1975 CB750 P2 Police Bike

[Bryanj]

The triumph t160 cardinals never got to saudi as they cancelled the order, a high percentage had gearbox problems with wrong hardening on layshaft bearings

[JamesH]

Minor progress today on the wiring loom. The existing loom was beyond repair, so I decided to modify an OEM K5 loom to serve as the basis for the replacement loom.

The only difference I could find between the stock loom and P2 (‘75) original loom was the provision of a switched positive feed that runs the entire length of the loom front-back and T’s into the ignition switch (where it gets it’s switched feed from). The simplest solution was to cut this out from the old loom and ‘graft’ into the new loom.

The P2 loom also uses a square connector for the unique police ignition switch (which has 4 positions). This has 5 rather than 4 terminals in the loom—>ignition switch plug (the 5th is the additional switched positive feed which is a red wire with a white band at each breakout point).

I’ve also been searching for weeks for some OEM silver-grey glossy PVC harness sheathing in 18-20mm ID for the headstock end of the loom. The seller in the US only has up to 12mm ID. In the end I gave up as I need the loom in the next couple of weeks as the build accelerates.

So I’ve had to think laterally/innovate a bit here with silver-grey PVC heat-shrink, which luckily turned out pretty well.

Overall was a 2-3 hour conversion process. Photos should tell the story.

The original P2 loom:






Testing the PVC heat shrink on the old loom:






Replacing the ignition switch 4-pin round connector with the original P2 5-pin spade/square connector:








Applying the silver-great heat stink on the replacement loom:






The finished loom, complete with original (faded) P2 label:

[Oddjob]

Saw a on/off switch for the police lights today on Ebay.

Presume you don't need it. If not it's on there.

[JamesH]

Saw a on/off switch for the police lights today on Ebay.

Presume you don't need it. If not it's on there.

Thanks Ken. If it’s the switch that mounts to the headlight bucket/nacelle I’ve got a NOS one thanks. Have a link?


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[Lobo]

As always, amazing James. Who tho’ will be a likely buyer; can you use this on the roads? (Or would a museum likely buy it?)

Here in Brisbane, and only a couple of miles away this has been on Gumtree for a while now; a stalled project it seems… (£3650 ‘ish)

https://www.gumtree.com.au/s-ad/upper-coomera/motorcycles/honda-cb750-k7-police-bike/1285799984

[royhall]

Nice attention to detail James. These are the time consuming fiddly bit's that nobody ever sees, but make all the difference to the finished bike.

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[Oddjob]

Saw a on/off switch for the police lights today on Ebay.

Presume you don't need it. If not it's on there.

Thanks Ken. If it’s the switch that mounts to the headlight bucket/nacelle I’ve got a NOS one thanks. Have a link?


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No it's like the handlebar switch the 500 uses for switching the lights on but I don't think it's one of those as the wire colours are wrong IIRC

https://www.ebay.co.uk/itm/224548038637?hash=item34481b27ed:g:A3QAAOSwzj5g~qPX

Not sure if it's for your model police bike or some other model. Thought of you straight away.

[JamesH]

Saw a on/off switch for the police lights today on Ebay.

Presume you don't need it. If not it's on there.

Thanks Ken. If it’s the switch that mounts to the headlight bucket/nacelle I’ve got a NOS one thanks. Have a link?


Sent from my iPhone using Tapatalk Pro

No it's like the handlebar switch the 500 uses for switching the lights on but I don't think it's one of those as the wire colours are wrong IIRC

https://www.ebay.co.uk/itm/224548038637?hash=item34481b27ed:g:A3QAAOSwzj5g~qPX

Not sure if it's for your model police bike or some other model. Thought of you straight away.

Thanks Ken. The patrol light switching is dealt with on the handlebar switch on the P2 model I think. I’ve not really studied the wiring in huge detail yet.

I think the switch you linked to is for a 550/750K (78) police model.

[JamesH]

Well, I been thinking about this day for 3-4 years now, and finally have the engine back in the frame. She literally slotted into place perfectly - the easiest ‘re-insertion’ of a 750 engine I’ve ever had.

Luckily I had a new points cover in my stock pile - just checked the DSS price and (drum roll) - £360. Yes, £360. 3. 6. 0. British pounds. What the f*** is going on there..?

It turns out the NOS foot pegs came out of the sale of John Wyatt’s estate, via a nice chap who is helping Johns widow sell off his bike related stuff and doing so in a really fair, ethical and transparent way which is a nice touch. Thanks John for keeping hold of these over the years

Anyway, have made the progress I wanted this week - having a week off next week - so next update will be the following week.

Obligatory progress photos below…

[Laverdaroo]

Absolute stunner, well done James, thats really coming together beautifully.

[Laverda Dave]

Fantastic work as always James and I think John would be proud that some of his spares stash has gone on to be fitted to a bike worthy of them.
I'm glad you are having a week off, the speed of this restoration has given me a nose bleed😉.
Enjoy your week off🍺

[AshimotoK0]

Fantastic work as always James and I think John would be proud

And DaveA      would be proud too!

Yea stonking good progress James ... is Tuesday night ..resto night for you !...  like it for myself and BenPowell? We have our Tuesday night resto club at work (where we have bead blaster, mill, lathes etc.) . I named it "WHAM!"  Water Hydraulics Association of Motorbikers 

[Johnny4428]

Must just add to this and say absolutely lovely looking resto so far James! Like the idea of the “WHAM” nights Ash!

[Oddjob]

James I have some stainless steel screws with captive washers to replace those on the points plate if you want some.

[Laverdaroo]

Dont know if you can gleen any info from the brief clip but just saw this on you tube.....


https://www.youtube.com/watch?v=AJSSP4_WldU&list=WL&index=24