
« on: April 12, 2024, 01:38:31 PM »
As a point of interest Mo, which spark plug type are you using in this engine ? The whole designated sequence that is.
18
« on: April 11, 2024, 08:17:24 PM »
One coil only runs cylinders 1 & 4 with the other coil running the 2 & 3 pair.
Easy to quick check, no numbers needed.
Another easy test, if you've any e-z-start or brake cleaner, you can put a little squirt into the cylinder via it's sync port while its running to see if that pot will chime in, obviously then indicates fuel absent on that one.
19
« on: April 11, 2024, 11:32:07 AM »
You could have made some nice one's out of Mrs K's favourite cardigan after I washed it at the wrong temperature And her bobble hat too 
20
« on: April 10, 2024, 05:12:56 PM »
 bonus. Certainly worth talking it through with him, may be able to help out.
21
« on: April 10, 2024, 01:36:08 PM »
The type of place that would do them to spec is a clock repair business, it's sized right in their trade and experience.
They could likely and easily manufacture a set to spec too from simple brass stock in a small collet lathe. They're often making bushes (very similar in size) to repair old clock plates that have worn spindle holes. All reamed to accurate size in matching the tight tolerance needed.
Set of four aren't really much work in total labour time.
Could be an avenue to explore, perhaps if someone else needed some decent quality too.
22
« on: April 10, 2024, 12:55:04 PM »
Yes to ad hoc firing. The coils, two leads ordinarily yellow & blue are down to points to give switching and timing, all left as normal. The other two wires to coil are the supply of positive voltage to power the whole system. Just give them the 12v supply and it'll be live. Make sure you can easily disconnect (crocodile clip ?) In case you need quick shutdown
24
« on: April 09, 2024, 11:55:13 AM »
56 TPI equal to 0.454mm (0.45357) in possibly a Witworth thread form of included angle 55 deg seems to be somewhat in the ball-park for thread type Whitworth quite a possible form as date of record likely fed into bicycle std manufacture, with pitch rather than ultimate other decider to give characteristic tensioning effect that's consistent for X number degree of tightening turn to load the spokes. Thread pitch desirable regardless of spoke gauge would seem logical to wheel building, and so giving likely hybrid to the thread form used, even today.
25
« on: April 07, 2024, 09:29:29 AM »
Was a really good day out last time there.
Meeting others from forum, great bikes, very interesting museum, different bikes running etc. Will plan to get there again for this one.
Also walked out along nearby coast, excellent Fish-n-Chips down by the beach in Aldborough before heading home to finish a great day out.
26
« on: April 06, 2024, 02:33:35 PM »
Tentatively, looks like it may have the unique to F2 oil cooler plate behind filter housing (can't quite see in picture) which could mean F2 bottom end, or fitted to replacement engine as it's just a longer bolt used. Engine number will show case type anyway.
Top "shelf" of head fins look more like K series as the F2 extended out more toward front wheelmin giving more cooling to exhaust port area.
As Bryan notes, could be K top onto F2 bottom end .... or K painted black to look like F2 original.
27
« on: April 05, 2024, 07:43:40 PM »
Any picture of wheel and hub to give idea of model ? Likely that the CB650 was a swap in for original fitment, size parity of model. That seems to agree with your 160 x 40 mm dimension and listed some places as "321" code. https://www.squaremotorcycleparts.co.uk/products/rear-brake-shoes-honda-cb650-cb-650-1983-1985Is the whole brake "track" in the drum obviously used, or perhaps you can see a narrower band of witness mark if too narrow a shoe has been installed.
28
« on: April 05, 2024, 06:12:48 PM »
Looks full F2 rolling chassis etc, but motor appears previous to the F2 original.
Seems to have something like a Suzuki GS 750 type instrument binnacle though.
29
« on: April 05, 2024, 09:14:59 AM »
I spotted this oil temperature gauge for the CB400F on the Yamiya site, if my guess is correct it fits where the dipstick otherwise would sit. Has anyone got one, is it worth investing in? https://www.yamiya750.com/index.php?main_page=product_info&cPath=179_281&products_id=4119
Interesting to see what oil temperature is running at, but with no effect if you're not going to take any actions to change it. Engine should run at 90C generally, but if too low temperature, winter for example being lower ambient (no thermostat on air cooled bikes) then a thinner oil viscosity could be appropriate, yes even with multigrade. Honda data says ambient below 15C then 20 viscosity is suitable. If for example you, due to ambient and circumstances reliably saw 100C plus oil temps, then additional cooling and/or raised viscosity may be appropriate. The 40 viscosity in "general" use oil recommended does actually cover that 100C scenario for high ambient temperature running. A temperature logging ability would be of more use in tracking and diagnostic analysis than a gauge.
30
« on: April 04, 2024, 05:21:21 PM »
They make "supplementary" switching kits, much like Hondaman type unit, this to take triggering from points and then switch load to coils by solid state circuitry. Unsure if that's what is meant in enquiry .... If that's the case, it looks reasonable, but would need a field test pilot to give us a view of practicals here on the forum.
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