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CB750K2 - Identifying Parts
Biggles07:
Hi all, I recently purchased a nice, fairly un-restored UK CB750K2 in gold. But it has some features that I either can't reconcile or don't understand. I'm wondering if the gurus out there can help:
1. I've had the carbs done but I have 2 pipes coming form the mid-line of the assembly that I don't understand. See pic. I'd love to know what there're for!
2. My left fork ear has a square hole in it. Its empty - what's it for?
3. The L/H switch gear has an additional momentary press button mounted underneath the assembly. It is not wired to anything. Again, anyone know what it's for?
4. The bike has 'UK-style' lower handlebars (which I like) but the cables are clearly intended for the higher US-style bars. I've sourced shorter throttle cables, but the shorter upper brake hose is eluding me. Any ideas on the precise part number and possible sources?
5. Finally, the PO spray-painted the engine cases and cylinders silver in-situ (small over-spray evident). What was the original state of the barrels & cases? Painted or plain aluminium?
Very grateful for any help with this. Thanks in advance, Simon
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JamesH:
--- Quote from: Biggles07 on March 14, 2022, 12:52:03 PM ---Hi all, I recently purchased a nice, fairly un-restored UK CB750K2 in gold. But it has some features that I either can't reconcile or don't understand. I'm wondering if the gurus out there can help:
1. I've had the carbs done but I have 2 pipes coming form the mid-line of the assembly that I don't understand. See pic. I'd love to know what there're for!
2. My left fork ear has a square hole in it. Its empty - what's it for?
3. The L/H switch gear has an additional momentary press button mounted underneath the assembly. It is not wired to anything. Again, anyone know what it's for?
4. The bike has 'UK-style' lower handlebars (which I like) but the cables are clearly intended for the higher US-style bars. I've sourced shorter throttle cables, but the shorter upper brake hose is eluding me. Any ideas on the precise part number and possible sources?
5. Finally, the PO spray-painted the engine cases and cylinders silver in-situ (small over-spray evident). What was the original state of the barrels & cases? Painted or plain aluminium?
Very grateful for any help with this. Thanks in advance, Simon
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--- End quote ---
Hi Simon - I may be able to answer some of these..
1) Mid-line pipes are vents for the fuel bowls (they vent to atmosphere). They run from small elbows that fit into no 2 & 3 carbs bodies, and exit up over the top of the air filter.
2) Square hole if for the rubber moulding that holds the US spec 'buzzer' unit - which most people discard (I suspect your's is long gone, hence the vacant hole)
3) LH switch 'underslung' button is to silence the item in #2 above lol - just leave it disconnected.
4) A UK spec CB400F upper hose does the trick - DSS sell pattern parts here: https://www.davidsilverspares.co.uk/CB400F-SUPER-SPORT-FOUR/part_189733/
5) Engine cases would have ben painted 'cloud silver' by Honda from the factory.
James
Biggles07:
James, thank you so much. Very helpful. Interesting that my bike (which is definitely a UK machine registered in July 73 in Hull) has what appears to be US spec parts. Still, after 49 years its maybe not surprising! Someone has definitely changed stuff at the front end over time. I'm going to gradually get it back to original, but riding it is more important as the weather improves! :) Thanks again, Simon
Nurse Julie:
Welcome to the forum Simon. I'm away at the moment but if you need any up close and personal photos of UK K2's, just shout as I have a couple at home.
Biggles07:
Thank you Julie.
Supplemental re Cloud Silver for engine cases: what sort of paint should one use (I'm thinking that a VHT paint might be best?), and are there any tips on sourcing it and the best method of applying it?
Again many thanks in anticipation.
Cheers Simon
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