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1975 CB750 P2 Police Bike

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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:

--- Quote from: Oddjob on January 29, 2022, 08:17:32 PM ---Saw a on/off switch for the police lights today on Ebay.

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

--- End quote ---
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

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

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